NOTE: Requires Express 3.x / Not compatible with Express 4.x
Ninja Store is a very simple Express.js app for you to hack around and uderstand Express better.
It is a good project to start learnig Express because if covers GET and POST requests, the Jade template engine, the Stylus CSS engine, login-logout, and sessions. All of it while being a tiny project.
My book, Express Web Application Development is available now - http://expressjs-book.com/