All Postman & API Testing Books
3API Testing and Development with Postman
Dave Westerveld · Packt · 359 pages · ~9 hrs to read
The best book-form treatment — combines testing theory (what to assert, how to design suites) with Postman execution, including contract testing and workflow automation. Good for engineers who want testing craft, not just tool clicks.
RESTful Web APIs
Leonard Richardson, Mike Amundsen, Sam Ruby · O'Reilly · 464 pages · ~12 hrs to read
Broadens past Postman into the API design theory that determines whether there is anything good to test — hypermedia, resource modelling, and why most "REST" APIs aren't. Read this to understand what a well-designed endpoint looks like before you script assertions against it.
Designing Web APIs
Brenda Jin, Saurabh Sahni, Amir Shevat · O'Reilly · 232 pages · ~6 hrs to read
Written by Slack platform engineers with case studies from Stripe, Facebook, and GitHub — covers API-first design, versioning, and developer experience decisions that shape what you end up testing and documenting in Postman collections.
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