next.js – Swiper thumbnail navigation do not work in build mode work in dev mode react next js application

If your Swiper thumbnail navigation works in development mode but not in production (build) mode in your Next.js application, there could be a few reasons for this discrepancy. Here are some common troubleshooting steps you can take:

1. Check for Console Errors:
   Open the browser console (usually by pressing F12 or right-clicking on the page and selecting “Inspect” then navigating to the “Console” tab) and look for any error messages. This may give you clues about what’s going wrong.
2. Ensure Assets are Included:
   Sometimes, in production builds, assets may not be properly included. Make sure that the Swiper and its dependencies are being bundled correctly. Check the network tab in your browser’s developer tools to see if the necessary files are being loaded.
3. Review Next.js Configuration:
   Check your Next.js configuration and make sure that any necessary configurations for asset handling, such as image optimization or custom webpack configurations, are set up correctly. Next.js might behave differently in development and production modes.
4. Environment Variables:
   Ensure that any environment variables or configurations used by Swiper, especially those related to paths or URLs, are correctly set for production.
5. Differences in Node.js Environment:
   The development server may have some differences from the production server. Check if there are differences in the Node.js environment between development and production, and if so, try to replicate them in development.
6. Dynamic Imports:
   If you are using dynamic imports or lazy loading for components, ensure that it is set up correctly for production. Sometimes, issues arise with dynamic imports during the production build.
7. Optimizations:
   Check if any aggressive optimizations performed during the production build are causing issues. You can try disabling some optimizations one by one to identify the culprit.
8. Update Dependencies:
   Ensure that all your dependencies, including Next.js and Swiper, are up to date. Sometimes, compatibility issues may be resolved by updating to the latest versions.
9. Browser Cache:
   Clear your browser cache before testing the production build. Sometimes, old assets might be cached and cause unexpected behavior.
10. Build Locally:
    Build your Next.js application locally, and check if the issue persists. This can help identify whether the problem is related to the production build process or something specific to your deployment environment.

By systematically going through these steps, you should be able to identify and resolve the issue causing the Swiper thumbnail navigation problem in the production build of your Next.js application.