API Testing Interview Questions with Answers

Now a days, API Testing is the most popular topic in the software testing industry. In almost every testing interview, you will be asked questions related to API Testing. In this series, we will cover the most frequently asked API Testing Interview Questions with Answers. These questions are suitable for both freshers and experienced professionals.

What is an API?

API is a layer that allows two software applications to communicate with each other. When two or more software applications want to exchange the data with each other, they use a common set of rules and instructions to communicate with each other. This set of rules and instructions is called API.

What is API Testing?

API Testing is a type of software testing that involves testing APIs to check if an api meets expectations in terms of functionality, reliability, performance, and security. In API testing, We send a request to the API with the known data and check if the response is as expected or not.

What are the types of API Testing?

There are mainly four types of API Testing:

Functionality Testing
Reliability Testing
Performance Testing
Security Testing

What are the tools used for API Testing?

There are many tools available in the market for API Testing. Some of the popular tools are:

Postman
SoapUI
Rest Assured
Swagger
Apigee

Like above questions, there are many more questions that are frequently asked in the API Testing. We have divided these questions into two categories:

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