Welcome! I think quality is an underrated characteristic of modern software. In some ways, we have made huge strides as an industry. The average modern web app probably has far fewer bugs than the average software application from 30 years ago. However, as the world of software becomes more and more complex, there are whole new areas that require a quality-first approach as regards design and development. I believe that APIs need this. APIs are becoming the backbone of the internet. They serve external clients for my companies and are increasingly becoming the glue that holds the different internal pieces of modern software systems together.

On the surface, this book is primarily about using the API testing tool Postman, and you will certainly have an in-depth knowledge of it by the end of the book. However, while explaining how to use Postman, I have also sought to provide principles that apply no matter what tool is used. I want you to have more than just the ability to manipulate the tool to do what you want it to. I also want you to be able to know when and how to use the tool so that you can be part of creating high-quality APIs.