Interview Questions on ASP.NET WEB API

In this article, I will share frequently asked ASP.Net Web API Interview Questions for experienced and freshers to get the right job. Find the list below:-

• Keep reading on Interview Questions on .NET Framework, Interview Questions on ASP.NET MVC

ASP.NET WEB API Interview Questions

Introducing ASP.NET Web API

• What is ASP.NET Web API?
• What is the difference between ASP.NET Web API and WCF?
• When to prefer ASP.NET Web API over WCF?
• Which .NET Framework supports ASP.NET Web API?
• Can we consume ASP.NET Web API in applications created using other than .NET?
• What is the difference between ASP.NET MVC application and ASP.NET Web API application?
• What are the RESTful Services?
• What are the new features introduced in ASP.NET Web API 2.0?
• Can we return View from Web API?
• Does ASP.NET Web API replace the WCF?
• What is the difference between Under-Posting and Over-Posting in ASP.NET Web API?

ASP.NET Web API Fundamentals

• What is Request Verbs or HTTP Verbs?
• What is the Request Header?
• What is the Request Body?
• What is the Response Body?
• What are HTTP Status Codes?
• How to provide an alias name for Web API Action?
• What is Parameter Binding in ASP.NET Web API?
• What is FromUri Attribute and How to use FromUri Attribute in ASP.NET Web API?
• What is FromBody Attribute and How to use this Attribute in ASP.NET Web API?
• Can we declare the FromBody attribute on multiple parameters?
• How to get Data from the SQL Server Database using ASP.NET Web API?
• How to Post Data in ASP.NET Web API?
• How to Put or Update Data in ASP.NET Web API?
• How to Delete Data in ASP.NET Web API?

Content Negotiation

• What is Content Negotiation in Web API?
• What is the role of the Quality Factor in Web API request?
• If no Accept header will be specified, then the response will be in which format?
• What is Media-Type Formatter in ASP.NET Web API?
• How can we return data only in JSON or XML formatted data in Web API?
• How can we format or Indent the raw data in Web API?

Web API Security

• What is Authentication?
• What is Authorization?
• What is the use of Authorize Attribute?
• What is Basic HTTP Authentication?
• How to create a custom Basic Authentication Web API filter?
• How to consume or call Web API with Basic HTTP Authentication using jQuery & Ajax if need to consume in the same Domain?
• What are the Advantages and Disadvantages of Basic Authentication?
• What is the Same-Origin Policy?
• How to enable CORS in the Web API project?
• How can we Disable CORS for an Action only in the Web API project?
• How to implement Token-based Authentication in Web API project?

Routing

• How Web API Routes HTTP request to the Controller ASP.NET MVC?
• How to define a route in ASP.NET MVC?
• How to include Action Name in the routing template?
• How to prevent an Action Method to be invoked in Web API?
• What is Attribute-based routing and How can we enable it in a Web API project?
• What is the use of the RoutePrefix attribute?
• What are the Route Constraints?
• Can we use both Convention based routing and attribute routing in the same Web API application?

Web API Versioning

• Why we need Web API Versioning?
• In How many ways we can do Web API Versioning?
• How to achieve Web API Versioning with the URI?
• How to achieve Web API Versioning with the Query string parameter?
• How to achieve Web API Versioning with the Custom Header Parameter?
• How to achieve Web API Versioning with the Accept Header?

Exception Handling and Dependency Injection

• What is Exception handling?
• How to handle the exception with the help of HttpResponseException Class?
• How can we create custom Exception Filter in ASP.NET Web API?
• How can we register custom Exception Filter in ASP.NET Web API?
• How to register an Exception Filter globally?
• What is Dependency Injection?
• What are the different types of techniques to implement Dependency Injection in Web API?
• What are Dependency Injection Containers or DI Containers?
• How to implement Dependency Injection using Ninject DI Container?

Deployment

• How we can Deploy the ASP.NET Web API?
• What are the steps required in order to Deploy the ASP.NET Web API on the IIS Server?
• What are the steps required to Self-Host an ASP.NET Web API?

References: Microsoft Docs – ASP.NET Web API,  Stack Overflow – ASP.NET Web API

Conclusion

I hope you liked this article on the asp.net mvc web api interview questions. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.