Web Api Interview Questions & answers

Web Api Interview Questions: Web Api Interview Questions are very important in the IT industry. In this blog post, we discuss some of the most common Web Api Interview Questions. The interview outcome depends on how well you answer these questions in the interviews.

An API (Application Programming Interface) is a software interface that provides access to data or services over a network. A web API, which we will focus on in this article, allows developers to easily build their own applications using the services and tools provided by a company.

Post On:	Web Api Interview Questions
Post Type:	Interview Questions
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Web Api Interview Questions can be a tricky part of your job search process. To make it easier for you, we have created this blog post to help you prepare and think about how you will answer these questions. The answers are not an exact science but they should give you some idea of what the interviewer is looking for when asking these questions.

There are some questions that can be asked in an interview and some that you need to memorize. Read the following Web Api Interview Questions blog post and see if you get an idea of how to tackle these questions. Also, this blog post has mentioned some common mistakes which are being made by candidates during the interviews. It will help you become a better candidate with increased confidence when interviewed by the recruiters or companies.

Interview Questions On Web API

What is an API?

The full form for API is Application Programming Interface. We are using APIs as an interface that can help in communicating and data exchange between two systems. The APIs are nothing but a collection of functions that are executable by other functions of the software application. And it also takes the request from a user and processes that request and send back the response without exposing the internal application details.

What is API testing?

During the API testing, we validate the API meets its expectations in terms of functionality, reliability, performance, and security of the application. We can perform the API testing in any software system where we have used multiple APIs and in those APIs we should put more focus on the Business logic layer of the software architecture.

What are the various API Testing Types?

This is a combination of various testing types like:

• Unit testing
• Functional testing
• Load testing
• Runtime/ Error Detection
• Security testing
• UI testing
• Interoperability and WS Compliance testing
• Penetration testing
• Fuzz testing

What are the common tests performed on API?

You can do the following tests on API’s

• Check is the API is return the expected data or not return anything.
• Check you are getting the expected data based on your inputted condition data
• Check is the API is updating any data structure.
• Check is the API triggers any events or calls of another API.

What are the common Protocols are used in API testing?

There are different protocols are available but in API testing we are mainly used the below protocols:

• HTTP
• REST
• SOAP
• JMS
• UDDI

What tools are used for API testing?

Currently, in the market there are somany different API testing tools are available on the internet. Out of all those API testing tools, there are a few which are mostly used and those are Katalon studio, Postman, SoapUi, Parasoft SOAtest, Apigee, JMeter, Apigee, API fortress, JUnit, etc.

What is an API environment?

The API environment is an application programming interface that allows developers to connect the application with the server and database as per the requirement of the software application.

In API testing there is no involvement of the GUI. For this reason, once the installation process is completed we are triggering so many API calls to the original environment and checking the results.

What is an API framework?

The APIs are allowing you to interact with another operating system or application. Based on your request the APIs are tries to pull some of the source code from the framework, which will work with other sources of code or applications of the code. In this manner, the completed information pulled communicated through the API.

Why do we need web APIs?

Web APIs can be used to create RESTful web services using the .NET Framework. They help developers create HTTP services that can be accessed by browsers, devices, or tablets. ASP.NET Web API can be used with MVC to develop any type of application.

What are the advantages of using web APIs?

If you’re looking for a simple, lightweight solution, WEB API is the way to go. It’s fast and can use any text format, including XML. Plus, you can use WEB API to create full-blown REST Services. There’s no need for data contracts or complex configurations like there is with WCF.

What are the different return types in Web API?

The Web API action method can have the following return types.

• Void – This will return you empty content.
• Primitive Type/Complex Type – You can write the serialized return value into the response body
• HttpResponseMessage – This will convert the response to an HttpResponseMessage.
• IHttpActionResult – this will call internally ExecuteAsync for creating HttpResponseMessage.

Which protocols are supported in Web API?

Web APIs are a way to access different services and data using the HTTP protocol. This makes them easy to use for applications and websites.

Web Api Interview Questions

This blog post covers a lot of different types of questions that you might be asked in an interview. It is always good to know how to prepare for interviews so that you are ready for the questions that are thrown at you. We hope this blog helps!