sumitgupta9579-blip/MERN_STACK ? reverse-engineered prompt

Build me a complete MERN stack web app with a clean React frontend and a Node Express backend connected to MongoDB.

I want it to feel like a real starter project I can run locally, with a simple modern interface on the client side, an API on the server side, and the two wired together properly. Include the usual basics like a few working pages, forms, data saving and loading, and a nice structure that is easy to understand and extend later.

Please also set up the backend so the main routes are organized well, and add a Postman collection or examples so I can test the API easily. If anything is unclear, use sensible defaults and look up current docs online if you need to. Make sure the app is polished enough to use as a solid full stack example, not just a bare demo.