Testing an Existing API

APIs come in all shapes and sizes. I have tried to give you a few different APIs to practice on as you’ve worked your way through this book. If you have worked through the various examples and challenges in this book, you should have a pretty good idea of how to use Postman with various types of APIs. In this chapter, though, I want to get you thinking about how you can use Postman to test an existing API.

Although new APIs are being created every day, the reality is that there are a lot of APIs out there that do not have adequate tests. You might be working on one of those APIs. I was recently working on a project that was under a tight deadline and, to meet this deadline, we had to leave some of the API tests until later. It can be a bit overwhelming to have to go back and add tests to an API that already exists and so, in this chapter, I want to walk you through a case study where you can see examples and practice testing existing APIs. These...