API Authentication Implement secure authentication mechanisms for APIs using modern standards and best practices. Authentication Methods | Method | Use Case | Security Level | |--------|----------|----------------| | JWT | Stateless auth, SPAs | High | | OAuth 2.0 | Third-party integration | High | | API Keys | Service-to-service | Medium | | Session | Traditional web apps | High | JWT Implementation (Node.js) Security Requirements - Always use HTTPS - Store tokens in HttpOnly cookies (not localStorage) - Hash passwords with bcrypt (cost factor 12+) - Implement rate limiting on auth endpoints…