You need both CoffeeScript and Express:
npm install -g coffee-script npm install -g express
Then you can install the dependency node modules:
npm install .
Build the source CoffeeScript files:
And then start the server.
Every five seconds, the server uses Socket.IO to push the current time to the client. The client, on receiving the time, adds it to the page in the form of a new Bootstrap Alert widget.
Jade is a good choice for the template engine, because it doesn't use double curly braces for variable expansion. That means its syntax doesn't get in the way of Angular's.
I've focused on making this as minimal as possible, while still demonstrating the full stack.