Chapter 4 and 5 help to build the bridge to the later and more advanced topics by introducing several notions of code modularization and raising the sensitivity for separating presentational from data/logic layers of an application. When passing by this stuff, you also get a grasp of how popular frameworks, like Angular, Riot, or Backbone, incorporate those mechanisms. Chapter 4 guides you through the stages of planning, coding and deploying a tiny app with Node, Grunt and Browserify, while chapter 5 also introduces the synergy of Node and Express.
The remaining five chapters cover topics that almost every application has to deal with eventually, namely access control, logging, REST, feature toggle and internationalization. Unfortunately, those chapters get shorter and shorter until the last one, which only spans three pages. That’s a little drop of bitterness. Having said that, the author still dismisses the reader with a solid foundation in current web development techniques and enough knowledge to deepen the desired subjects individually.