The Modern Guide to OAuth
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The Modern Guide to OAuth

About the Book

This guide is different than most of the others out there because it covers all of the ways that we actually use OAuth. It also covers all of the details you need to be an OAuth expert without reading all the specifications or writing your own OAuth server.

This book is based on hundreds of conversations and client implementations as well as our experience building FusionAuth, an OAuth server which has been downloaded over a million times. Learn more about FusionAuth at

About the Author

The FusionAuth Team
Brian Pontarelli and Dan Moore

Brian Pontarelli is CEO and founder of FusionAuth.

Dan Moore is head of developer relations at FusionAuth.

About the Contributors

Matthew Altman
Matthew Altman
Trevor Smith
Trevor Smith

Table of Contents

  • Introduction
    • OAuth overview
  • OAuth modes
    • Which OAuth mode is right for you?
    • Local login and registration
    • Third-party login and registration
    • First-party login and registration
    • Enterprise login and registration
    • Third-party service authorization
    • First-party service authorization
    • Machine-to-machine authorization
    • Device login and registration
  • OAuth Grants
  • Authorization Code grant
    • Login/register buttons
    • Authorize endpoint parameters
    • Logging in
    • Redirect and retrieve the tokens
    • Tokens
    • User and token information
    • Local login and registration with the Authorization Code grant
    • Third-party login and registration (also Enterprise login and registration) with the Authorization Code grant
    • Third-party authorization with the Authorization Code grant
    • First-party login and registration and first-party service authorization
  • Implicit grant in OAuth 2.0
  • Resource Owner’s Password Credentials grant
  • Client Credentials grant
  • Device grant
    • The Problem
    • The Solution
  • Conclusion

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