When Next.js API Routes work in development but return a 404 error in production, there are several common reasons for this issue. Here are some possible causes and their solutions:

  1. API Route Not Properly Defined: Ensure that your API route is correctly defined in the pages/api directory and follows the correct file naming convention, such as my-api-route.js for a route accessible at /api/my-api-route. Make sure the file name matches the expected route URL.

  2. Case Sensitivity: Check the case sensitivity of the API route file name and URL. Some hosting environments are case-sensitive, so make sure the URL path matches the file name exactly.

  3. Next.js Server Not Running: Ensure that your Next.js server is running in production mode. You can start the production server using the following command:

    npm run build npm start

    If you are using next start for production, make sure it is run on the correct port (default: 3000) and accessible to the public.

  4. Routing Configuration: If you are using custom server configurations or proxy settings, ensure that they are correctly set up for production. Improper configurations can cause issues with API route handling.

  5. Build Issues: Verify that your Next.js application builds without any errors or warnings. Check the build logs to see if there are any issues related to the API routes.

  6. Environment Variables: If your API routes rely on environment variables, ensure that they are correctly set in the production environment.

  7. Deployment Path: If you are deploying your Next.js application to a subdirectory or a custom path, make sure that the API routes' URLs are adjusted accordingly.

  8. Reverse Proxy: If you are using a reverse proxy in your production setup, ensure that it is correctly configured to forward requests to the Next.js server for API routes.

  9. File System Routing: If you are using file-system routing with a custom server, verify that the routing logic is correctly set up for production.

  10. Caching or CDN: If you are using caching or a Content Delivery Network (CDN), make sure that it is not caching the 404 responses.

  11. Static Hosting: If you are hosting your Next.js application on a static hosting service, ensure that the hosting environment supports server-side rendering and API routes.

To troubleshoot the issue, it's essential to check the production build logs and examine any server-side or deployment configurations specific to your environment. Additionally, consider testing your application on a different production server or hosting environment to see if the issue persists.

If you're unable to resolve the issue after trying these solutions, consider reaching out to the Next.js community or support for further assistance.

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