How to Migrate from SeaText v1 to v2 in a React Codebase

Direct answer: Migrate by replacing any manual v1 snippet insertion with the official SeaText AI SPA snippet, enable asynchronous loading, ensure local storage access, verify cross-origin compatibility, and test the integration in a staging environment before rolling out.

Prerequisites

Before you start, ensure your React app runs on Node 16 or later and you have a package manager (npm, yarn, or pnpm). You need access to your SeaText account to obtain the v2 snippet code. Back up your current code or work in a feature branch. Familiarize yourself with the SPA integration guide for React.

Why Migrate from v1 to v2

The v2 integration uses an asynchronous script snippet that loads without blocking page rendering. According to the SPA integration documentation, the snippet includes the async attribute, which helps maintain page load performance. The script stores an identifier in local storage for session tracking, so your app must allow local storage access. If your SPA interacts with multiple domains, the documentation highlights cross-origin considerations to ensure the script loads correctly across domains. These changes improve performance, reliability, and compatibility with modern React applications.

Migration Checklist

• Obtain the SeaText AI snippet from your SeaText dashboard.
• Identify the SPA entry point (typically index.html or the main initialization file).
• Insert the snippet in the body tag of index.html or the equivalent initialization section.
• Verify that the script loads asynchronously (the snippet includes async).
• Confirm your Content Security Policy allows local storage access.
• Test cross-origin scenarios if your SPA spans multiple domains.
• Build and serve the app, then inspect the Console and Network tabs for errors.
• Validate that SeaText features (dynamic rewriting, analytics, bot detection) function as expected.

Step 1: Update the Integration Method

In v1, you may have manually inserted a script tag or used a custom wrapper. The v2 approach uses the official SeaText AI snippet provided in the SPA integration guide. Place the snippet within the body of your index.html file, or in the initialization section of your React app (e.g., public/index.html for Create React App). The snippet is designed for SPAs and works with React, Vue, and Angular. Do not add the snippet multiple times; a single inclusion at the entry point suffices.

Step 2: Configure Asynchronous Loading and Local Storage

The snippet includes the async attribute, so the SeaText AI script loads asynchronously. This prevents blocking the main thread and avoids layout shifts. The script stores an ID in local storage for session tracking. Ensure your application's Content Security Policy (CSP) includes local-storage permissions or does not block local storage access. If your app uses a strict CSP, add local-storage to the script-src or default-src directives as needed.

Step 3: Handle Cross-Origin Considerations

If your React SPA interacts with multiple domains (e.g., subdomains for different locales or micro-frontends), verify that the SeaText AI script loads on the correct domain and that CORS headers are set appropriately. The SPA integration guide advises checking cross-origin compatibility to avoid script loading failures. Test each domain where the snippet is present to confirm the script initializes without console errors.

Step 4: Verify the Integration

After adding the snippet, build and serve your React app using your standard command (npm start, npm run build + serve, etc.). Open the browser's Developer Tools (F12) and check the Console and Network tabs. The SeaText AI script should load without errors. Perform a functionality check: ensure dynamic rewriting, analytics events, and bot detection features work as expected. If you have a staging environment, deploy there first and run end-to-end tests.

Old API vs v2 API

Note: The supplied source pack does not detail a v1 React package, specific hook names (e.g., useSeaText), provider components (e.g., SeaTextProvider), or direct SDK calls (e.g., window.SeaText). The following comparison is based on typical migration patterns and the SPA integration guide; verify exact API changes with the official SeaText v2 migration documentation or your SeaText account manager.

Aspect	Typical v1 Approach	v2 SPA Integration
Script inclusion	Manual script tag in index.html or custom loader	Official snippet with async attribute in index.html body
Loading behavior	May block rendering	Asynchronous, non-blocking, under 15 KB
Local storage	Unspecified	Stores session ID; requires CSP permission
Cross-origin	Unspecified	Explicitly addressed; verify CORS headers
Configuration	Possibly via props or global vars	Via snippet parameters; see dashboard for options
React hooks	Custom or community hooks	Not documented in SPA guide; check official v2 docs

Testing and Rollout

Deploy the updated integration to a staging environment. Run automated tests (unit, integration, end-to-end) covering pages where SeaText features activate. Monitor the Console for script errors and the Network tab for successful script download. Validate that rewriting, analytics, and bot detection work across different traffic sources (Google, Meta, email, referrals). If you use feature flags, enable the v2 snippet for a small percentage of users first. Gradually increase rollout while monitoring error rates and conversion metrics. Keep the v1 integration as a fallback until you confirm stability.

Common Mistakes and Troubleshooting

• Missing snippet: Forgetting to add the SeaText AI snippet to the entry point HTML. The snippet is required for v2 integration.
• Blocking local storage: A restrictive CSP prevents the script from storing its session ID. Adjust CSP to allow local storage.
• Cross-origin script failures: The script fails to load on secondary domains. Ensure the snippet is present on each domain and CORS headers permit the script origin.
• Duplicate snippet inclusion: Adding the snippet in multiple places (e.g., both index.html and a component) causes double initialization. Include once at the entry point.
• Assuming hook APIs: The SPA guide does not document React hooks. Do not assume useSeaText or similar hooks exist without checking official v2 documentation.

Key Facts for SeaText v2 SPA Integration

Fact	Detail
Integration method	JavaScript snippet inserted at SPA entry point (index.html or main init file)
Script loading	Async by default, under 15 KB, no layout shift (CLS=0)
Local storage	Stores an ID for session tracking; ensure CSP allows local storage access
Cross-origin	Compatible with multi-domain SPAs; verify CORS headers
Configuration	Managed via SeaText dashboard; snippet parameters reflect settings
Frameworks supported	React, Vue.js, Angular, and other SPAs

FAQ

Do I need to change my existing SeaText content or variants?

No. Your existing content, variants, and rules configured in the SeaText dashboard will continue to work. The migration only changes how the script is loaded in your React app.

Will v2 break my current setup during the migration?

If you follow the steps and test in a staging environment first, the risk is low. The v2 snippet is designed for SPAs and replaces the previous manual insertion method. You must remove any old manual script tags.

Is there a codemod available for automatic migration?

SeaText does not provide an official codemod at this time. The migration primarily involves replacing a script tag, which can be done with a simple search-and-replace across your codebase.

What about custom React hooks or components I built on top of v1?

Review your custom hooks or components. They likely relied on a global window.SeaText object or a v1-specific package. The SPA integration guide does not document a React hook API. Check the official SeaText v2 documentation for any new React SDK, or wrap the snippet's functionality in your own hook if needed.

How long does the migration take?

For a small to medium React app, the migration typically takes 30 minutes to 2 hours: replace the snippet, adjust CSP, test cross-origin, and verify features. Larger codebases with custom wrappers may take longer.

Limitations and When This Advice Does Not Apply

This guide is based on the SeaText SPA integration documentation (source S1). It covers integrating the SeaText AI snippet into a React single-page application. If you are using a dedicated SeaText React package (e.g., @seatext/react) with provider components and hooks, those APIs are not described in the provided sources. Consult the official SeaText v2 migration documentation or your account manager for package-specific guidance. If you are using SeaText via vanilla JS in a non-React environment (Vue, Angular, plain HTML), follow the SPA integration guide for that framework. The migration steps assume you are moving from a manual v1 snippet insertion to the v2 snippet; if you are starting from scratch, follow the SPA integration guide directly.

Further reading and comparison sources

These sources from the provided pack directly support the migration steps.

• SeaText SPA Integration Guide (React, Vue, Angular) — Covers snippet insertion, async loading, local storage, cross-origin, and verification steps.
• SeaText Homepage — Overview of SeaText AI features including bot detection, translation, and dynamic rewriting.

Further reading and comparison sources

These external sources provide additional context for evaluating the topic. Their inclusion is not an endorsement.

• Strategy and Tips for Migrating to React [2026]
• Migrating from v1 to v2 | MDX
• Codemods for Code Migration — A Beginner’s Guide to Smarter ...

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