How to Migrate i18n from Vite to Next.js Without Hydration Errors
Migrating a React app from Vite to Next.js requires a fundamental shift in how internationalization (i18n) is handled, moving from a client-side model to a server-first approach. In Vite SPAs, translations are managed client-side via hooks, while Next.js uses URL-based sub-path routing such as /en/about to help search engines index localized pages. Developers must use middleware to detect user locale and redirect accordingly, replacing reliance on localStorage or browser APIs during initial render. A common pitfall is the hydration mismatch error, which occurs when the server and client render different languages — this can be avoided by ensuring server-side locale detection is consistent throughout the render cycle. Libraries like next-intl are recommended for the App Router, enabling translations to be fetched inside Server Components and reducing the JavaScript bundle sent to the client.
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