Security & Testing

Authentication, authorization, and testing for production APIs. This section covers securing your FastAPI application with JWT tokens and OAuth2, then validating everything with automated tests.

Topics

• JWT Fundamentals — Token structure (header.payload.signature), Base64URL encoding, HMAC (HS256) and RSA (RS256) signing algorithms

• OAuth2 Framework — OAuth 2.0 authorization flows for delegating access without sharing credentials, combined with OpenID Connect for authentication

• Google OAuth2 Authentication — Integrating Google as an OAuth2 provider with redirect flows and the google-auth-oauthlib library

• Authentication Patterns — Implementing complete authentication in FastAPI: JWT issuance, OAuth2PasswordBearer, AuthServer, and route protection

• Unit Testing — Testing FastAPI endpoints with pytest, async test clients, mocked database sessions, and JWT-protected route validation

Prerequisites

Complete Foundations, API Development, and Data Persistence first.

• What is JWT ?
• What is OAuth 2.0
• Google OAuth2 Authentication
• Authentication Implementation Overview
• Unit Testing FastAPI Applications
• Practice — Advanced
• Assessment