yogendra-chouhan-2003/MERN-auth ? reverse-engineered prompt

Build me a simple full stack login and signup app with a clean front end and a backend API. I want users to be able to create an account, sign in, stay logged in, and log out safely. Add basic form validation and clear error messages for things like wrong password or missing fields.

Make it feel polished and easy to use, with a simple dashboard or welcome page after login. Use whatever setup makes sense for a MERN style project, and organize the backend and frontend so it’s easy to run and test locally. If you need to check current docs online for any auth library or best practice, go ahead.