To support real-time messaging, I also added Socket. Integrate the chat app with socket io, a WebSocket library, in order to enable client-server communication using WebSockets. It allowed users to directly send messages in real time in their chat. I made the back end in such a way that multiple connections could be handled, thereby I can scale it.
I implemented Redis as a message broker for communication between multiple Socket to scale up io instances across servers. This allows you to create some level of scale so that the app can handle more and more users and traffic without compromising performance. I also established methods to publish events such as new messages or actions taken by users to all clients connected to a chat room. If you optimize for this, you make the chat app stable and ready for the scale of adding more features, like typing indicators and online/offline status tracking.
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