API Testing Definition – Benefits, Types, and Tools

Learn what API testing is, benefits, types of API testing, and important tools for this.

What is API Testing?

API (Application Programming Interface) testing is a process that tests the functionality, performance, reliability, and security of APIs directly.

API testing is usually done after the functional testing has been completed. It is mainly about finding the defects or errors in the working of API. There are two major types of API testing: functional API testing and security API testing. Both types of API testing are equally important since both serve different purposes.

Benefits of API testing 

Language-Independent:  Data is exchanged through XML and JSON formats so that any language can be used for test automation. XML and JSON are generally structured data, making validation fast and stable. There 

are also built-in libraries to help compare data using these data formats. 

GUI-Independent: API testing can be done in the app before GUI testing. Timely testing means earlier response and satisfactory squad productivity. The app’s core functionality can be tested to uncover minor errors and evaluate the strength of the build.

Improved Test Coverage: Most APIs/web services have specifications, allowing you to create automated tests with high coverage – including functional tests and non-functional tests.

 What are the types of API Testing? 

  • Procedural: Procedural APIs go to the server to perform the major assignments of the application. After finalizing the task,give an interface to the user through which the user can complete his assignments. 
  • Object-Oriented: The Object-Oriented API performs the detailed assignments of objects and then shifts them to the server. Object-Oriented API is extra productive and quicker than other APIs. 
  • Service-Oriented: Service-Oriented API is used for e-commerce websites; the user performs the tasks through the application and transmits  them to the server in the form of Service-Oriented API. 
  • Resource-Oriented: Resource Oriented API stores or collects our data and then takes it to the server; big companies use it to secure their company data.

applications of API

1. Time-saving 

With the help of this way, we can automate the task so that by using it, the time of the users is also saved.

2. Efficiency

With its help, it furnishes an easy interface while protecting the complexity. Therefore, using it improves the efficiency of the output.

3. Reach 

API has different identities, not only that but there is a difference in their work. Therefore the reach of API is very high. Their use is easier than the available technology.

4. Automation

There is an interaction between machine and machine here, so people do not need to do it themselves. They make the task easy and automated, which does not require interaction. 

API Testing Tools 

Next, we are advising you on the best API Testing Tools. You can use them according to your wants. 

1. Katalon Studio

Katalon Studio is a detailed and extensive toolset for web and mobile app mechanization testing. It arrives with a range of important aspects, involving pop-up, iFrame, wait-time, and more, to survive common Web UI test automation challenges.

 2. Postman tool

Postman tool is an interesting and voluntary tool for analyzing the API. Postman can create a suggestion and gives the reaction to make clear that it includes the component that we want in the API. 

3. API Fortress

API Fortress is a rapid software that enables two applications to communicate with each other.

4. Ping API

The Ping tool tests whether a particular host is reachable across an IP network. A Ping measures the time it takes for packets sent from the local host to a destination computer and back.

 5. Jmeter

Jmeter is a testing device from Apache used to evaluate and calculate the performance of applications, various software assistance, and commodities.

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