In this chapter, you learned the importance of REST APIs in the web world. Now you are able not only to use them, but also write your own REST APIs, which has turned you into a more resourceful developer. You can also integrate your applications with third-party APIs to give more features to your users, and for making your websites more interesting and useful.

In the next and last chapter, we will end this book discovering a type of testing other than unit testing: behavioral testing, which improves the quality and reliability of your web applications.