The book “JSON at Work” by Tom Marrs, it is a great introduction on how to create and use JSON.
It covers topics on how to quickly set up a test server in various languages. A quick introduction to the JSON Format.
I really liked the part that goes really in detail into JSON-Schema
In the last part of the book it goes into JSON in the Enterprise, that part I mostly skipped as it was not very relevant for me.
I can recommend this book if you have had little or no experience working with JSON it is a great introduction to the subject.