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ASP.NET Web API

100 ASP.NET Web API interview questions

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ASP.NET Web API Fundamentals


  • 1.

    What is ASP.NET Web API and what is it used for?

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  • 2.

    How does ASP.NET Web API differ from WCF and ASP.NET MVC?

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  • 3.

    Explain RESTful services and how they relate to ASP.NET Web API.

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  • 4.

    What are HTTP verbs and how are they used in Web API?

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  • 5.

    How do you create a basic Web API controller?

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  • 6.

    Describe routing in ASP.NET Web API.

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  • 7.

    How are requests mapped to actions in Web API?

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  • 8.

    What is content negotiation in the context of Web API?

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  • 9.

    What data formats does Web API support by default for response data?

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  • 10.

    How do you secure a Web API?

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ASP.NET Web API Configuration and Hosting


  • 11.

    How can you host an ASP.NET Web API application?

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  • 12.

    What is OWIN and how does it relate to Web API?

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  • 13.

    Explain the difference between self-hosting and IIS hosting in Web API.

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  • 14.

    How do you configure CORS in Web API?

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  • 15.

    What is attribute routing and how does it improve the Web API?

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  • 16.

    How do you handle versioning in Web API?

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ASP.NET Web API Request and Response


  • 17.

    How do you handle different response status codes in Web API?

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  • 18.

    What is IHttpActionResult, and how does it work in action results?

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  • 19.

    How do you read data from the query string in Web API?

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  • 20.

    Explain the use of Request and Response message classes.

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  • 21.

    How can you enforce SSL in a Web API action?

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  • 22.

    What is Model Binding in Web API and how is it different from MVC?

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  • 23.

    How do you bind complex types in Web API?

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ASP.NET Web API Serialization and Media Formats


  • 24.

    How do you customize serialization in Web API?

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  • 25.

    What are media type formatters in Web API?

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  • 26.

    How do you support XML or JSON, or other formats as a response in Web API?

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  • 27.

    What is BSON and how can it be used with Web API?

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  • 28.

    How do you return a custom response format from an action?

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ASP.NET Web API Action Filters and Handlers


  • 29.

    What are DelegatingHandlers in Web API?

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  • 30.

    How do you implement Action Filters in Web API?

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  • 31.

    Explain the difference between action filters and authorization filters.

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  • 32.

    How can you implement custom authentication in Web API?

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  • 33.

    What is message lifecycle in ASP.NET Web API?

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ASP.NET Web API Dependency Injection and Testing


  • 34.

    How do you implement Dependency Injection in ASP.NET Web API?

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  • 35.

    What frameworks are useful for testing Web API applications?

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  • 36.

    Explain the process of unit testing in ASP.NET Web API.

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ASP.NET Web API and Entity Framework


  • 37.

    How can you integrate Entity Framework with Web API?

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  • 38.

    Describe the best practices for using Entity Framework with Web API.

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Advanced ASP.NET Web API Topics


  • 39.

    How does Web API implement OData?

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  • 40.

    What are action selectors?

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  • 41.

    Explain the use of Exception Filters in your API.

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  • 42.

    What are the benefits of using async and await in Web API?

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  • 43.

    How can you handle file uploads in Web API?

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  • 44.

    Discuss SignalR and its integration with ASP.NET Web API.

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ASP.NET Web API performance


  • 45.

    What are some performance optimization strategies for Web API?

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  • 46.

    How do you implement caching in Web API?

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  • 47.

    What role does HttpResponseMessage play in Web API performance?

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ASP.NET Web API Security


  • 48.

    What are the different ways to authenticate users in Web API?

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  • 49.

    How do you implement OAuth2 authorization in Web API?

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  • 50.

    Explain token-based authentication in Web API.

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ASP.NET Web API Client-Side


  • 51.

    How can a client consume a Web API?

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  • 52.

    Discuss different client libraries available for accessing ASP.NET Web API.

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  • 53.

    What is Swagger, and how does it integrate with Web API?

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ASP.NET Web API Troubleshooting


  • 54.

    How do you handle errors globally in ASP.NET Web API?

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  • 55.

    What is a common cause for a 404 not found error in Web API and how can it be resolved?

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ASP.NET Web API Best Practices


  • 56.

    Discuss some best practices for API versioning.

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  • 57.

    How can you make your Web API more RESTful?

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  • 58.

    What are some common security issues to be aware of when developing a Web API?

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  • 97.

    What are some common patterns used in API development?

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  • 98.

    How do you manage large-scale API development and multiple teams?

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  • 99.

    Describe some anti-patterns to avoid in Web API development.

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ASP.NET Web API Design and Architecture


  • 59.

    When should you use ASP.NET Web API over other technologies?

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  • 60.

    How can you design a scalable API using ASP.NET Web API?

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  • 61.

    Describe a microservices architecture with reference to ASP.NET Web API.

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  • 62.

    What is the Repository pattern and how does it apply to Web API?

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Miscellaneous Topics on ASP.NET Web API


  • 63.

    What is Web API OWIN middleware?

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  • 64.

    How can you document your Web API?

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  • 65.

    Describe how you would implement rate limiting in ASP.NET Web API.

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ASP.NET Web API and Globalization


  • 66.

    How do you support multiple languages in Web API?

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  • 67.

    What is localization and how can it be applied in Web API?

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ASP.NET Web API Routing


  • 68.

    Explain convention-based routing in Web API.

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  • 69.

    What are the limitations of convention-based routing and how can they be overcome?

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  • 70.

    How can you define optional parameters in the route?

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  • 71.

    What is route constraint in Web API and how do you use it?

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ASP.NET Web API and Data Transfer Objects (DTOs)


  • 72.

    What are DTOs and why are they important in Web API?

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  • 73.

    Explain how to use AutoMapper in ASP.NET Web API.

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ASP.NET Web API Action Results


  • 74.

    What are the advantages of using IHttpActionResult?

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  • 75.

    Differentiate between Ok, BadRequest, NotFound, and other action results in Web API.

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ASP.NET Web API and Asynchronous Programming


  • 76.

    Discuss the benefits and risks of using asynchronous controllers in Web API.

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  • 77.

    Give an example of how to implement an asynchronous action in Web API.

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ASP.NET Web API and Content Negotiation


  • 78.

    Define content negotiation and its role in a Web API application.

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  • 79.

    How do you force Web API to return a specific content type?

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ASP.NET Web API and Security Features


  • 80.

    How do you implement claims-based authentication in Web API?

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  • 81.

    Explain Cross-Site Request Forgery (CSRF) protection in Web API.

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  • 82.

    How does anti-forgery token work in Web API and when should you use it?

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ASP.NET Web API Caching


  • 83.

    What are the different caching mechanisms available to a Web API?

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  • 84.

    How does server-side caching work in Web API?

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ASP.NET Web API and Middleware


  • 85.

    Explain the role of middleware in the ASP.NET Web API pipeline.

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  • 86.

    How can middleware be used to implement cross-cutting concerns?

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ASP.NET Web API and Deployment


  • 87.

    What are some considerations when deploying a Web API to Azure?

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  • 88.

    How do you enable HTTPS for a Web API on Azure?

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ASP.NET Web API Advanced Topics


  • 89.

    What are HATEOAS and its importance in RESTful APIs?

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  • 90.

    Explain how to implement HATEOAS in an ASP.NET Web API.

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ASP.NET Web API and Monitoring


  • 91.

    What tools can you use to monitor the health and performance of your Web API?

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  • 92.

    How can you log API requests and responses?

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ASP.NET Web API Testing and Troubleshooting


  • 93.

    What approaches can you take to troubleshoot a failing Web API?

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  • 94.

    How can integration testing be implemented for a Web API?

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ASP.NET Web API and Interoperability


  • 95.

    How can you ensure your Web API is consumable by a wide range of clients?

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  • 96.

    What is JSONP, and how can it be used with Web API?

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ASP.NET Web API Emerging Technologies and Trends


  • 100.

    How can ASP.NET Web API leverage new technologies like Docker and Kubernetes?

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