Overview

OAuth 2.1 in Practice is a hands-on, production-focused guide to designing, implementing, securing, and operating modern authorization systems for APIs, SPAs, mobile apps, and cloud platforms. This is not a protocol overview or a theory-heavy reference. It is a build-first, operator-grade manual for engineers who need OAuth to work correctly under real-world conditions-multi-tenant SaaS architectures, public clients, gateways, policy engines, key rotation, abuse scenarios, and compliance pressure. You will learn OAuth 2.1 the way it must be implemented today: Authorization-first, login-second-with a clean separation between OAuth and OpenID Connect Authorization Code + PKCE everywhere for public clients Least-privilege scopes, audiences, and tenant isolation that map to real APIs Gateway- and policy-driven enforcement using modern patterns Refresh token rotation, replay detection, and sender constraints (DPoP, mTLS) Rotation-safe key management, observability, and incident readiness Threat testing, negative testing, and release gates that prevent silent failures The book walks you step by step from foundational mental models to a full-stack end-to-end capstone: an OAuth 2.1 platform powering a modern SaaS API with SPA and mobile clients, a gateway, policy engine, and production controls. Every chapter includes practical labs, and the capstone validates the system through abuse simulations, break-glass recovery drills, and operational runbooks. You will not find outdated flows, insecure shortcuts, or vendor lock-in. The patterns are 2026-ready, standards-aligned, and intentionally conservative where security matters most. Who This Book Is For API, backend, and platform engineers Frontend and mobile developers implementing secure login and API access DevOps and SREs operating OAuth platforms at scale Security engineers reviewing or hardening OAuth deployments Architects designing multi-tenant, cloud-native systems If you have ever struggled with broken logins, confusing tokens, random logouts, failed key rotations, or OAuth setups that ""work until they don't,"" this book is for you. OAuth 2.1 in Practice gives you a repeatable architecture, a testing mindset, and an operational playbook-so authorization becomes a dependable foundation, not a recurring incident.

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