sahil63604-sudo/chat-application ? reverse-engineered prompt

Build me a simple full stack chat app where people can send and receive messages in real time, see who sent each message, and view timestamps next to the messages.

I want a clean, responsive interface that works well on desktop and mobile, with a chat area, a message input, and a clear chat option. The app should use a React frontend and a Node plus Express backend, with MongoDB for saving messages so the chat history stays there after refresh. Please make sure the frontend talks to the backend through REST APIs and real time communication so messages update instantly without reloading.

Use the existing project structure if it helps, and make the app feel polished but simple. If you need to check current docs or best practices while building, go ahead and look them up online.