Overview

Designing and Testing RESTful APIs with OpenAPI and Postman: Build RockSolid API Contracts, Automate Schema-Based Testing, and Stop Regressions Before They Ship APIs are the backbone of modern software, but making them reliable, consistent, and testable before they reach production is a constant struggle. A small schema change, a missing field, or an undocumented response can break integrations and erode trust faster than any bug in your code. How do you stop regressions before they ship-and build APIs your team and your users can truly rely on? Designing and Testing RESTful APIs with OpenAPI and Postman gives you the practical workflow to do exactly that. By combining the precision of OpenAPI contracts with the power of Postman's automated testing, this book shows you how to enforce quality at every stage of the API lifecycle. It's not about theory-it's about working code, executable tests, and pipelines you can set up today to ensure your APIs stay rock solid. Inside, you'll learn how to: Write clean OpenAPI 3.1 specifications that act as a single source of truth. Generate server stubs and client SDKs to move from design to working code in minutes. Use Postman to create schema-based tests that validate responses automatically. Run contract tests, regression checks, and changelogs that prevent breaking changes from slipping through. Automate everything in CI/CD pipelines with tools like Newman, Spectral, and oasdiff-so every commit is validated before release. Strengthen security with spec-driven checks and continuous scanning. Improve error handling and API governance to keep your services consistent as they evolve. With real-world examples, executable commands, and copy-paste-ready code snippets, this book equips you to design, test, and ship APIs that scale safely and confidently. Whether you're a junior developer building your first service or a senior engineer leading an enterprise team, you'll gain the skills to stop firefighting regressions and start shipping features faster. If you've ever dealt with flaky API tests, breaking integrations, or specs that don't match reality, this book is your playbook for fixing it. Learn to build APIs that are trusted, enforceable, and production-ready-because the best developer experience is delivering reliability from day one. Stop shipping regressions. Start shipping confidence. Get your copy today and build APIs that never drift from their contract

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