Who this book is for
Although pentesting APIs can be useful to junior and novice enthusiasts, it will be especially valuable to medium-level to experienced penetration testers, since you will preferably have a good foundation on cybersecurity concepts such as enumeration, discovery, and pentesting. Some knowledge about higher-level programming languages, such as Python and Golang, is also advised.
With that being said, this book is for security engineers, analysts, application owners, developers, pentesters, and all enthusiasts who want to learn a bit more about APIs and successful ways of testing their robustness.