FastAPI Authentication Guide

FastAPI applications can add user authentication through the PropelAuth FastAPI library using FastAPI’s dependency injection system, allowing routes to require a validated user with minimal code and returning a 401 error for unauthorized requests. Setup involves creating a PropelAuth project, configuring authentication settings and test users in its dashboard, installing the required packages, storing the PropelAuth URL and API key in environment variables, and initializing authentication when the application starts. Access tokens are JWTs whose validation metadata is retrieved during initialization, enabling subsequent local validation without external requests. Protected endpoints can access injected user information such as user IDs, while B2B applications can use organization membership checks to restrict data by organization. FastAPI’s interactive API documentation can test authenticated endpoints by accepting access tokens, and PropelAuth provides hosted account-management flows plus support for organization features, invitations, enterprise SSO, SAML, and SCIM.

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