In this chapter, we learned about one of most widely used Node.js frameworks, Express. We discussed its fundamentals, how to set it up, and its main characteristics. The middleware architecture, which we mentioned in the previous chapter, is the base of the library and gives us the power to write complex but, at the same time, flexible applications. The example we used was a simple one. We required a valid session to provide page access. However, it illustrates the usage of the body parser middleware and the process of registering the new routes. We also updated the Jade templates and saw the results in the browser.

The next chapter will show us how Node.js collaborated with AngularJS, a popular framework made by Google for client-side JavaScript applications.