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I’m trying to deploy my full MERN project (frontend + backend) on Vercel. The frontend works fine, but the backend is not loading data. I keep getting this error in the console:

GET https://cutomer-management-react-node.vercel.app/api/customers 404 (Not Found)

  1. Backend is built with Express.

  2. Both frontend and backend are in the same repository.

  3. I tried many solutions (adjusting routes, using environment variables, checking CORS), but nothing worked.

  4. I managed to get the frontend working correctly, but the backend still fails.

Repo: https://github.com/Safeya-Yasien/cutomer-management-react-node
Demo: https://cutomer-management-react-node.vercel.app/

asked Nov 10, 2025 at 9:48

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