testing-api-authentication

Testing FastAPI endpoints with Clerk JWT authentication involves validating RS256 token verification, running end-to-end tests with real Clerk session tokens, and checking 401 error handling. Load environment variables from .env.local before startup, generate fresh session tokens (not Client API tokens), and use provided test scripts to verify token expiry and audit logging attribution.

Clerk session tokens are JWT credentials intended for authenticating end users and are what your FastAPI endpoints expect during testing. Client API tokens are for backend server-to-server communication and will fail authentication validation. Always use session tokens when testing protected endpoints to ensure realistic test coverage.

Yes. This Skill covers validating token expiry behavior and ALCOA+ audit logging through end-to-end tests using real Clerk tokens. Test scripts verify when tokens expire, confirm proper error responses, and trace authentication events to ensure audit attribution is correctly recorded for compliance.

Troubleshoot 401 errors by verifying RS256 signature validation, confirming .env.local loads correctly before startup, and checking that you're passing valid Clerk session tokens in request headers. Use the provided test scripts to isolate whether failures stem from token generation, expiry, environment setup, or endpoint configuration.

Load Clerk credentials and configuration from .env.local before application startup. Ensure compatibility with your Clerk template settings and have token generation and testing scripts ready. Verify that session token creation and RS256 verification dependencies are properly configured in your FastAPI application.

Yes. This Skill includes running end-to-end tests using real Clerk tokens against your FastAPI endpoints, validating authentication paths, monitoring audit trails, and confirming proper error handling for invalid and expired tokens in production-like conditions.