star iconstar iconstar iconstar iconstar icon

"Huge timesaver. Worth the money"

star iconstar iconstar iconstar iconstar icon

"It's an excellent tool"

star iconstar iconstar iconstar iconstar icon

"Fantastic catalogue of questions"

Ace your next tech interview with confidence

Explore our carefully curated catalog of interview essentials covering full-stack, data structures and alogithms, system design, data science, and machine learning interview questions

ASP.NET Web API

100 ASP.NET Web API interview questions

Only coding challenges
Topic progress: 0%

ASP.NET Web API Fundamentals


  • 1.

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

    Answer:
  • 2.

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

    Answer:
  • 3.

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

    Answer:
  • 4.

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

    Answer:
  • 5.

    How do you create a basic Web API controller?

    Answer:
  • 6.

    Describe routing in ASP.NET Web API.

    Answer:
  • 7.

    How are requests mapped to actions in Web API?

    Answer:
  • 8.

    What is content negotiation in the context of Web API?

    Answer:
  • 9.

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

    Answer:
  • 10.

    How do you secure a Web API?

    Answer:

ASP.NET Web API Configuration and Hosting


  • 11.

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

    Answer:
  • 12.

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

    Answer:
  • 13.

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

    Answer:
  • 14.

    How do you configure CORS in Web API?

    Answer:
  • 15.

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

    Answer:
  • 16.

    How do you handle versioning in Web API?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Request and Response


  • 17.

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

    Lock icon indicating premium question
    Answer:
  • 18.

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

    Lock icon indicating premium question
    Answer:
  • 19.

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

    Lock icon indicating premium question
    Answer:
  • 20.

    Explain the use of Request and Response message classes.

    Lock icon indicating premium question
    Answer:
  • 21.

    How can you enforce SSL in a Web API action?

    Lock icon indicating premium question
    Answer:
  • 22.

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

    Lock icon indicating premium question
    Answer:
  • 23.

    How do you bind complex types in Web API?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Serialization and Media Formats


  • 24.

    How do you customize serialization in Web API?

    Lock icon indicating premium question
    Answer:
  • 25.

    What are media type formatters in Web API?

    Lock icon indicating premium question
    Answer:
  • 26.

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

    Lock icon indicating premium question
    Answer:
  • 27.

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

    Lock icon indicating premium question
    Answer:
  • 28.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Action Filters and Handlers


  • 29.

    What are DelegatingHandlers in Web API?

    Lock icon indicating premium question
    Answer:
  • 30.

    How do you implement Action Filters in Web API?

    Lock icon indicating premium question
    Answer:
  • 31.

    Explain the difference between action filters and authorization filters.

    Lock icon indicating premium question
    Answer:
  • 32.

    How can you implement custom authentication in Web API?

    Lock icon indicating premium question
    Answer:
  • 33.

    What is message lifecycle in ASP.NET Web API?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Dependency Injection and Testing


  • 34.

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

    Lock icon indicating premium question
    Answer:
  • 35.

    What frameworks are useful for testing Web API applications?

    Lock icon indicating premium question
    Answer:
  • 36.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Entity Framework


  • 37.

    How can you integrate Entity Framework with Web API?

    Lock icon indicating premium question
    Answer:
  • 38.

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

    Lock icon indicating premium question
    Answer:

Advanced ASP.NET Web API Topics


  • 39.

    How does Web API implement OData?

    Lock icon indicating premium question
    Answer:
  • 40.

    What are action selectors?

    Lock icon indicating premium question
    Answer:
  • 41.

    Explain the use of Exception Filters in your API.

    Lock icon indicating premium question
    Answer:
  • 42.

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

    Lock icon indicating premium question
    Answer:
  • 43.

    How can you handle file uploads in Web API?

    Lock icon indicating premium question
    Answer:
  • 44.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API performance


  • 45.

    What are some performance optimization strategies for Web API?

    Lock icon indicating premium question
    Answer:
  • 46.

    How do you implement caching in Web API?

    Lock icon indicating premium question
    Answer:
  • 47.

    What role does HttpResponseMessage play in Web API performance?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Security


  • 48.

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

    Lock icon indicating premium question
    Answer:
  • 49.

    How do you implement OAuth2 authorization in Web API?

    Lock icon indicating premium question
    Answer:
  • 50.

    Explain token-based authentication in Web API.

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Client-Side


  • 51.

    How can a client consume a Web API?

    Lock icon indicating premium question
    Answer:
  • 52.

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

    Lock icon indicating premium question
    Answer:
  • 53.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Troubleshooting


  • 54.

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

    Lock icon indicating premium question
    Answer:
  • 55.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Best Practices


  • 56.

    Discuss some best practices for API versioning.

    Lock icon indicating premium question
    Answer:
  • 57.

    How can you make your Web API more RESTful?

    Lock icon indicating premium question
    Answer:
  • 58.

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

    Lock icon indicating premium question
    Answer:
  • 97.

    What are some common patterns used in API development?

    Lock icon indicating premium question
    Answer:
  • 98.

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

    Lock icon indicating premium question
    Answer:
  • 99.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Design and Architecture


  • 59.

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

    Lock icon indicating premium question
    Answer:
  • 60.

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

    Lock icon indicating premium question
    Answer:
  • 61.

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

    Lock icon indicating premium question
    Answer:
  • 62.

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

    Lock icon indicating premium question
    Answer:

Miscellaneous Topics on ASP.NET Web API


  • 63.

    What is Web API OWIN middleware?

    Lock icon indicating premium question
    Answer:
  • 64.

    How can you document your Web API?

    Lock icon indicating premium question
    Answer:
  • 65.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Globalization


  • 66.

    How do you support multiple languages in Web API?

    Lock icon indicating premium question
    Answer:
  • 67.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Routing


  • 68.

    Explain convention-based routing in Web API.

    Lock icon indicating premium question
    Answer:
  • 69.

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

    Lock icon indicating premium question
    Answer:
  • 70.

    How can you define optional parameters in the route?

    Lock icon indicating premium question
    Answer:
  • 71.

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

    Lock icon indicating premium question
    Answer:

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


  • 72.

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

    Lock icon indicating premium question
    Answer:
  • 73.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Action Results


  • 74.

    What are the advantages of using IHttpActionResult?

    Lock icon indicating premium question
    Answer:
  • 75.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Asynchronous Programming


  • 76.

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

    Lock icon indicating premium question
    Answer:
  • 77.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Content Negotiation


  • 78.

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

    Lock icon indicating premium question
    Answer:
  • 79.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Security Features


  • 80.

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

    Lock icon indicating premium question
    Answer:
  • 81.

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

    Lock icon indicating premium question
    Answer:
  • 82.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Caching


  • 83.

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

    Lock icon indicating premium question
    Answer:
  • 84.

    How does server-side caching work in Web API?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Middleware


  • 85.

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

    Lock icon indicating premium question
    Answer:
  • 86.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Deployment


  • 87.

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

    Lock icon indicating premium question
    Answer:
  • 88.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Advanced Topics


  • 89.

    What are HATEOAS and its importance in RESTful APIs?

    Lock icon indicating premium question
    Answer:
  • 90.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Monitoring


  • 91.

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

    Lock icon indicating premium question
    Answer:
  • 92.

    How can you log API requests and responses?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Testing and Troubleshooting


  • 93.

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

    Lock icon indicating premium question
    Answer:
  • 94.

    How can integration testing be implemented for a Web API?

    Lock icon indicating premium question
    Answer:

ASP.NET Web API and Interoperability


  • 95.

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

    Lock icon indicating premium question
    Answer:
  • 96.

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

    Lock icon indicating premium question
    Answer:

ASP.NET Web API Emerging Technologies and Trends


  • 100.

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

    Lock icon indicating premium question
    Answer:
folder icon

Unlock interview insights

Get the inside track on what to expect in your next interview. Access a collection of high quality technical interview questions with detailed answers to help you prepare for your next coding interview.

graph icon

Track progress

Simple interface helps to track your learning progress. Easily navigate through the wide range of questions and focus on key topics you need for your interview success.

clock icon

Save time

Save countless hours searching for information on hundreds of low-quality sites designed to drive traffic and make money from advertising.

Land a six-figure job at one of the top tech companies

amazon logometa logogoogle logomicrosoft logoopenai logo
Ready to nail your next interview?

Stand out and get your dream job

scroll up button

Go up