The Modern Guide to OAuth 2.0: Beyond the Specs

This isn't just another OAuth 2.0 guide; it's a deep dive into real-world OAuth usage based on the experience of building FusionAuth, an OAuth server with over a million downloads. The guide details eight common OAuth modes, including local login, third-party login, enterprise login, service authorization, and machine-to-machine authentication, explaining each mode's workflow and security considerations. It also delves into the authorization code grant, PKCE, JWTs, token refresh, and user info retrieval, offering practical implementation advice.