API Design Interview Questions and Answers for 2025
Are you preparing for an API design interview? In this video, we cover the most common API design interview questions along with expert answers to help you ace your next tech interview!
📌 Topics Covered:
✅ REST vs. GraphQL – Which one to choose?
✅ How to design a scalable and secure API
✅ Versioning strategies for APIs
✅ Authentication & authorization best practices (OAuth, JWT, etc.)
✅ Handling rate limiting, caching, and performance optimization
✅ Common pitfalls in API design & how to avoid them
🔥 Perfect for: Software engineers, backend developers, and anyone preparing for system design interviews.
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1. What is an API and what are its main purposes?
2. How do you approach designing an API from scratch?
3. What are some best practices for RESTful API design?
4. How would you handle versioning in an API?
5. Explain the concept of idempotency in REST APIs and how it's implemented.
6. What are the main differences between PUT and PATCH requests in REST APIs?
7. How do you handle authentication and authorization in API design?
8. What strategies would you use to design a scalable API that can handle increased traffic?
9. Can you explain the concept of rate limiting in API development and its importance?
10. How do you design APIs to be easily consumable by clients?
11. What are some common HTTP status codes, and when should they be used?
12. How would you handle long-running operations with a REST API?
13. Explain the Richardson Maturity Model and its levels.
14. What are the key components of well-designed API documentation?
15. How do you approach error handling and communicate errors to API consumers?
16. What is HATEOAS and how does it relate to REST API design?
17. How would you design an API to support both JSON and XML formats?
18. What are microservices, and how do they relate to API design?
19. How do you ensure backward compatibility when updating an API?
20. What is the role of caching in API design, and how would you implement it?
21. How do you handle pagination in API responses?
22. What are the pros and cons of using GraphQL vs REST for API design?
23. How would you design an API to support real-time updates or streaming data?
24. What security considerations should be taken into account when designing an API?
25. How do you test and validate API designs before implementation?
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