I've been use node.js for the server part of my browser multiplayer game. It's been a great decision due to the amount of shared code I have between the client

I've been use node.js for the server part of my browser multiplayer game. It's been a great decision due to the amount of shared code I have between the client and server. For example, I share the physics code which is responsible for controlling the simulation that runs on both the server (authoritative) and clients (for predictions). I no longer have to switch languages which also saves a lot of time!