API Design Concepts to Master before Interviews

1. RESTful API Principles (Resources, Methods, Statelessness)

2. HTTP Methods & Status Codes (GET, POST, PUT, DELETE, 200, 404, 500)

3. API Naming Conventions & URI Design

4. Request & Response Structure (JSON, XML)

5. Versioning Strategies (URL, Header, Semantic Versioning)

6. Authentication Methods (API Keys, JWT, OAuth2)

7. Authorization & Access Control

8. Idempotency & Safe Operations

9. Pagination, Filtering & Sorting

10. Rate Limiting & Throttling

11. Caching Strategies (ETags, Cache-Control)

12. Error Handling & Standardized Responses

13. API Documentation (OpenAPI/Swagger)

14. API Testing (Postman, Insomnia)

15. GraphQL vs REST vs gRPC

16. Webhooks & Event-Driven APIs

17. API Gateway & Reverse Proxy

18. Security Best Practices (HTTPS, TLS, Encryption)

19. Input Validation & Data Sanitization

20. Logging & Monitoring APIs

21. API Performance Optimization

22. Contract-First vs Code-First Design

23. SDK Generation & Developer Experience (DX)

24. Backward Compatibility & Deprecation Strategy

25. Microservices API Communication

26. Service Discovery & Load Balancing

27. API Lifecycle Management

28. Multi-Tenancy in APIs

29. Observability (Tracing, Metrics, Logs)

30. Governance & API Standards

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