API Testing

application programming interface API

What is API?


API is an acronym for Application Programming Interface. API acts as a communication protocol between the client and the server. In other words, it is an intermediate software component that delivers the request from one software to another and sends the response back.

What is API Testing? Where is it performed?

API testing focuses on testing the business logic, data responses, security, and performance bottlenecks of Application Programming Interfaces. In any application, the business logic processing occurs between the User Interface and the Database. So, API testing is performed at this business layer where the business processing occurs.

Application Program interface

Why is API Testing important?

API importance

API testing is necessary to check the connection between two platforms. It is considered an essential test in software engineering as it can find those crucial defects which would otherwise be missed out in UI testing.


  • Focus on core functionality
  • Cost-Effective
  • Language/Technology Independent
  • Easy Integration
  • Effective Time Saving
QAonCloud API services

API Testing Types

  • Functional Testing
  • Security Testing
  • Load Testing
  • Fuzz Testing
  • Penetration Testing
  • Web UI Testing etc.,

API Testing Tools

  • JMeter
  • Airborne
  • vREST
  • SOAtest
  • Airborne
  • HttpMaster
  • PingAPI
  • Postman
  • API Fortress


At QAonCloud , we provide fully managed testing for your RESTful and other APIs directly as well as part of integration testing based on your project timelines and needs.

Our QA architect and the delivery manager will provide you with a feasible solution of API Testing.