Here I have implemented the oAuth2 standard to login the user with their google account.

For the real-time chat experience, a Web-socket library named Socket.io was used.

To save the previous chats, MongoDB Atlas was used.

Authorization with oAuth2.0

Saving previous chat history using MongoDB

Handling user requests using Express.js and Socket.io

User can login and logout of the chat

A list of Online users in the group chat