ASP.NET Web API Interview Cheat Sheet

1. What is ASP.NET Core Web API and how does it differ from MVC?

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2. Explain the request pipeline in ASP.NET Core Web API.

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3. What are Controllers and how are they structured?

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4. How does Attribute Routing work in Web API?

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5. Explain model binding and validation.

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6. What are Action Results and why are they important?

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7. What is Content Negotiation in Web API?

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8. How are dependency injection and services handled in Web API?

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9. Explain the difference between Scoped, Singleton, and Transient lifetimes.

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10. How do you handle exceptions in Web API?

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11. How does ASP.NET Core handle JSON serialization?

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12. What are Action Filters and when do you use them?

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13. Explain the purpose of FromBody, FromQuery, and FromRoute.

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14. How do you implement versioning in Web API?

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15. What is CORS and why is it important in Web API?

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16. How do you secure a Web API?

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17. Explain the difference between synchronous and asynchronous controllers.

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18. What is Response Caching in Web API?

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19. How do you test a Web API effectively?

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20. Why is Swagger/OpenAPI important in Web API?

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21. What is Middleware in ASP.NET Core Web API?

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22. How does the UseRouting and UseEndpoints middleware work?

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23. How do you create custom middleware?

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24. Explain Filters in ASP.NET Core Web API.

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25. How is model validation applied automatically?

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26. How do you implement global exception handling using middleware?

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27. Explain the difference between synchronous and asynchronous middleware.

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28. How can you implement logging in Web API?

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29. What is diagnostic middleware and why is it important?

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30. How do you handle CORS in a Web API?

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31. How do you restrict content types in requests?

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32. How do you inspect and log request/response bodies safely?

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33. What is the difference between endpoint routing and legacy MVC routing?

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34. How do you implement API versioning?

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35. How do you configure JSON serialization globally?

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36. How do you handle API response formatting?

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37. How do you throttle requests in ASP.NET Core Web API?

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38. What are dependency injection best practices in Web API?

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39. How do you monitor Web API performance in production?

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40. How do you implement authentication in Web API?

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41. How does JWT authentication work?

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42. How do you implement role-based authorization?

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43. What is claims-based authorization?

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44. How do you create custom authorization policies?

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45. What is the difference between authentication and authorization?

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46. How do you secure sensitive API endpoints?

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47. How do you handle token expiration in JWT?

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48. How do you protect against CSRF attacks in APIs?

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49. How do you secure API keys in Web API?

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50. What is OAuth2 and how is it used with Web API?

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