API Testing Interview Questions and Answers

API Testing Interview Questions and Answers

API testing involves testing application programming interfaces (APIs) directly, and as part of integration testing, in order to determine if they meet expectations for functionality, reliability, performance, and security. The purpose of API testing is to enable an organization to monitor the lifecycle of the interface, and ensure that the requirements of the applications and developers are satisfied beforehand. API testing tools control and automate connections between an application and the API, while ensuring consistency between different API versions and implementations. Such tools employ security procedures and policies to authorize, authenticate, and manage access to API data. API testing is critical for any organization’s API approach as they have strategic importance. API testing software can be developed in-house by organizations or can be purchased through third-party providers.

What is an API?

What is API Testing?

Can you explain API documentation?

What are the important principles of an API test design?

What are the different types of API Testing?

Why is API Testing Important Now?

What is REST API?

What is Age Testing?

What are the common protocols used in API Testing?

What are the differences between API and Web services?

What approach should be followed for the API testing?

What are the tools used for API Testing?

What are the some API errors?

What are the different application integration styles?

What are some key characteristics of REST?

What is API framework?

Can you explain API Builder?

What is messaging in RESTful Web services?

What are the differences between API testing and Unit Testing?

What are most commonly used HTTP methods?

Can you explain caching mechanism?

What is the upper limit for a payload to pass in the POST method?

Can you explain the difference between PUT and POST methods?

What are the differences between API testing and UI level testing?

What are the most used templates for API documentation?

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