sonamsontakke/MernUserAuth ? reverse-engineered prompt

Build me a simple full stack user auth app for learning.

I want a frontend and backend set up so a user can sign up, log in, and log out, with a clean simple UI and basic form validation. Please make it feel like a real starter project I can learn from, with the frontend talking to the backend and handling success and error states clearly.

Keep it easy to run locally, and organize the code in a way that makes sense for a beginner. If you need to check current docs or best practices while building it, go ahead and look them up online. I’d also like the app to be easy to extend later, so please include the basics for protected pages and keeping users signed in if that fits naturally.