uws-reverse-proxy is an easy-to-use 0-dependency* reverse proxy based on uWebSockets.js I created to solve a problem I encountered recently for one of my clients.
This package enables use of uWebSockets.js and any HTTP server on the same port in a matter of seconds and fewer than
ten lines of code 
When it comes to websockets the first package name that pop out of our mind in the NodeJS ecosystem is... Socket.IO. I would be very surprised if you were surprised!
The thing is that Socket.IO is one of the less efficient solutions when it comes to performances. The different wrappers it's based upon just add a tremendous overhead to websocket handling, and still has opaque to non-existent backpressure management as it can be seen in issues #3158 and #4435.
Many other alternatives exist, but when performances start to be a major concern, you must find something more efficient. That's why I would want to introduce you to uWebSocket.js!