Would I share an in depth tutorial on AskUbuntu.com or submit to Ubuntu.com?
I ask because I recently created a lengthy tutorial on how to setup your Node.js / MongoDB local environment(from source), make a simple app with it, and then deploy it with Juju. It is a twelve page how-to(broken into 3 parts) and accompanied by a video series. In case further look is required, details on it are at YouTube.com.