vmvansh27/auradrop-mern-backend ? reverse-engineered prompt

Build me the backend for an app called AuraDrop. I want a clean MERN style server that I can run locally, connect to MongoDB, and use as the API for the frontend.

Please set it up so it has a simple and solid structure, with clear routes, controllers, models, and middleware. I’d like basic authentication, a few example CRUD endpoints, and good error handling so it feels ready for a real project. Make sure it includes environment variable setup, database connection, and a straightforward way to start and test it.

If anything needs current best practices or library details, feel free to look up the latest docs online. Also add short setup notes so I know how to install dependencies, configure the app, and run it without guessing.