Express is a fantastic framework for writing server-side JavaScript. In this walkthrough, I discuss setting up a new express app and configuring git and npm. For newbies, I've ensured that all my code snippets will work (at least on a macbook). If you're more experienced, I encourage you to check out the Pro Tips that are sprinkled throughout.
I've been developing this tutorial in a Dropbox Paper document. I'll copy it over to this README soon, and in the meantime you can check it out here.