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oauth2

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Tutorial

FastAPI Auth: OAuth 2.0 — The Authorization Framework

OAuth 2.0 is not authentication — it is authorization. Here are the four grant types, why PKCE is now mandatory, and how to implement the authorization code flow in FastAPI with working code and sequence diagrams.

9 min read
Tutorial

FastAPI Auth: OpenID Connect and Single Sign-On

OAuth 2.0 does not tell you who the user is. OpenID Connect adds the identity layer. Here is how to implement Google SSO, validate ID tokens, and understand when OIDC beats SAML.

9 min read