Skip to main content

API Authentication and Authorization

Securing APIs is non-negotiable in production. This series takes you from password hashing fundamentals through JWT and OAuth2 flows to role-based access control and service-to-service authentication. By the end, you'll know how to protect routes, validate tokens, refresh credentials, and integrate social login—the same patterns used by companies like Stripe, GitHub, and Google to safeguard millions of API requests daily.

Each article is self-contained but builds on previous concepts. Start with JWT basics if you're new to authentication; skip ahead to microservice patterns if you're already familiar with API keys and tokens. Every example runs in FastAPI and follows Python best practices for 2026.

Articles in this series​