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APIs are the bloodstream of modern software. Every microservice call, every third-party integration, every mobile app request, and every AI agent invocation flows through an API. They are also the fastest-growing attack surface in enterprise IT. This book provides a comprehensive, authoritative guide to securing APIs from design through deployment to production operation. It covers authentication and authorization frameworks, cryptographic protections, threat modeling, the OWASP API Security Top 10, secure coding practices, infrastructure security, testing methodologies, governance, compliance, and emerging frontiers including zero-trust architectures, AI-enabled APIs, and the Model Context Protocol. Every chapter is grounded in established standards from OWASP, NIST, IETF, and ISO, with practical code examples in Java, Go, Python, JavaScript/TypeScript, C#, Rust, and Kotlin. Whether you are a developer building your first REST endpoint or a security architect designing an enterprise API platform, this book gives you the knowledge to build APIs that are secure by design and resilient under attack.

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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