API Security in Depth

Modern systems live and die by their APIs, yet most breaches start with the basics done wrong: broken authentication, naive rate limits, and blind spots that let abuse scale quietly. This book goes beyond theory to show how attackers actually probe, bypass, and monetize API weaknesses-and how to stop them with designs that hold up under pressure.

Written for engineers, architects, and security leaders, API Security in Depth breaks down complex concepts into clear mental models, concrete patterns, and battle-tested techniques. You'll learn how to design robust auth flows, implement rate-limiting that adapts to real traffic, and detect abuse before it becomes an incident. Each chapter connects strategy to implementation, with practical examples, common pitfalls, and decision frameworks you can apply immediately.

Inside, you'll discover how to:

• Design authentication and authorization that scale without collapsing under complexity

• Choose and implement rate-limiting strategies that balance safety, performance, and user experience

• Detect, classify, and prevent API abuse-from credential stuffing to business-logic attacks

• Build layered defenses that assume attackers are persistent, automated, and smart

• Future-proof your APIs against evolving threats without slowing down development

Whether you're securing a startup's first public API or hardening a global platform handling billions of requests, this book gives you the clarity and confidence to defend what matters most. API Security in Depth isn't just about protecting endpoints-it's about protecting your product, your users, and your business.