In this chapter, we learned how to create a fairly complete Express app from the ground up. We started by demonstrating the fact that Express are Node modules. Then we went on to create a simple app, upon which we added more and more components and features to make it more complex. By the end of the exercise, we had an app that could run on different modes depending on the environment.
We now have a good amount of knowledge to make sense of an auto-generated Express app.
Since routes are the public interfaces to an app, they make it a natural topic to focus on next. We will learn in detail about routes in Express in the next chapter.