subh-7755/Docker-compose_MERN ? reverse-engineered prompt

Build me a simple MERN app that runs with Docker Compose.

I want a React frontend, a Node and Express backend, and MongoDB, all connected so I can start everything with one command and open the app in the browser. The frontend should load on localhost 5173, the backend should run on localhost 5050, and the database should be wired up through Docker networking. Make it easy to run locally, with clear setup in the README and a compose file that brings up the full stack without extra steps.

If you need to, look up the current docs online so the Docker setup is solid. Keep it straightforward, just a basic working starter project, not a huge app, but make sure the containers can talk to each other and the frontend can reach the API.