What is API Testing and Why API Testing is needed To fulfil the Requirements

What is API Testing,How does an API work,What are the types of API testing

What is API Testing and Why API Testing is needed To fulfil the Requirements

Testing is one of the most vital phase for development of any product or software and has been practiced in order to deliver better solutions. But every product might demand different type of testing, for example, though functionality testing does the job for website, security testing is still required to be done with. With major developments in Software Development Life Cycle approaches, we have various types of testing that assure best of quality products through all end points and API testing is one such type.

Multiple reasons like Security, Quality, cost effectiveness, fulfillment of customer’s requirement, understanding the performance, hitting a rock with unknown feature along with how testing helps in enhancing the while development process makes the testing key phase. 

What is API Testing?

A type of testing that involves point testing of Application Programming Interface and is responsible for regulating the requirements for multiple functions in a software. Here, we don’t provide any user input but rather a set of calls hit the API and receive the response. Now, to simply explain you what API is, it is a set of programming commands and tools that programmers can use to write code on multiple levels. Every time we do a simple product search on amazon, we use APIs written by the developers.

So, API testing is to examine these APIs and improve them. Functions like Performance, Security, Reliability, etc are properly tested. While most of the other testings consists of examining through User Interface, API testing is done on different level where design of the product is of no relevance and core business logic inspected and improved. 

What are the Advantages of API Testing?

Testing is one of the most crucial part of development and ensures that best quality is delivered to the end user. As per the analysis of Web API Testing Company, Here is the list of different advantages of API testing

  • Number of testings are planned and executed, but API testing could be a final step to test the main core of the software. 
  • API testing unlike other testings, does the job on code level and minor errors can be eliminated before they turn into major problems in future.
  • End to End testing of functions is carried out under API testing while Unit testing focuses on separate modules. API testing here has a wider scope.
  • Monitoring the application under various scenarios, which helps developer understand what could possibly go wrong and amend.
  • Browser Compatibility is achieved through working out multiple scenarios on multiple web browsers.    

How Does an API Testing Work?

Now that we’ve learned what API testing is and how important is it, let us look into how it is done. Basically, API testing is planned after builds are ready and it is crucial you understand the functions of API that you intend to test. A suitable test environment is established with accord to parameters, database and servers are made ready for proper tests.

Multiple questions are asked and answered as a process to have a strong argument through API testings, questions like: Target Consumer for API, how the API works normally, Problems that might appear, what will decide the outcome of the test, etc. 

There are number of tests that fall under API and testing these aspects assure the working of API. Tests like Functionality, Reliability, Load, Security, Proficiency, etc covers most parts of software on the ground of API testing. One of the most interesting test is the Negative Testing, which is to predict what possibly could go wrong, set up a test and make sure that even it goes wrong as predicted, it won’t impact the functionality of whole.  

Environment: Setting up environment for API testing can be complex as it does not involve any GUI, and all you do is play with parameters hitting the database and invoking APIs.

Test Cases: Multiple test cases are written like what would be return value, what if there is no response or a null one, what if another API is triggered – whether relevant or not, etc.

Output: With different test cases, different out will be expected and later it is important to compare the actual output with the expected output. 

Moving on, the errors that can be successfully detected in API testing are like security and performance issues, handling of unlike conditions, end to end working of a single functionality, structure of Response Data, ignored or absent functionalities, etc. There results assist in improving the API for further builds.

Learn Also: What are the Types of API Testing?

Why API Testing is Needed?

Basically, a simple reason for why API automation is required is to make sure the final product is of best version, ensuring the API implemented functions as intended in multiple factors like security, performance, etc. Every software has single core API, so it is essential to make sure it’s working. APIs now being one of the key part of an application, serving the business logic, makes API testing vital. On the other hand, most tests involve testing the GUI parts and does not bother the functioning logic of the software.

One of the major aspect of API Testing is to test the capability of the API to perform under pressure. Here, what we refer to Load Testing is to somewhat similar to performance testing, where you have a number of test scripts, test cases and multiple operations or functions are performed, hitting the APIs and receiving response. Every hit to API and it’s response is recorded, along with time consumed and performance is evaluated.

Furthermore, API testing can be done two ways like most other testings, which are Manual Testing and Automated Testing. Recent Developments in software enables you to set up a tool for automated testing, while on the contradict manual testing requires you to write test scripts and follow up on each step.


API automation testing is to make sure that the application functions the way it is made do, assurance of every function working properly. It certifies the product of it’s handling capabilities, security features and compatibility with cross platforms. 

Postman API testing, Rest API testing is the complement that makes sure business logic and user experience is written as required. 

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