swayamjaiswal775-lang/Syntecxhub_Chat_Application ? reverse-engineered prompt

Build me a simple real time chat app where people can join or create a room with a username, send messages instantly, and see everyone else who is in the room. I want the chat messages to update live without refreshing, and I want the message history to be saved so when someone joins a room they can see what was already said. Please make it with the MERN stack and Socket.io, and keep the app clean and easy to use.

I’d like a basic frontend and backend setup that can run locally, plus the app should be ready to connect to MongoDB for storing chat history. Make sure the room list, usernames, and live users all work properly. If you need to check current setup details or best practices, look up the docs online and then wire everything up in a way that’s easy to start and deploy.