vishnuvardhankakara21/mern-realtime-chat ? reverse-engineered prompt

Build me a full stack chat app where people can sign up, log in, and start chatting right away.

I want it to support one to one messages and group chats, with messages updating instantly without refreshing the page. Please include real time notifications too, plus the usual API support for creating users, conversations, and sending messages. Make the app feel clean and easy to use, with a simple modern interface on the frontend and a solid backend that stores data in a database.

Use a MERN style setup with React on the client, Node and Express on the server, MongoDB for storage, and Socket.IO for the live messaging part. JWT based login should protect the chat features. If you need to check current docs for anything, feel free to look them up online.

Please make it work end to end, and keep the code organized so it would be easy to extend later.