There are various libraries that let you create a ws server (similar to how express lets you create an HTTP server)

1. https://www.npmjs.com/package/websocket
2. https://github.com/websockets/ws
3. https://socket.io/

We’ll be using the ws library today.

<aside> 💡 Problems with socket.io - Even though socket.io is great (it gives you constructs like rooms to make the API much cleaner), it’s harder to support multiple platforms in it (Android, IOS, Rust) There are implementations in most platforms but not very up to date https://socket.io/blog/native-socket-io-and-android/ https://github.com/1c3t3a/rust-socketio

</aside>