As you might remember from Chapter 3, Building an Express Web Application, your application's structure depends on the complexity of your application. We previously decided to use the horizontal approach for the entire MEAN application; however, as we stated before, MEAN applications can be constructed in various ways, and an AngularJS application structure is a different topic, which is often discussed by the community and the AngularJS development team. There are many doctrines for different purposes, some of which are a bit more complicated, while others offer a simpler approach. In this section, we'll introduce a recommended structure. Since AngularJS is a frontend framework, you'll use the public folder of our Express application as the root folder for the AngularJS application so that every file is available statically.

The AngularJS team offers several options to structure your application according to its complexity. A simple application will have...