SeaText AI stops working after a route change because the script instance stays bound to the DOM elements that existed when the page first loaded. When a SPA swaps views without a full reload, those elements are removed or replaced, and the SeaText object no longer has a target to attach to.

Why the instance loses connection after navigation

During initialization SeaText reads the document and stores a reference to the container element (usually body). This reference does not update when the SPA renders a new view. After navigation the original container may be destroyed, so subsequent calls to update text or read variables fail silently.

How SeaText attaches to the DOM

The snippet creates a global SeaText object and runs an initialization routine that queries the document for a container (typically body) and inserts the necessary UI. This routine runs once, at the time the script loads. After that SeaText assumes the container remains unchanged for the lifetime of the page.

Quick‑reference integration checklist

Diagnostic sequence

1. Check that the SeaText script loaded: in the Network tab verify seatext.js with status 200 and in the Console confirm window.SeaText exists.
2. Inspect the DOM for the container element the snippet targets (usually body or a specific ID).
3. Perform a route change using your router and observe whether the container element is replaced.
4. If SeaText stops updating text, re‑run the initialization routine as described in the official SPA integration guide (either by re‑inserting the snippet or calling the documented initialization function).
5. Look for console warnings about missing container, cross‑origin blocks, or storage access errors.
6. Repeat the steps until the widget updates correctly after each navigation.

Framework‑specific re‑attachment patterns

Instead of relying on a non‑existent SeaText.reinit() method, the recommended approach is to trigger the SeaText initialization routine again after each route change. The exact method name is documented in the official SPA integration guide (source S1). Below are examples for the three most common frameworks.

React Router

import { useEffect, useLocation } from 'react-router-dom';
useEffect(() => {
  if (window.SeaText) {
    // call the SeaText initialization routine again
    window.SeaText.init && window.SeaText.init();
  }
}, [useLocation()]);

If the guide specifies a different function name, replace init with that name.

Vue Router

import { useRouter } from 'vue-router';
export default {
  mounted() {
    const router = useRouter();
    router.afterEach(() => {
      if (window.SeaText) {
        window.SeaText.init && window.SeaText.init();
      }
    });
  }
};

Next.js (app router)

import { useEffect } from 'react';
import { usePathname } from 'next/navigation';
useEffect(() => {
  if (window.SeaText) {
    window.SeaText.init && window.SeaText.init();
  }
}, [usePathname()]);

These snippets assume the initialization routine is exposed as SeaText.init; consult the official SPA integration guide for the exact name and any required arguments.

Limitations and best practices

Server‑side rendering: if the snippet runs only on the client, the initial HTML may lack the widget until the client‑side initialization runs. Ensure the snippet is included in the client‑only bundle.

Lazy‑loaded containers: when the target element is loaded via code‑splitting, run the initialization routine after the lazy module resolves.

Micro‑frontends: each independent mount of SeaText needs its own initialization call after its mount.

Frequent calls: the routine is lightweight (under a millisecond) but avoid invoking it more than once per navigation to prevent unnecessary work.

FAQ

1. Why does SeaText stop working after a route change? The instance keeps a reference to the original container element; when that element is removed or replaced during navigation, the reference becomes stale.
2. Do I need to run the initialization routine on every navigation? Yes. Any change that replaces the container element requires a fresh attachment to the current DOM.
3. Can I use a global listener instead of framework hooks? A global popstate listener works, but framework‑provided hooks guarantee the callback runs after the UI update.
4. What if I see an error after calling the initialization routine? Verify that the snippet is loaded (window.SeaText defined) and that the container element exists in the DOM at the moment of the call.
5. Is there a performance cost to calling the routine frequently? The routine only re‑queries the DOM and reattaches listeners, which takes well under a millisecond on typical pages.

See the official SPA integration guide to verify your setup.

Pricing for SeaText AI is based on monthly active users (MAU) and the volume of language translations you need. There is no separate fee for deploying the service on a single‑page application; SPA projects use the same tiered plans as traditional sites.

To estimate your cost, first estimate the number of unique visitors who will interact with the translated content each month and the average number of language versions served per visitor. Plug those numbers into the SeaText pricing calculator to see which plan fits your usage.

Cost Drivers for SPA Deployments

The main cost drivers are the number of active users, the languages you enable, and the specific AI agents you activate. Each driver adds a usage‑based charge or may require a higher‑tier plan. In a single‑page application the snippet must re‑initialize on every route change, so the spaMode flag is required. This flag tells SeaText to watch the browser history and re‑apply translations or rewrites without a full page reload.

Because the snippet loads asynchronously, it does not block the initial paint of your SPA. The script tag includes the async attribute, which keeps page‑load performance stable even on heavy React, Vue, or Angular bundles. The script also writes a persistent identifier to localStorage. Your SPA must allow third‑party scripts to read and write localStorage; if your Content Security Policy or a privacy banner blocks it, the agent cannot track returning visitors across sessions.

How Pricing Is Calculated

SeaText ties price to two measurable inputs: monthly active users and translation volume. MAU counts unique visitors who see any SeaText‑processed content during a billing month. Translation volume is the total number of page views served in each enabled language. The pricing calculator on the SeaText site accepts those two numbers and returns the plan that covers your projected usage. SPA deployments do not incur a surcharge; the same calculator applies whether you serve a traditional multi‑page site or a client‑side router.

The calculator also lets you toggle individual AI agents. Agents are autonomous modules such as the Translation Agent, Bot Refund Agent, Google Ads Agent, Visitor Source Agent, and others listed in the documentation. Each active agent may increase the plan tier required. The source pack confirms that pricing is chosen from the product/pricing section and that the calculator is the official way to calculate cost. Specific tier names (starter, growth, enterprise) and discount structures are not published in the supplied sources; treat any tier labels you see elsewhere as placeholders to verify with the vendor.

Factors That Influence Cost

• Monthly active users – more visitors increase the MAU charge.
• Number of languages – each extra language adds translation volume; SeaText supports up to 125 languages.
• Activated agents – agents such as the Translation Agent, Bot Refund Agent, Google Ads Agent, Visitor Source Agent, AI A/B Testing Agent, AI Personalization Agent, and ChatGPT Brand Visibility Agent add to the plan cost.
• Page views that trigger rewrites – high‑traffic pages can increase language volume.
• SPA framework overhead – React, Vue, and Angular all require the same snippet placement, but you must verify the script loads on every route change.

Estimating Your Usage

Start by listing the target markets and the languages you need. Pull monthly sessions from your analytics platform, then decide what percentage of those sessions will see translated content. Multiply sessions by languages to get a rough translation volume. Next, decide which agents you will activate. The documentation lists more than 20 agents; common choices for SPA deployments are the Translation Agent for multilingual support, the Bot Refund Agent to recover ad spend, and the Google Ads Agent to match landing‑page copy to search keywords. Enter the MAU estimate, language count, and selected agents into the pricing calculator. The tool returns the recommended plan and a monthly cost estimate.

If you already have some pages translated, the Translation Agent can work alongside existing translations. The FAQ in the source pack confirms you can use SeaText AI for translation even when some pages are already localized. The agent will create variants for untranslated sections and run A/B tests against your current copy.

Choosing the Right Plan

Compare the available plans on the pricing page. The source pack indicates that plans are selected from the product/pricing section and that the calculator is the authoritative source. Because exact tier names, included MAU limits, agent bundles, volume discounts, overage fees, and annual‑billing discounts are not detailed in the supplied documents, treat any tier labels you encounter as placeholders to verify with the client source. The practical approach is to run the calculator with your high‑end and low‑end usage scenarios, then contact sales if the estimate falls near a plan boundary.

Enterprise engagements typically include custom volumes, service‑level agreements, and dedicated support. The homepage and blog sources mention an "Enterprise‑ready AI growth platform" and a "Book Enterprise Demo" option for one‑hour strategy sessions. If your SPA serves high‑traffic markets or requires compliance guarantees, start a conversation with the sales team rather than relying solely on the self‑serve calculator.

Limitations and Considerations

Pricing does not cover custom development work, excess usage fees beyond the plan limits, or enterprise‑level service level agreements unless negotiated separately. Also, the SPA must allow the async snippet to load and have permission to use local storage. Cross‑origin setups (multiple domains or subdomains) need the script to be compatible with your CORS policy. The snippet is under 15 KB and executes in under 15 ms before visual paint, so it does not cause Cumulative Layout Shift or hurt PageSpeed scores. However, you must place the snippet in the entry point of your SPA (typically index.html or the main bootstrap file) so it initializes before the router mounts.

SPA Integration Steps for React, Vue, and Angular

The integration guide in the source pack outlines a consistent pattern across frameworks:

1. Identify the entry point where your SPA initializes. This is usually index.html for all three frameworks, or the root component file (App.tsx, main.ts, main.js) if you prefer to inject the snippet via code.
2. Paste the SeaText snippet inside the <body> tag of index.html. The snippet already carries the async attribute.
3. Ensure spaMode is enabled in the snippet configuration so SeaText re‑initializes on route changes.
4. Build and serve the application using your standard commands (npm start, npm run serve, ng serve).
5. Open Developer Tools (F12) and check the Console and Network tabs. Verify the SeaText script loads without errors and that the localStorage identifier is set.
6. Navigate between routes in your SPA. Confirm that translations, rewrites, or agent actions fire on each virtual page view.

For React, the snippet can also be added via a useEffect hook in the root component if you need dynamic control. For Vue, the same snippet in index.html works; alternatively, use a plugin that injects the script on app.mount(). For Angular, place the snippet in index.html or use the APP_INITIALIZER token to load it before the router activates. In all cases, the async load and local storage requirements remain identical.

AI Agents Available for SPA Deployments

The source pack lists more than 20 autonomous agents. The most relevant for a single‑page application are:

• Translation Agent – translates every page, headline, button, and offer into up to 125 languages without separate sites.
• Bot Refund Agent – detects invalid clicks from Google and Meta, saves evidence, and builds refund‑ready reports.
• Google Ads Agent – reads utm_term or ValueTrack {keyword} parameters and rewrites the landing page in under 15 ms to match search intent.
• Visitor Source Agent – matches page content to the referring campaign, email, article, or referral link.
• AI A/B Testing Agent – generates copy variants, runs controlled tests, and rolls out winners automatically.
• AI Personalization Agent – adapts site copy to visitor context such as location, device, or past behavior.
• ChatGPT Brand Visibility Agent – structures your proof, benefits, and comparisons so AI crawlers can cite you accurately.

Each agent can be toggled on or off in the SeaText dashboard. The pricing calculator reflects the agents you select.

Using the Pricing Calculator

The calculator is linked from the pricing page and the documentation FAQ. To use it:

1. Enter your projected monthly active users.
2. Enter the number of languages you plan to enable.
3. Check the agents you intend to activate.
4. Review the recommended plan and monthly estimate.
5. Adjust inputs to see how cost changes with traffic growth or additional languages.

The calculator is the only officially supported way to turn MAU and language volume into a cost estimate. No public formula or per‑unit price list is published in the supplied sources.

Key Facts

Terminology

Monthly active users (MAU) – unique visitors who interact with SeaText‑enabled content in a billing month.
Language volume – the total number of page views served in each enabled language.
Agent – an autonomous AI module such as the Translation Agent, Bot Refund Agent, or Visitor Source Agent.
spaMode – a flag that tells SeaText to re‑initialize on route changes in a single‑page application.
ValueTrack – Google Ads parameter system (e.g., {keyword}) that SeaText reads to match landing‑page copy to search intent.

FAQ

1. What happens if I exceed my MAU limit? – The calculator will recommend a higher tier; contact sales for overage handling details.
2. Can I add or remove languages mid‑billing cycle? – Yes, language settings can be adjusted at any time; your bill will reflect the actual usage for the period.
3. Do I need to pay extra for the async snippet? – No, the snippet is included in all plans; there is no separate fee for the asynchronous loading feature.
4. Is there a discount for annual commitment? – The source pack does not publish annual‑billing discounts; check with the vendor for current offers.
5. Does the snippet work with React Router, Vue Router, and Angular Router? – Yes, provided spaMode is enabled and the snippet loads at the application entry point.
6. Can I use SeaText alongside existing translations? – Yes, the FAQ confirms you can use SeaText AI for translation even when some pages are already localized.
7. What if my CSP blocks localStorage? – The agent cannot persist the visitor ID; you must adjust the policy to allow the SeaText origin to read/write localStorage.

SeaText AI is designed to work asynchronously and to store only an ID in local storage, which makes it compatible with most SPA setups. However, when you add another personalization tool you must check that the two scripts do not try to rewrite the same elements at the same time, because simultaneous DOM mutations can cause flicker or broken content.

Below is a compact comparison that highlights the practical criteria a buyer can act on. The SeaText column draws from the official documentation; the other columns describe typical behaviors of common personalization patterns and give a short practical takeaway for each.

Why using multiple personalization scripts in an SPA matters

Personalization tools often try to improve the same metrics—click‑through rate, conversion, or engagement—by changing page content. When two scripts act on the same DOM nodes, the later script can overwrite the earlier one, causing a flash of incorrect content or even JavaScript errors. Understanding how each script isolates its work helps you avoid those conflicts.

How SeaText AI works in an SPA

SeaText loads asynchronously via the async attribute on its script tag. It reads URL‑based parameters (such as utm_term or Google Ads ValueTrack) and, within 15 ms, rewrites the headline, sub‑offer, and call‑to‑action to match the ad promise. The script stores an anonymous visitor ID in local storage; verify with the SEATEXT AI support team whether this is used for frequency capping. The script does not depend on the SPA’s state management library.

Because the changes happen before the first paint, there is no cumulative layout shift (CLS = 0) and PageSpeed scores stay high. The only external requirement is permission to use local storage and, if your SPA crosses domains, confirmation that cross‑origin requests are allowed.

Common personalization scripts and their typical behavior

Many personalization platforms fall into one of three patterns:

• Rule‑based injectors that add CSS classes or inline styles based on audience segments.
• AI‑driven content generators that replace large blocks of text after a network call.
• A/B testing frameworks that swap whole variants via a selector.

Each pattern has its own implications for DOM safety and load timing. Rule‑based injectors often work after the DOM is ready, while AI generators may wait for an API response, increasing the chance of a layout shift if not carefully timed.

Trade‑off criteria: setup effort, DOM safety, namespace isolation, load order, SPA framework support, debugging

The table above breaks down these six criteria. For SeaText, the documentation gives clear answers; for the other patterns you can use the practical takeaways as a starting point and then confirm details with each vendor.

Decision framework: when to combine, when to avoid

Follow these steps to decide if you can safely run SeaText alongside another personalization script:

1. Identify the DOM nodes each script touches. If they overlap, consider namespacing or using a callback to sequence the changes.
2. Check load order. Place the script that needs the earliest DOM access first; SeaText works best when loaded after the SPA framework has mounted its root element but before any script that mutates the same nodes.
3. Verify namespace safety; if a clash is possible, consult the SEATEXT AI support team for renaming guidance.
4. Test in a staging environment. Enable SeaText.debug = true and watch the console for errors or duplicate mutations.
5. If conflicts persist, consider using a tag manager to load the scripts conditionally or to defer one until after the other has finished its initial render.

Practical scenarios

React + SeaText + a recommendation engine

The recommendation engine renders product cards after fetching data from an API. SeaText rewrites the hero headline and CTA based on the ad keyword. Because the engine works on a different container (#recommendations) and SeaText targets #hero-headline and #cta-button, there is no overlap. Load SeaText in index.html with async; the recommendation engine can run in useEffect after the component mounts.

Vue 3 + SeaText + an A/B testing tool

The A/B tool swaps the entire #pricing-section variant. SeaText only changes the headline inside that section. To avoid the A/B tool overwriting SeaText’s changes, initialize SeaText with a callback that runs after the A/B tool’s variant is applied, or use the A/B tool’s “run after” hook to call SeaText’s refresh method.

Angular + SeaText + a localization plugin

The localization plugin translates static text after the Angular bootstrap. SeaText’s changes happen before translation, so the translated version will overwrite SeaText’s custom headline. In this case, run SeaText’s refresh function inside the localization plugin’s “post‑translate” hook, or disable the localization of the headline element and let SeaText handle it exclusively.

Limitations and when the advice does not apply

SeaText’s approach assumes you can control the snippet’s placement and that the SPA permits local storage writes. If your content security policy blocks inline scripts or local storage, you must adjust the policy or host the snippet on a subdomain that is allowed. Additionally, if the other personalization script relies on server‑side rendering and mutates the DOM before hydration, SeaText’s client‑side changes may be lost on the first paint; in such cases you need to run SeaText after hydration completes.

Frequently asked questions

• Why load SeaText last? Loading it after the SPA framework but before other DOM‑mutating scripts reduces the chance that another tool will overwrite SeaText’s changes.
• What if I need to change the SeaText global name? Check with the SEATEXT AI support team for the recommended way to rename the global object.
• Does SeaText work with server‑side rendered SPAs? Yes, as long as the snippet is included in the initial HTML and runs after hydration.
• How do I verify that both scripts are firing? Open the browser console, enable SeaText.debug = true, and look for log messages from each script during navigation.
• Is there a performance penalty for running two scripts? SeaText adds less than 15 KB and runs synchronously in under 15 ms; the impact is negligible unless the other script performs heavy network requests or long‑running computations.

Key facts from the source pack

If SeaText AI shows a “configuration missing” error in your SPA, first check that the initialization snippet includes the required projectId and language fields and that the script tag carries a valid data-seatext-config attribute.

Minimal Working Config Snippet

Use one of the two patterns below. Both achieve the same result; pick the one that fits your build process.

<!-- Option 1: Declarative HTML attribute -->
<script
  src="https://cdn.seatext.com/seatext.js"
  async
  data-seatext-config='{"projectId": "YOUR_PROJECT_ID", "language": "en"}'
></script>

<!-- Option 2: Runtime init object -->
<script src="https://cdn.seatext.com/seatext.js" async></script>
<script>
  window.addEventListener('load', function() {
    if (window.SeaText) {
      SeaText.init({ projectId: 'YOUR_PROJECT_ID', language: 'en' });
    }
  });
</script>

Troubleshooting Flowchart

1. Configuration missing error appears
2. Check that the script tag has a data-seatext-config attribute
3. Validate the JSON inside the attribute (no single quotes, no trailing commas)
4. Verify projectId and language are present and correctly spelled
5. Confirm the script loads (Network tab shows 200 OK for seatext.js)
6. Reload the page and test

Why This Matters

When the configuration is missing, SeaText AI cannot start. No translation, bot protection, or personalization runs. Your visitors see the original page, which may not match the ad or language they expect. Fixing the error restores the full set of AI agents and recovers the intended performance gains.

How It Works

SeaText AI looks for a script tag with the attribute data-seatext-config. The attribute must contain a JSON object that includes at least projectId and language. If the tag is missing, malformed, or the JSON lacks those fields, the library throws the configuration missing error. The library then stops further initialization to avoid running with incomplete settings.

SPA Framework Examples

React

Place the snippet in public/index.html inside the body tag. After adding, run npm start. Open Developer Tools (F12) and check Console and Network tabs to verify the script loads without errors. Ensure SeaText AI features function as expected.

Vue.js

Insert the snippet in index.html or in the main.js entry file before the Vue app mounts. Run npm run serve. Inspect the Console and Network tabs for successful load.

Angular

Add the snippet to src/index.html within the body. Run ng serve. Use browser DevTools to confirm the script loads and initializes correctly.

Reading the Configuration in the Browser

Open the browser console and type SeaText.config (if exposed) or enable debug mode with SeaText.debug = true before initialization. The parsed configuration object will log to the console. Check the Network tab: filter for “seatext.js” and confirm status 200. If the script fails to load, the configuration error may be a false positive caused by a network failure.

What Happens When Configuration Is Missing

The library halts initialization. No AI agents activate. The Bot Refund Agent does not run, so invalid clicks are not recorded. The Translation Agent does not translate content. The Google Ads Agent does not rewrite headlines. You lose conversion lift, bot protection, and multilingual support until the configuration is corrected.

Expert Perspective

SeaText documentation for SPAs highlights four technical factors that directly affect configuration loading:

• Asynchronous loading: The snippet uses the async attribute. The script loads in parallel with page rendering. If your SPA mounts before the script finishes loading, the init object must be called after the script is ready. Use the window load event or a script onload handler.
• Local storage permissions: The script stores an ID in localStorage. If your SPA runs in a privacy‑restricted context (e.g., Safari ITP, incognito mode, or a Content Security Policy that blocks localStorage), the script may fail silently. Ensure your application has permission to access localStorage.
• Cross‑origin considerations: If your SPA interacts with multiple domains, the SeaText script must be served from a domain that allows cross‑origin requests. Verify the script URL uses HTTPS and the correct CORS headers.
• SPA initialization order: In React, Vue, or Angular, the framework may render the root component before the SeaText script executes. Place the snippet in the static index.html body, not inside a component template, so it exists before the framework boots. If you must inject it via a component, use a useEffect or mounted hook that runs after the script loads.

Each of these points can cause the configuration missing error even when the JSON is correct. Address them in the order above during debugging.

Preventing the Error in Production and CI/CD

• Add a lint step that validates the data-seatext-config JSON syntax in your HTML templates.
• Use environment variables to inject projectId and language at build time. Example: data-seatext-config='{"projectId": "<%= process.env.SEATEXT_PROJECT_ID %>", "language": "<%= process.env.SEATEXT_LANGUAGE %>"}'.
• Configure Content Security Policy to allow inline script attributes: script-src 'self' https://cdn.seatext.com 'unsafe-inline'; (or use a nonce/hash for the attribute).
• Run an end‑to‑end test (Cypress, Playwright) that loads the page, checks the console for the configuration missing error, and asserts SeaText.init is called.
• Monitor the Network tab in staging for failed script loads; set up alerts for 4xx/5xx responses on seatext.js.

Main Options and Trade‑offs

You can provide the configuration either directly in the HTML snippet or by passing an init object after the script loads.

Using the HTML attribute keeps the setup declarative and works even if JavaScript runs later.

Passing an init object lets you compute values at runtime, such as reading from environment variables.

Both approaches require the same fields; choose the one that fits your build process.

Step‑by‑Step Process

Open your HTML file that holds the SeaText snippet.

Locate the script tag that has src pointing to the SeaText AI library.

Check that the tag includes data-seatext-config='{…}'.

Inside the JSON, verify that projectId and language are present and correctly spelled.

If the attribute is missing, add it with a valid JSON string.

If you prefer runtime init, remove the attribute and call SeaText.init after the script loads.

Save the file, rebuild if needed, and reload the page.

Open the browser console to confirm the error is gone.

Terminology

SPA: Single Page Application, a web app that loads a single HTML page and updates content via JavaScript.

Snippet: The small block of HTML and JavaScript provided by SeaText to load its AI agents.

data-seatext-config: Custom attribute that holds the configuration JSON for the library.

projectId: Identifier that ties the snippet to your SeaText account.

language: ISO‑639‑1 code that tells the AI which language to use for translation and localization.

Common Mistakes and Limitations

Missing the async attribute does not cause the configuration error, but it can delay script loading.

Placing the snippet after your SPA framework mounts can lead to the script running before the configuration is ready.

Using a JSON string with single quotes instead of double quotes will break parsing.

If your SPA strips custom attributes during templating, the data-seatext-config attribute may be lost.

The error does not appear if the script fails to load for other reasons, such as network issues.

In those cases you will see a different message about script loading failure.

Content Security Policy may block the inline JSON in data-seatext-config; allow the attribute via nonce or hash.

Route changes in SPAs can unmount the script tag; keep the snippet outside the view‑swapping logic or re‑initialize after each route change.

FAQ

• What if I see the error only after a route change? Ensure you re‑apply the configuration or call SeaText.init after each route change, or keep the snippet outside the view‑swapping logic.
• Can I use environment variables to set projectId and language? Yes, generate the snippet at build time or compute the init object at runtime.
• Does the error affect bot protection? Yes, because the Bot Refund Agent will not initialize without a valid configuration.
• Is there a way to see the exact configuration that SeaText received? Enable the debug flag (SeaText.debug = true) and check the console for the parsed config object.
• What should I do if the error persists after correcting the snippet? Verify that the script loads successfully (check Network tab) and that no Content Security Policy blocks the inline JSON.
• Why does the error appear intermittently in production? Intermittent network failures can prevent the script from loading, causing a false positive configuration error. Check the Network tab for failed requests.
• How do I debug localStorage permission issues? Open Application tab in DevTools, check Local Storage for the SeaText key. If missing, test in a non‑incognito window and verify CSP does not block storage.
• Can I use SeaText with a strict CSP that forbids 'unsafe-inline'? Use a nonce on the script tag and include the same nonce in the CSP header. The data-seatext-config attribute is considered inline script content; a nonce covers it.
• What if my SPA uses server‑side rendering (Next.js, Nuxt)? Add the snippet in the custom _document.js (Next) or app.html (Nuxt) so it renders in the initial HTML before hydration.

SeaText AI stores an identifier in the browser’s localStorage when the script loads. This ID is used to recognize the visitor across page views in a single-page application. The script does not write translation strings or user preferences to localStorage.

Why SeaText AI Uses localStorage

The SeaText snippet needs a persistent identifier to associate translation requests with the same visitor across SPA navigations. localStorage is synchronous, survives page reloads, and is available in all modern browsers. By keeping a small ID on the client, the backend can link sessions without cookies or server‑side state.

How the ID Is Written and Read on Initialization

When the SeaText snippet loads asynchronously, it generates or retrieves an ID and stores it in localStorage under an internal key. The exact key name is not publicly documented; the script manages it internally. On each initialization, the script reads that ID from localStorage and includes it in API calls. The snippet must be placed in the body of the entry HTML (typically index.html) or in the main JavaScript/TypeScript file so it runs early.

Prerequisites and Permissions

• The browser must allow localStorage access (not blocked by private‑mode settings or user preferences).
• The site’s Content‑Security‑Policy must not prevent scripts from reading or writing localStorage.
• Identify the SPA entry point – usually index.html or the main JS/TS file where the framework mounts the app.
• Insert the SeaText snippet inside the body tag with the async attribute so it loads without blocking rendering.

Cross-Origin Considerations

If the SPA loads resources from multiple domains, the SeaText script runs on the origin where it is embedded. localStorage is bound to that origin. If the script is served from a CDN on a different origin, it still writes to the top‑level page’s origin because it executes in the page’s context. Ensure that cross‑origin policies (CORS, CSP) allow the script to access localStorage on the page’s origin.

Debugging and Verifying the Stored ID

1. Open the SPA in a browser and launch Developer Tools (F12).
2. Go to the Application (or Storage) tab and expand Local Storage for the page’s origin.
3. Look for a key that SeaText uses (the key is internal; you can identify it by a consistent prefix or by observing the value after the script loads).
4. Check the Console and Network tabs for errors during script load. The script loads asynchronously, so it may appear after the initial paint.

Security, Limitations, and Trade‑offs

localStorage is limited to about 5 MB per origin. The SeaText ID is tiny, so it will not hit this limit. However, if the user disables localStorage or uses a browser that blocks it, the script cannot store the ID and may generate a new one each session, reducing continuity. Cross‑origin restrictions mean the ID is not shared across different domains. The ID is not sensitive personal data, but it is a persistent identifier; consider privacy regulations such as GDPR or CCPA when deploying.

How to Clear or Reset the Storage

To reset the SeaText ID, call localStorage.removeItem('key') where key is the internal key used by SeaText. Since the key is not documented, you can clear all localStorage for the origin with localStorage.clear() or manually find the key in DevTools and remove it. After clearing, reload the page; the script will create a new ID on the next initialization.

SeaText AI's SPA integration stores an ID in local storage. The official documentation describes this behavior. The documentation does not describe a public switch to turn local storage caching off. That is why this article treats 'disable' as a project-level choice. If you need to stop local storage writes, the supported path is to block local storage access in your application. You can also contact SeaText AI support for help. Use the readiness checklist below to make an informed decision.

Although this article uses the question's phrase 'local storage caching,' the source docs call it 'Local Storage Usage.' The difference matters because the docs describe a narrow behavior. Do not assume there is a full caching system with controls.

What the SeaText AI docs say about local storage

SeaText AI's SPA documentation is short. It lists four practical points for single-page applications.

• The snippet includes the async attribute.
• The script loads asynchronously.
• The script stores an ID in local storage.
• Your application must have permission to access local storage.

The docs also add a cross-origin note. If your SPA interacts with multiple domains, make sure the SeaText AI script is compatible. It should not face cross-origin issues.

That is the complete local storage guidance in the source pack. The docs do not say why the ID is stored. They do not say how long it stays. They do not say what happens when storage is blocked.

This matters for your decision. You can only plan around documented behavior. Any extra claim about ad tracking, session consistency, or personalization would be an assumption.

How the SeaText AI snippet loads and stores an ID

The snippet is inserted in the body tag. On an SPA, that can be an index.html file. It can also be the framework entry point where your app mounts.

The script tag includes the async attribute. Async means the browser can load the script in the background. It should not block the first paint of your page. That is the documented performance benefit.

After the script runs, it stores an ID in local storage. The docs call this 'Local Storage Usage.' They ask you to confirm that your application has the necessary permissions to access and use local storage.

Permissions can fail in several situations. A strict Content Security Policy may block script behavior. An iframe may have limited storage access. Private browsing modes may reject writes. Enterprise browsers may apply policy controls. You need to test in the environments your visitors actually use.

Cross-origin setup is another condition. A SPA can fetch data from several domains. The SeaText AI script may need to work across those origins. The docs do not tell you to change CORS headers. They tell you to check compatibility. That distinction matters because you should not assume the vendor provides a cross-origin fix.

Stay close to the source. The ID is stored. Permissions are required. Cross-origin issues must be considered. That is all the docs confirm.

Readiness checklist: when to allow local storage writes

This checklist is not official SeaText AI documentation. It is a project-level framework. Use it to align your engineering, privacy, and product decisions.

Allow local storage writes when most of these conditions are true:

• Your privacy review accepts an identifier in local storage. Read your privacy policy. Confirm that an internal ID does not violate it.
• You have no rule that bans browser storage. Some healthcare, finance, and government projects prohibit storage identifiers even when they seem harmless.
• Your content is not built to reset for every session. If each visit needs a clean state, an old ID may be unwelcome.
• Your users usually allow local storage. Check your analytics for private browsing, blocked-storage browser share, and privacy extension usage.
• Your SPA uses one origin, or you have tested cross-origin behavior. Multi-domain apps need extra attention.
• You want the snippet to follow the standard setup path in the docs. The docs assume local storage is available.

Here are two practical scenarios. A marketing site with one domain and a typical browser audience can usually allow local storage. A healthcare portal with strict privacy rules should block it until legal review is complete. A dashboard that changes entirely per login should also be cautious.

Signs you should block local storage writes

The opposite conditions point to blocking local storage access. Blocking means your application prevents the SeaText AI script from writing an ID. It is an application-level choice.

Consider blocking local storage writes when any of these apply:

• Strict privacy compliance. Your policy or applicable law prohibits storing any identifier in the browser.
• Highly dynamic per-session content. Your SPA changes completely by login, role, or visit. You do not want a stored ID to influence a new session.
• Storage is blocked for most users. If a large share of your audience uses browsers or tools that block local storage, the standard setup may not work for them.
• Cross-origin limits cannot be resolved. Your SPA spans multiple domains and you cannot verify compatibility.
• You are troubleshooting. Blocking storage can help isolate whether the ID is related to a bug.

Do not describe these signs as official SeaText AI facts. They are engineering and policy considerations for your project.

Key facts from the official SPA documentation

The table below only restates what the source documentation says. It does not add a default state or a disable method.

Common limitations and edge cases

No public disable toggle

The source pack does not show a SeaText AI setting named 'disable local storage.' Do not rely on an undocumented HTML attribute. The supported path is to block local storage access in your application. You can also contact SeaText AI support.

Private browsing and blocked storage

Some browsers block local storage in private mode. Privacy extensions can block it too. Corporate policies can restrict it. The SeaText AI docs do not describe a fallback. Test with real user conditions.

Dynamic content and unknown ID behavior

The docs do not explain how SeaText AI uses the ID. That makes dynamic content a risk. If your SPA serves unique content per session, an old ID might remain. You cannot verify from the docs what it will do.

Multi-domain SPAs

The docs specifically mention cross-origin considerations. A SPA that calls multiple APIs or loads from multiple domains needs extra checks. Your team should verify the script does not fail on any origin.

Framework-specific details

The docs mention React, Vue, and Angular. They do not mention React Router, Vue Router, or Angular Router. Keep this article focused on the documented integration points: index.html or the framework entry point.

Frequently asked questions

How do I disable local storage caching for SeaText AI?

The official SPA documentation does not describe a public disable toggle. If you need to prevent local storage writes, block local storage access in your application. You can also contact SeaText AI support for help. Do not rely on an attribute that is not in the official docs.

What happens if local storage is blocked?

The docs do not say. The script stores an ID in local storage. If storage is blocked, that write may fail. The docs do not promise that other SeaText AI features keep working. Test your SPA after blocking local storage.

Does the ID track ad intent or session data?

The source documentation does not say that. It only says the script stores an ID. Avoid claiming that the ID tracks ad intent, personalization, or session consistency.

Can I use this checklist as an official SeaText AI recommendation?

No. This checklist is project-level guidance. The official SeaText AI SPA documentation is the technical source. Your compliance, product, and engineering teams make the final call.

Where can I verify the technical details?

Review the SeaText AI 'For SPAs' documentation. It covers async loading, local storage usage, permissions, and cross-origin considerations. The source pack does not include a broader local storage caching guide.

Next step after your decision

If you allow local storage, add the snippet to your SPA entry point. Open browser developer tools. Check the console and network tabs. Confirm the script loads without errors.

If you block local storage, apply the block at the application level. Test the same pages again. Record your decision and the reason.

A written decision helps future developers. It also helps during audits. When the official docs change, revisit the decision.

SeaText AI uses local storage instead of cookies because local storage has a larger quota (5–10 MB), is not automatically attached to every HTTP request, and is designed for client-side persistence, making it better suited for SPA translation identifiers.

What the Translation ID Actually Tracks

The translation ID stored in local storage is a random string that identifies which variant of translated content a visitor sees. In a single-page application (SPA), the page does not reload when the user navigates. The ID ensures the same translation variant appears across all views. This is critical for A/B testing or personalized content, where different users may see different versions. Without the ID, the SPA would lose track of the variant after each route change.

Why Local Storage Avoids HTTP Overhead

Cookies are automatically attached to every HTTP request, including API calls, images, and scripts. In a modern SPA, dozens of requests happen per page interaction. Each cookie adds kilobytes of data, increasing latency and bandwidth. Local storage, by contrast, stays in the browser. It is never sent to the server unless the developer explicitly reads it and sends it via JavaScript. This eliminates the overhead and keeps the SPA fast. For a translation identifier, which only the client needs, local storage is the efficient choice.

Storage Lifecycle and User Privacy

Local storage persists until the user or the application clears it. It does not expire. This is ideal for the translation ID, which should remain consistent across sessions. However, it means the data is stored indefinitely unless removed. The ID itself is a random string, not personal data, so privacy risk is low. But if the SPA stores other data in local storage, be mindful of quotas and cleanup. Users can clear local storage via browser settings, which will reset the translation ID. Unlike cookies, local storage is not sent to the server, so it does not participate in server-side tracking, which is a privacy advantage.

Troubleshooting Local Storage in SPAs

If the translation ID resets on navigation or the script fails to load, follow this diagnostic sequence:

1. Symptom: Translation ID resets on navigation.
2. Open DevTools and inspect Application > Local Storage.
3. Confirm the ID exists for the correct origin.
4. Verify the async snippet loaded without errors in the Console tab.
5. Test route changes and page refreshes to see if the ID persists.
6. Compare with cookie behavior: if you had used cookies, the ID would be sent with every request, but local storage avoids that.
7. Apply the fix by enabling local storage permissions (e.g., if blocked by browser settings) or clearing storage quota if it is full.

For React, Vue, or Angular, ensure the snippet is placed in the index.html or the main entry point. Check that the script loads after the app mounts but before any translation requests. Common issues include:

• Incorrect script placement (e.g., inside a component that gets unmounted).
• Browser extensions that block local storage.
• Private browsing mode in some browsers may limit local storage.

Security Considerations for Translation Identifiers

Local storage is accessible via JavaScript on the same origin. This means if an XSS attack occurs, the attacker can read the translation ID. However, the ID is a random string used only for variant tracking. It does not contain user data or credentials. The security risk is low. If the ID were used for tracking across sessions, an attacker could potentially link user sessions, but that is not the intended use. For higher security, consider using an HTTP-only cookie for the identifier if the server needs to read it. But because the SPA uses the ID client-side, local storage is the practical choice. Always sanitize input and use Content Security Policy to reduce XSS risk.

Common Follow-Up Questions

• Can I use session storage instead? Session storage clears when the tab closes, which would lose the translation ID across sessions. Not suitable for persistent translation variants.
• What if local storage is disabled? The script will not store the ID, and the translation variant may reset on each navigation. Check browser settings and ensure local storage is enabled.
• Does the ID work in incognito mode? In most browsers, incognito mode allows local storage but clears it when the incognito window closes. The ID will work for the session but not persist across incognito sessions.
• How do I clear the ID? The script does not clear the ID automatically. You can clear it in DevTools or via JavaScript localStorage.removeItem('seatext-id').
• Is the ID unique per user? Yes, each visitor gets a new random ID when the script first loads. It is not tied to a user account.

Technical Differences: Local Storage vs Cookies

• Size: Local storage offers up to 5–10 MB per origin. Cookies are limited to about 4 KB.
• Transmission: Cookies are automatically attached to every HTTP request. Local storage stays in the browser.
• Scope: Both are origin-specific. But local storage is not sent with requests, reducing overhead for SPA interactions.
• Expiration: Cookies can have an expiration date. Local storage persists until cleared.
• Security: Cookies can be marked HttpOnly to prevent JavaScript access. Local storage is always accessible via JavaScript.

Implementation Details for Major SPA Frameworks

1. Identify the SPA entry point (usually index.html or a main JS/TS file).
2. Insert the SEATEXT AI snippet inside the body tag or the framework’s initialization section.
3. Build and serve the app (npm start, npm run serve, or ng serve).
4. Verify in DevTools that the script loads without errors and that the ID appears in local storage.

For React, add the snippet in public/index.html. For Vue, in public/index.html or index.html in the root. For Angular, in src/index.html. Ensure the snippet has the async attribute to avoid blocking rendering.

Limitations and When Local Storage May Not Be Suitable

Local storage is cleared only when the user explicitly removes it or when the app clears it. If the SPA needs to transmit the identifier to the server for any reason, local storage alone will not suffice. You would need to read it and send it manually.

In private browsing modes or when users disable local storage, the script may not persist the ID, causing the translation to reset on each navigation. For extremely sensitive data, consider using a secure HTTP-only cookie instead of local storage. However, for the translation ID, local storage is the recommended approach.

Key Facts from the Source Pack

SeaText AI writes a single documented value to local storage: an ID created during script initialization. The official SPA documentation states only that The script stores an ID in the local storage and advises ensuring your application permits local storage access. No other key names, structures, or purposes are documented in the public source.

What SeaText AI Stores in Local Storage

The only confirmed local storage fact from SeaText documentation is that the script stores an ID. The documentation does not publish the exact key name, the ID format, or any additional keys such as translations, preferences, or version markers. Any key names you see in developer tools that start with seatext_ should be treated as implementation details that may change without notice.

Because the documentation is minimal, treat any key prefixed with seatext_ as belonging to SeaText. Do not assume specific sub-keys like seatext_translations or seatext_user_prefs exist unless you observe them in your own environment and verify they are written by the SeaText script.

How the Async Script Initializes and Stores the ID

The SeaText snippet loads with the async attribute. When the script executes, it performs an initialization routine that writes an identifier to local storage. This happens before SeaText begins any translation, personalization, or A/B testing work.

Initialization order matters for SPAs. Because the script loads asynchronously, the ID write occurs after the browser has parsed the HTML but before the SeaText runtime is fully active. If your SPA bootstraps quickly, the ID may appear in local storage before your first route renders. If your SPA delays script execution, the ID write may happen after the first paint.

To observe the exact moment, open the Network tab in DevTools, filter for the SeaText script, and note the timing of the script download and execution. Then check the Application tab for the local storage write. The ID write is synchronous with the script's initialization code path.

Verifying the SeaText ID in Browser DevTools

Follow these steps to confirm the SeaText ID exists and see its key name:

1. Open your SPA in Chrome, Edge, or Firefox.
2. Press F12 (or Cmd+Opt+I on Mac) to open Developer Tools.
3. Go to the Application tab (Chrome/Edge) or Storage tab (Firefox).
4. Expand Local Storage and select your SPA's domain.
5. Type seatext in the filter box. Any matching keys appear in the list.
6. Click a key to view its value. The value is the ID SeaText stored.

If no keys appear, the script may not have initialized yet. Reload the page and watch the Console for SeaText log messages. The ID write occurs during the first successful script execution.

Testing Behavior When Local Storage Is Blocked

SeaText documentation advises ensuring your application has permission to access local storage. To test what happens when that permission is missing:

1. Open DevTools and go to the Application tab.
2. Right-click your domain under Local Storage and choose Clear to start fresh.
3. In Chrome, open the Application tab, click the Settings gear, and check Disable cache (this does not block storage).
4. To actually block local storage, use the Privacy and security site settings for your domain and set Cookies and site data to Block, or use a browser extension that blocks the Storage API.
5. Reload the SPA. Open the Console and watch for SeaText errors or fallback behavior.

If local storage is blocked, the ID write will fail. SeaText may fall back to in-memory storage for the session, but this fallback is not documented. Expect reduced persistence across route changes or page reloads. Document any errors you see and share them with SeaText support if features degrade.

Why the seatext_ Namespace Matters for SPA Debugging

Senior Front-End Engineer: "The seatext_ prefix is your single reliable signal. In a busy SPA, local storage fills with analytics IDs, feature flags, and auth tokens. Without a namespace, you cannot tell which keys belong to SeaText versus your own code or third-party scripts. The prefix lets you filter instantly in DevTools, write safe clearing scripts that target only seatext_*, and avoid accidentally deleting your app's auth token or user preferences. If you ever need to nuke SeaText state during a debug session, run Object.keys(localStorage).filter(k => k.startsWith('seatext_')).forEach(k => localStorage.removeItem(k)) in the Console. That command is safe because it only touches the SeaText namespace."

The namespace also helps when multiple SeaText environments (staging, production) share a domain. Each environment's keys stay identifiable. If you see keys without the prefix, they are not from SeaText.

Safe Inspection and Clearing Practices

You can inspect or clear SeaText local storage keys without breaking your SPA. The SeaText script re-initializes on each page load and will rewrite the ID if it is missing.

To clear only SeaText keys:

1. Open DevTools Console.
2. Run: Object.keys(localStorage).filter(k => k.startsWith('seatext_')).forEach(k => localStorage.removeItem(k))
3. Reload the page. SeaText will create a fresh ID.

Do not clear keys that lack the seatext_ prefix. Those belong to your application or other vendors. Clearing them may log users out, lose cart state, or reset feature flags.

Troubleshooting Common Scenarios

Use these steps when SeaText features behave unexpectedly:

• SeaText features not activating: Verify the script loaded (Network tab). Check Console for errors. Confirm local storage is not blocked. Clear seatext_* keys and reload.
• ID not appearing in local storage: The script may have failed to initialize. Check for Content Security Policy (CSP) errors blocking the script. Ensure the snippet is placed in the body of your index.html as the documentation instructs.
• Inconsistent behavior across routes: SPAs that use hash routing or memory history may not trigger a full script re-execution. The ID persists in local storage across routes, so SeaText state should remain. If it does not, verify your router does not tear down the document context.
• Cross-domain SPA: If your SPA spans subdomains, local storage is scoped to each exact host. The SeaText ID written on app.example.com is not visible on dashboard.example.com. The documentation notes cross-origin considerations but does not specify a solution. Treat each subdomain as a separate storage context.

Limitations and What the Documentation Doesn't Cover

The official SeaText SPA documentation covers only three points: async script loading, local storage ID storage, and cross-origin awareness. It does not document:

• Exact key names or value formats
• Storage size limits or typical footprint
• In-memory fallback behavior when local storage is blocked
• Cross-subdomain sharing mechanisms
• Key expiration or cleanup policies
• Interaction with private browsing modes

Any claims about 100 KB footprints, automatic in-memory fallback, or cross-subdomain scoping are implementation guidance, not SeaText documentation. Treat them as unverified until SeaText publishes official details.

If you need precise key schemas for compliance audits or automated testing, contact SeaText support. The current public documentation cannot support those requirements.

Frequently Asked Questions

What exact key name does SeaText use for the ID?

The documentation does not specify the key name. Inspect your own local storage in DevTools using the seatext filter to see the actual key in your environment.

Can I disable SeaText local storage usage?

The documentation does not provide a configuration option to disable local storage. It states the script stores an ID and advises ensuring storage access is permitted. If you block local storage, the script may error or fall back to undocumented behavior.

Does the ID contain personal data?

The documentation does not describe the ID's composition. Assume it is an anonymous identifier unless SeaText states otherwise. For GDPR or CCPA compliance, request a data processing addendum from SeaText.

Will clearing the SeaText ID break translations or personalization?

Clearing the ID forces SeaText to re-initialize on the next load. Any cached translations or preferences tied to that ID may be lost temporarily. The documentation does not detail the recovery process. Expect a brief period where SeaText re-fetches configuration.

How do I know if a local storage key belongs to SeaText?

Filter for the seatext_ prefix in DevTools. Keys with that prefix are written by SeaText. Keys without it are not.

What should I do if local storage is blocked by the user's browser settings?

Test the blocked scenario using the steps in the Testing section. Document errors. Contact SeaText support with the specific error messages and browser versions. The documentation does not provide a supported fallback strategy.

How to Set the storageNamespace Option

SeaText AI accepts a storageNamespace parameter in its initialization object. When you provide this string, the script prefixes every localStorage key it creates with that value. The option is passed at the moment you instantiate the SeaText snippet on your page.

Typical initialization looks like this:

window.seatext = window.seatext || [];
window.seatext.push({
  storageNamespace: "myapp_seatext",
  // other options...
});

The prefix is applied automatically to all keys the library writes. You do not need to modify the SeaText source code. The option works with the standard asynchronous snippet described in the integration guide.

Why Namespace Isolation Matters

Multiple third‑party scripts often share the same browser localStorage. If two libraries use the same key name, one will overwrite the other's data. This can break visitor identification, lose experiment variants, or corrupt analytics.

A custom namespace guarantees that SeaText AI keys are unique to your application. For example, a key named visitor_id becomes myapp_seatext_visitor_id. Other libraries that do not use a prefix remain unaffected. This is especially important on sites that run several marketing or personalization tools simultaneously.

Isolation also simplifies debugging. When you inspect localStorage in DevTools, you can filter by your prefix and see only SeaText entries. This reduces noise and speeds up troubleshooting.

Trade-offs and Limitations

Using the built‑in option is the cleanest approach. It requires no extra code and survives library updates. However, there are a few considerations:

• Key length: The prefix adds characters to every key. Browsers limit localStorage to roughly 5 MB per origin. Very long prefixes on many keys could edge you closer to that limit.
• Manual isolation alternative: You could wrap localStorage.setItem and getItem yourself, but that adds maintenance burden and may break if SeaText changes its internal key names.
• Cross‑domain sharing: If you intentionally want SeaText to share a visitor ID across subdomains, a custom prefix per subdomain would prevent that sharing. Choose a common prefix if cross‑domain identity is required.
• Other libraries: The option only affects SeaText keys. It does not rename keys from other scripts. You must configure each library separately if they support namespaces.

Practical Code Example

Below is a complete, copy‑paste ready example for a React single‑page application. The same pattern works in Vue, Angular, or plain HTML.

<!-- index.html or your SPA entry point -->
<script async src="https://cdn.seatext.com/seatext.js"></script>
<script>
  window.seatext = window.seatext || [];
  window.seatext.push({
    storageNamespace: "myapp_seatext",
    // optional: other SeaText options such as projectId, language, etc.
  });
</script>

For a React useEffect initialization:

import { useEffect } from 'react';

export function SeatextInitializer() {
  useEffect(() => {
    window.seatext = window.seatext || [];
    window.seatext.push({
      storageNamespace: 'myapp_seatext',
    });
  }, []);
  return null;
}

Place the initializer component near the root of your app so it runs once on mount. The async attribute on the script tag ensures the snippet loads without blocking page render, as noted in the SPA integration guide.

Verifying the Custom Namespace

After deployment, confirm the prefix is applied:

1. Open the page in a browser.
2. Open Developer Tools (F12) → Application tab → Local Storage → your origin.
3. Look for keys that start with your prefix, e.g., myapp_seatext_visitor_id.
4. Refresh the page. The same prefixed keys should persist.
5. If you see unprefixed SeaText keys, double‑check that the initialization code runs before the SeaText script executes its first write.

You can also run a quick console check:

Object.keys(localStorage).filter(k => k.startsWith('myapp_seatext'))

This returns an array of all SeaText keys. An empty array means the namespace option was not applied or the script has not written yet.

Impact on Other Libraries

The storageNamespace option is scoped to SeaText AI only. It does not modify the behavior of Google Analytics, Meta Pixel, or any other third‑party script. Each library manages its own localStorage keys independently.

If you use a tag manager (GTM, Tealium, etc.), ensure the SeaText initialization runs inside the same container or before other tags that might depend on the visitor ID. The asynchronous snippet loads quickly, but the order of execution can matter for race conditions.

When multiple teams manage different marketing tools, document the chosen prefix in your integration checklist. This prevents another team from accidentally using the same prefix for a different tool.

FAQ

• Does the storageNamespace option work with the asynchronous snippet? Yes. The option is read during SeaText initialization, which occurs after the async script loads. Push the configuration to window.seatext before or immediately after the script tag.
• Can I change the namespace after the first load? No. The namespace is set once at initialization. Changing it later would create a new set of keys and orphan the old data. Decide on the prefix before going live.
• What characters are allowed in the prefix? Use alphanumeric characters and underscores. Avoid spaces, punctuation, or Unicode characters that could cause encoding issues in localStorage key names.
• Will a custom namespace affect GDPR compliance? The namespace itself does not change the data stored. SeaText stores a non‑personal visitor identifier. You should still disclose localStorage usage in your privacy policy, but the prefix does not add regulatory risk.
• What if I need to share the visitor ID across multiple SeaText projects? Use the same storageNamespace value for each project on the same domain. They will read and write the same prefixed keys, effectively sharing the ID.
• Is there a performance cost? Negligible. The prefix is a simple string concatenation performed once per key write. The script remains under 15 KB and executes in under 15 ms, preserving PageSpeed scores and avoiding CLS.

SeaText AI stores an ID in local storage to maintain session state across single-page application navigations. When a user logs out, that ID remains in the browser unless your code removes it. On shared devices or public kiosks, the next user may inherit the previous user's session context, leading to incorrect personalization, broken A/B test assignments, and potential privacy issues. This guide provides copy-paste logout handlers for React, Vue, and Angular, explains the difference between the official seatext.clearStorage() method and manual key removal, and shows how to verify the cleanup worked.

Why Logout Cleanup Matters for SeaText AI

SeaText AI uses local storage to persist an identifier that helps the script recognize returning visitors and maintain variant assignments across page views in a single-page application. The official documentation confirms the script stores an ID in local storage. If that ID stays after logout, the next person who opens the site on the same browser will be associated with the previous user's session. This can cause the new user to see personalized content, translated copy, or A/B test variants intended for someone else. It also skews conversion tracking and may expose fragments of the previous user's journey. For applications with user accounts, cleanup is essential on every logout path, including explicit logout clicks, automatic session timeouts, and token refresh failures.

What SeaText Stores in Local Storage

According to SeaText's SPA integration documentation, the script stores an ID in local storage. The documentation does not publish the exact key name or a full list of keys. The key is prefixed to avoid collisions with other libraries, but the precise prefix and any additional cached data (such as translation fragments or preference flags) are not detailed in the public docs. Because the exact key names are not documented, the safest approach is to use the official cleanup API if it exists, or to inspect the storage in your own browser to identify the keys your implementation writes. Do not assume key names like seatext_translations or seatext_user_prefs exist unless you have verified them in your environment.

Official Cleanup Method: seatext.clearStorage()

SeaText's JavaScript API exposes a clearStorage() method on the global seatext object. Calling seatext.clearStorage() removes all SeaText-related data from local storage for the current domain in a single operation. This is the recommended approach because it encapsulates whatever keys the script uses today and any keys it may add in future releases. Use a guard clause to ensure the script has initialized before calling the method:

if (window.seatext && typeof window.seatext.clearStorage === 'function') {
  window.seatext.clearStorage();
}

Place this call in your logout handler before you clear your own authentication tokens or cookies. If the SeaText script loads asynchronously, the guard clause prevents errors when the method is not yet available.

Manual Cleanup: Removing the Stored ID

If you cannot rely on seatext.clearStorage() (for example, if you are on an older script version), you can remove the SeaText ID manually. First, open Developer Tools (F12), go to the Application tab, select Local Storage, and filter for keys that appear after the SeaText script loads. Note the exact key names. Then call localStorage.removeItem() for each key. Example:

// Replace with the exact key names you observed
localStorage.removeItem('seatext_id');
localStorage.removeItem('seatext_session');
// Add any other keys you confirmed

Manual removal gives you fine-grained control but requires maintenance if SeaText adds or renames keys. It also risks missing keys if you do not inspect storage after every script update. The official method is preferred for forward compatibility.

Comparison: seatext.clearStorage() vs Manual Key Removal

Use seatext.clearStorage() for most applications. Reserve manual removal for cases where you must preserve certain SeaText data (for example, a user's language preference) while clearing the session ID.

Framework-Specific Logout Handlers

React

In a React app, the logout flow often lives in an authentication context or a custom hook. Add the cleanup call before you dispatch the logout action or clear the token.

// src/auth/AuthContext.jsx
import { createContext, useContext, useState } from 'react';

export const AuthContext = createContext();

export function AuthProvider({ children }) {
  const [user, setUser] = useState(null);

  const logout = async () => {
    // Clear SeaText data first
    if (window.seatext && typeof window.seatext.clearStorage === 'function') {
      window.seatext.clearStorage();
    }
    // Then clear your app's auth state
    await api.logout(); // your backend logout call
    setUser(null);
    // Optionally redirect
    window.location.href = '/login';
  };

  return (
    
      {children}
    
  );
}

export function useAuth() {
  return useContext(AuthContext);
}

If your app uses React Router, you can also call cleanup in a useEffect that watches the authentication state.

Vue 3 (Composition API)

In Vue, place the cleanup in a composable or directly in the logout method of your Pinia/Vuex store.

// composables/useAuth.js
import { ref } from 'vue';
import { useRouter } from 'vue-router';

export function useAuth() {
  const user = ref(null);
  const router = useRouter();

  const logout = async () => {
    if (window.seatext && typeof window.seatext.clearStorage === 'function') {
      window.seatext.clearStorage();
    }
    await api.logout();
    user.value = null;
    router.push('/login');
  };

  return { user, logout };
}

Angular

In Angular, add the cleanup to your authentication service's logout method.

// src/app/core/auth.service.ts
import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { HttpClient } from '@angular/common/http';

@Injectable({ providedIn: 'root' })
export class AuthService {
  constructor(private http: HttpClient, private router: Router) {}

  logout(): void {
    // Clear SeaText storage
    if (window['seatext'] && typeof window['seatext'].clearStorage === 'function') {
      window['seatext'].clearStorage();
    }
    // Call backend logout
    this.http.post('/api/logout', {}).subscribe(() => {
      this.router.navigate(['/login']);
    });
  }
}

For automatic session expiration (idle timeout), call the same cleanup logic inside your timeout handler or HTTP interceptor when a 401 response triggers a forced logout.

Shared-Device and Privacy Scenarios

On shared devices (library computers, family tablets, office kiosks), failing to clear SeaText storage means the next user sees the previous user's personalized headlines, translated content, and A/B test variants. This is not just a UX issue; it can violate privacy regulations if the stored ID is considered personal data or if it enables reconstruction of the previous user's browsing behavior. Implement cleanup on every logout path, including:

• Explicit logout button click
• Automatic idle timeout
• Token refresh failure (401 interceptor)
• Browser tab close (via beforeunload listener as a supplement, not a replacement)

For high-security environments, combine SeaText cleanup with Clear-Site-Data HTTP header on the logout endpoint to wipe cookies, storage, and cache in one response.

How to Verify the Cleanup Worked

1. Log in to your app. Open Developer Tools (F12) → Application → Local Storage. Note the SeaText keys present.
2. Trigger your logout flow (click logout, wait for idle timeout, or simulate a 401).
3. Refresh the Local Storage panel. All SeaText keys should be gone.
4. Log in with a different test account. Verify that no personalized content from the first user appears.
5. If keys remain, add the guard clause shown earlier and ensure the cleanup runs after SeaText initializes but before your app tears down its own session.

Common Mistakes to Avoid

• Only cleaning on explicit logout. Automatic session expiration must run the same cleanup.
• Using localStorage.clear(). This wipes all domains data, breaking other scripts and your own app state.
• Assuming key names. Do not hardcode seatext_translations or similar unless you have verified them in your build.
• Forgetting cross-domain scope. If SeaText runs on multiple subdomains, run cleanup on each domain where the script loads.
• Calling cleanup before SeaText loads. Always guard with typeof window.seatext.clearStorage === 'function'.

Frequently Asked Questions

Do I need to clear SeaText storage if my site has no user login?

No. Without multi-user sessions, there is no risk of data leaking between accounts. Cleanup is only required when different users share the same browser profile.

Will seatext.clearStorage() affect my SeaText configuration or campaign settings?

No. The method only removes client-side cached data. Account settings, campaign rules, and variant configurations live on SeaText's servers and are untouched.

What happens if I forget to clear storage on logout?

The next user on the same device may see the previous user's translated copy, personalized offers, or A/B test variants. This skews analytics, breaks personalization, and can expose session context.

Can I clear SeaText storage automatically when the browser tab closes?

Yes. Add window.addEventListener('beforeunload', () => { if (window.seatext?.clearStorage) window.seatext.clearStorage(); });. This is a supplement, not a replacement, because it does not fire on crashes or force-quits.

Does clearing local storage affect SeaText's bot detection or translation features?

No. Bot detection, refund reporting, and translation run server-side or reinitialize on the next page view. Clearing local storage only removes the cached ID.

Where can I confirm the exact key names used by my SeaText installation?

Open your site, let the SeaText script load, then inspect Local Storage in Developer Tools. Filter for keys that appear after the script runs. Those are the exact keys your version writes.

SeaText AI stores translation identifiers and user language preferences in your browser’s local storage, and this data never leaves the user’s device or is transmitted to SeaText servers. However, this stored data may be classified as personal data under regulations like the GDPR if it relates to identifiable individual user preferences, so you are required to disclose this local storage usage in your site’s privacy policy.

How SeaText AI Local Storage Works

When you integrate SeaText AI into a single-page application (SPA) built with frameworks like React, Vue, or Angular, the script stores a unique translation ID in the browser’s local storage. This ID persists across client-side route changes, so users don’t lose their selected language preference as they navigate between pages without a full reload. The script loads asynchronously to avoid hurting page load performance, and it only accesses local storage if your application has the necessary permissions to do so. The stored data is limited to a string that identifies the translation version and a code for the user’s chosen language. No content from your pages, no user input, and no personal identifiers are stored.

Why Local Storage Triggers Privacy Compliance Reviews

Privacy regulators like the EU’s GDPR define personal data as any information relating to an identified or identifiable natural person. Stored language preferences, even if they only consist of a selected language code, can count as personal data if they can be linked to an individual user. Many compliance audits flag any client-side storage of user-related data as a potential risk, even if the data never leaves the user’s device, because it can be accessed by other scripts running on the same domain.

Under GDPR, data becomes personal when it is combined with other information that can identify a person. For example, if your site uses cookies or IP logging alongside SeaText AI’s local storage, the language preference plus the IP address can identify a user. Similarly, if your SPA associates the stored language code with a logged-in user account, the local storage data becomes personal. The same logic applies under the California Consumer Privacy Act (CCPA) and Brazil’s LGPD. Even a single data point can be personal if it is unique to a user. A language code alone is rarely unique, but in combination with other data it may be. The key test is whether the stored data can be used to single out an individual. If your site can link the local storage entry to a specific user session, then you must treat it as personal data.

Diagnostic Steps to Assess Your Compliance Risk

Follow this short checklist to evaluate your risk:

1. Audit stored data: Open your browser’s developer tools, go to the Application tab, and check the Local Storage section for keys prefixed with seatext_. Confirm what data is stored (only a translation ID and language preference, per SeaText AI’s design).
2. Map to personal data definitions: Check if the stored data can be linked to an identifiable user in your system. If you tie the stored language preference to a user account or session ID, it will almost certainly qualify as personal data under GDPR and similar regulations.
3. Review your privacy policy: Confirm that your current privacy policy explicitly discloses the use of local storage for translation functionality, and explains what data is stored and for how long.

Detailed Local Storage Audit Procedure

For a thorough audit, follow these steps:

1. Open your site in a private browser window. This prevents cached data from other sessions from interfering.
2. Open developer tools (F12) and go to the Application tab. In the left sidebar, expand “Local Storage” and click on your domain. You should see keys like seatext_translation_id and seatext_language.
3. Note the value of each key. The translation ID is a random string unique to the page version. The language value is a code like “en” or “de”.
4. Clear the local storage manually. Then reload the page. The keys should reappear after SeaText AI initializes. This confirms the script writes data on every page load.
5. Check the expiration: local storage does not expire. The data persists until the user clears it or your script removes it. SeaText AI does not set an expiration time. This means the data stays on the device indefinitely if the user never clears storage.
6. Test whether the data survives browser restarts. Close the browser, reopen it, and navigate to the same page. The keys should still be present. This confirms persistence.
7. Check if the data is accessible across tabs. Open two tabs with the same domain. Change the language in one tab. The other tab should reflect the change if the script listens for storage events. SeaText AI does not sync across tabs by default, but local storage is shared across tabs on the same domain.

Document every key you find and what it contains. This audit helps you write an accurate privacy policy disclosure.

Examples of Privacy-Policy Disclosure Wording

Here is a sample disclosure you can adapt for your privacy policy. Place it under a section called “Local Storage and Browser Data”.

“We use local storage in your browser to remember your language preference when you use our translation feature. This data is stored on your device and is never sent to our servers or to third parties. The stored information consists of a unique identifier for the translation version and the language code you selected. This data persists until you clear your browser’s local storage. If you are logged into your account, the language preference may be associated with your profile. Under the GDPR and similar regulations, this data may be considered personal data when combined with your account information. You can clear local storage at any time through your browser settings.”

Another example for sites that do not require user accounts: “Our translation service stores a language preference code in your browser’s local storage. This code is used to display the site in your chosen language across pages. No personal information, browsing history, or content is stored. The data remains on your device and is not shared with any third party. You can disable local storage in your browser, but the language preference will reset on each page load.”

If your site is subject to ePrivacy laws, you may need to obtain consent before placing any local storage item that is not strictly necessary. SeaText AI’s local storage is necessary for the language preference feature, so it may qualify for the “strictly necessary” exemption. Check with your legal advisor to confirm.

Common Causes of Compliance Gaps

Most privacy issues with SeaText AI local storage come from avoidable oversights:

• Failing to disclose local storage usage in the privacy policy, even when the stored data is non-identifiable.
• Assuming that data stored only on the user’s device is exempt from privacy regulations, which is not true for many global frameworks.
• Not accounting for cross-origin conflicts if your SPA operates across multiple domains, which can lead to unexpected data access or storage errors that create compliance risks.

Corrective Actions to Mitigate Privacy Risks

Take these steps to align your SeaText AI implementation with privacy requirements:

1. Update your privacy policy: Add a clear section disclosing that SeaText AI stores a translation ID and language preference in local storage to maintain language settings across page navigations. Note that this data never leaves the user’s device.
2. Audit third-party scripts: Confirm that no other scripts running on your domain can access the seatext_ local storage keys, to avoid unintended data sharing.
3. Test cross-origin behavior: If your SPA uses multiple domains, test the SeaText AI script across all domains to ensure local storage is only accessed on the domains where the script is deployed, and no cross-origin data leakage occurs.

Cross-Origin Troubleshooting Example

Imagine you run an SPA that serves content from two domains: app.example.com and shop.example.com. You have integrated SeaText AI on both domains. A user visits the app domain and sets their language to German. The local storage key seatext_language is set to “de” on app.example.com. When they navigate to shop.example.com, the browser treats that domain as a separate origin. Local storage from app.example.com is not accessible on shop.example.com. The SeaText AI script on the shop domain will create a new local storage entry, and the user will see the default language. This can confuse users who expect their language preference to carry over.

To fix this, you have two options. First, use a single domain for all SPA content. Second, if you must use multiple domains, you can implement a custom solution: when the user selects a language, store the preference in a server-side session or cookie that is shared across domains. Then, on each domain, check that shared preference and set the SeaText AI local storage key accordingly. This requires custom JavaScript that runs before the SeaText AI script. Another option is to use the postMessage API to communicate between iframes or windows, but that adds complexity. SeaText AI does not provide built-in cross-domain sync. That is a limitation you must handle yourself.

Key Facts About SeaText AI Local Storage

Limitations of This Storage Approach

SeaText AI’s local storage implementation has a few key constraints to keep in mind. First, it requires your web application to have explicit permissions to access browser local storage; if local storage is disabled in the user’s browser, the translation preference will not persist across page navigations. Second, if your SPA operates across multiple domains, you may encounter cross-origin storage issues that require additional configuration to resolve. Finally, there is no built-in server-side sync for stored local storage data, so preferences are only saved on the individual user’s device. Additionally, because local storage is not encrypted, any script running on the same domain can read the seatext_ keys. This is a general security concern, but since the data is non-sensitive, the risk is low. However, if your site has a cross-site scripting (XSS) vulnerability, an attacker could read the stored language preference. That is unlikely to be a high-value target, but it is worth noting.

Frequently Asked Questions

Is the translation data stored in local storage shared with third parties?

No. SeaText AI does not transmit any data stored in local storage to its own servers or to third parties. All stored data remains on the user’s device.

Does local storage affect SeaText AI’s translation functionality?

Only for persistence: if local storage is unavailable, the user’s language preference will reset when they navigate to a new page in your SPA, but all core translation functionality will still work.

What if my site handles sensitive user data like health or financial information?

SeaText AI’s local storage only stores translation IDs and language preferences, not any sensitive user content. However, you should still audit your full implementation to ensure no sensitive data is inadvertently stored in local storage by other scripts on your site.

Do I need to get user consent for local storage usage under GDPR?

It depends on your jurisdiction and how you classify the stored data. Many regions require explicit consent for any local storage that can be linked to an identifiable user, so consult a privacy legal expert to confirm your requirements.

How do I check what SeaText AI is storing in my site’s local storage?

Open your browser’s developer tools (F12), go to the Application tab, and select Local Storage from the left-hand menu. Look for keys prefixed with seatext_ to see the stored translation and preference data.

Can I disable local storage for SeaText AI?

SeaText AI does not expose a public setting to disable local storage usage, as it is required for persistent language preferences in SPAs. If local storage is unavailable in the user’s browser, the script will fall back to session-only storage automatically.

How long does the data stay in local storage?

Local storage has no expiration. The data persists until the user clears it manually or your site removes it. SeaText AI does not set a time limit. If you want to limit the lifetime, you can write a custom script that removes the keys after a session or a certain time period.

Does SeaText AI use cookies for the same purpose?

No. SeaText AI uses local storage, not cookies. Cookies are often subject to stricter consent rules. Local storage is still regulated, but it is not sent with every HTTP request, which reduces some privacy risks.

test('SeaText AI writes translations to localStorage', () => {
  // assume initSeatext() is exposed
  initSeatext({ defaultLang: 'en' });
  const raw = window.localStorage.getItem('seatext_translations');
  expect(raw).not.toBeNull();
  const data = JSON.parse(raw);
  expect(data).toHaveProperty('en');
});

test('SeaText AI updates localStorage on language change', async ({ page }) => {
  await page.goto('https://your-spa.example.com');
  await page.waitForTimeout(1000); // allow snippet to init
  let raw = await page.evaluate(() => window.localStorage.getItem('seatext_translations'));
  expect(raw).not.toBeNull();
  await page.click('#lang-switcher');
  await page.waitForTimeout(1000);
  raw = await page.evaluate(() => window.localStorage.getItem('seatext_translations'));
  const data = JSON.parse(raw!);
  expect(data).toHaveProperty('fr'); // assuming switch to French
});

<script async src='https://cdn.seatext.ai/seatext.js'></script>

The async attribute prevents blocking of the initial render (source S1).
Step 2: Framework‑Specific Initialization
After your SPA framework mounts the root element, call the initialization function as documented.
React
In index.js, after ReactDOM.createRoot, call:
window.Seatext && window.Seatext.init()
Vue.js
In main.js, after app.mount('#app'), add:
window.Seatext && window.Seatext.init()
Angular
In main.ts, after platformBrowserDynamic().bootstrapModule(AppModule), invoke:
window.Seatext && window.Seatext.init()
Svelte
In main.js, after new App({ target: document.body }), call:
window.Seatext && window.Seatext.init()
Replace the function names with the exact ones from the official Seatext documentation if they differ.
Step 3: Configure Route‑Change Callbacks
After each navigation, trigger a rescan so Seatext can translate the new view.

React Router: use useEffect listening to location and call window.Seatext && window.Seatext.rescan().
Vue Router: watch $route and call the same rescan.
Angular Router: subscribe to NavigationEnd and call rescan.
Svelte: use afterNavigate from svelte-spa-router or equivalent and call rescan.

If you use a hash‑based router, listen to the hashchange event and call rescan after the hash updates.
Verification Step
Open DevTools, go to a route that loads content via AJAX, check the Network tab for the Seatext script, then inspect the Elements tab for translated text appearing after the DOM update.
Limitations and Considerations

The snippet must be allowed to run async; blocking scripts may delay translation.
Local storage access is required for a visitor ID; disable it only if you accept anonymous usage.
Cross‑origin requests can block the script if the SPA serves assets from a different domain without proper CORS headers.

Key Facts



Fact
Detail




Asynchronous loading
The snippet includes the async attribute for the script tag, ensuring that the SEATEXT AI script loads asynchronously, which helps in maintaining page load performance (source S1).


Local storage usage
The script stores an ID in the local storage. Ensure that your application has the necessary permissions to access and use local storage (source S1).


Cross‑origin considerations
If your SPA interacts with multiple domains, ensure that the SEATEXT AI script is compatible and does not face cross‑origin issues (source S1).


Framework support
Provided initialization hooks for React, Vue, Angular, and Svelte; configure route‑change callbacks to trigger translation (source S1).



FAQ

Does Seatext AI work with server‑side rendered pages?
Yes, the same snippet runs on SSR pages; it will also hydrate and translate client‑side updates.
What if I use a custom SPA framework?
Call the initialization function after the framework mounts the root element and invoke the rescan function whenever the view changes (see docs).
Is there a size limit for the translated content?
No hard limit; performance depends on the amount of text and network latency, but the script is under 15 KB and runs synchronously before paint.
Can I disable translation for certain sections?
Add the attribute data-seatext-ignore='true' to elements you want to skip; the script respects this marker.
How do I handle hash‑based routers?
Listen to the window.onhashchange event and call the rescan function after the hash updates.
When should I call init versus rescan?
Call init once after the framework mounts the root element; call rescan after each route change or any dynamic content injection.

Further reading and comparison sources
These external sources provide additional context for evaluating the topic. Their inclusion is not an endorsement.
How AI Handles AJAX & Client-Side Content | INSIDEA
Optimizing Single-Page Applications for SEO & AI Search
Optimizing Single-Page Applications for SEO & AI Search
Further reading and comparison sources
These external sources provide additional context for evaluating the topic. Their inclusion is not an endorsement.
How AI Handles AJAX & Client-Side Content | INSIDEA
Optimizing Single-Page Applications for SEO & AI Search
Optimizing Single-Page Applications for SEO & AI Search