OAuth 2.0 Simplified Book Cover

OAuth 2.0 Simplified

Fourth Edition, updated November 2021


OAuth 2.0 Simplified is a guide to building an OAuth 2.0 server. Through high-level overviews, step-by-step instructions, and real-world examples, you will learn how to take advantage of the OAuth 2.0 framework while building a secure API.

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The Nuts and Bolts of OAuth 2.0

This course covers OAuth 2.0, OpenID, PKCE, deprecated flows, JWTs, API Gateways, and scopes. No programming knowledge needed!

This course covers each of the OAuth flows and applies them to use cases such as implementing OAuth for web apps, native apps, and SPAs. In addition to learning how applications can use OAuth to access APIs, you’ll learn how to use OpenID Connect to get the user’s identity.

If you're building an API, you'll learn the differences and tradeoffs between different access token formats, how to choose an appropriate access token lifetime, and how to design scopes to protect various parts of your APIs.

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The Little Book of OAuth 2.0 RFCs

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This reference guide will help you understand the context of each RFC that is part of OAuth.

This book is a reproduction of all the RFCs relating to OAuth, everything from OAuth core RFC6749 to the latest Security Best Current Practice. Each RFC is prefaced by a short introduction to set the context for why it's important to the space.

Why OAuth?

The OAuth 2.0 authorization framework has become the industry standard in providing secure access to web APIs. OAuth allows users to grant external applications access to their data, such as profile data, photos, and email, without compromising security.

Whether you’re a software architect, application developer, project manager, or a casual programmer, this book will introduce you to the concepts of OAuth 2.0 and demonstrate what is required when building a server.

About the Author

Aaron Parecki is a Senior Security Architect at Okta with over two decades of experience in the industry. He is the author of OAuth 2.0 Simplified, and maintains oauth.net. He has been invited to speak at events around the world about OAuth, online security, privacy and data ownership. He is a regular contributor to several specs at the IETF including OAuth 2.1 and GNAP.

Aaron is the co-founder of IndieWebCamp, a yearly worldwide conference on data ownership and online identity. His work has been featured in Wired, Fast Company, and made Inc. Magazine’s 30 Under 30 while building a startup that was later acquired. Aaron holds a B.S. in Computer Science from University of Oregon and lives in Portland, Oregon.

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