Quick Guide to Understand API Testing in Product Development

March 18, 2021

API testing, popularly known as ‘Application Programming Interface’ in the world of web application development, is a process that checks the quality of a software product. Depending on the product type, there is a variation in the testing procedure.

API testing efficiency is considered to be vital when the practice of API heads to the production stage. If the API monitoring is perfect, it can be reflected in the production process as you will obtain accurate data on-time. At times, there might be an instance reported – breaking of an API endpoint. When such a break occurs, everything gets repeated in the loop and you will face the challenge of detecting the issue. The issue should be identified and resolved before it gets noticed by the end-users.

The concept of API testing in product development includes:
  • Quality assurance actions
  • API calls, outputs
  • Validating the responses
  • Varied parameters

In recent times, a majority of the organizations and corporate have been practicing testing to mitigate these glitches during the software development services. It is all about identifying and coming up with a solution before the customer spots the error. The endpoints of API undergo the test finally before the deployment and it ensures the competence of the software product.

Note – API testing is vital even if you have notable web services such as OS, DB, API to access the various resources remotely.

Depending on the significance of testing during the product/software development service, we have prepared a precise and easy-to-understand guide.

Read on to know more!

Possible Concerns Regarding the API Testing

  • Figuring out the return value of API (based on the input)
  • Cross-checking if the API is giving a wrong answer
  • Probing if the API is making a call to another API
  • Connection of API to data structures

Different Types of API Testing

Proficiency Testing

The technique of proficiency testing is centered around the potential of the API. This type of testing ensures the capability that is rendered to the developers. Also, it measures the level of feasibility that covers the implementation of the API actions.

Creativity Testing

The creativity of the API can be used in various extraordinary ways and this is one of its best abilities. Creativity testing includes the checking of various ways on how an API can be used. It makes sure to check and analyze whether an API can be used in multiple ways. If it cannot evaluate the concept, the testing procedure reveals that the API is written with imperfections.

Load Testing

The concept of load testing checks whether an API has the potential to control and manage a bulk of the load. The testing examines how an API manages the higher load (when received beyond expectations). Such testing measures the response time, examining the number of materials passed via the process, and checking up on other relevant factors. The complete testing focuses on acquiring an understanding of the high-load situation.

Functionality Testing

This kind of testing ensures to authenticate the various operational needs of product development. The functionality testing utilizes various situations to ensure that the API is working effectively (according to the envisaged parameters). In case of flaws and errors, the testing ensures to manage it and make the result reliable.

Reliability Testing

It is necessary to check on the various disconnections when an API is connected to more than a single device. Reliability testing is all about checking the above-mentioned need. The testing will make sure that the API will work without hassles and errors in any specific environment.

API Documentation Testing

Documentation is a critical process and stage for the software development team. The API document encloses the vital phases that are essential for using the testing. The API documentation talks about the challenging requirements and technical/engineering needs.

Security Testing

It covers the security-related needs of the API such as permission grants, access controls, and authentication. It reveals the security structure of API – authentication, encryption (to keep data safe), and authorization.

Negative Testing

The procedure of negative testing will check if the API is prepared in such a way that it can handle and manage the sudden/irrelevant user responses in an organized manner.

Top API Testing Tools of The Existing Business Scenario

  • SoapUI
  • Postman
  • Katalon Studio
  • Swagger
  • Assertible
  • Karate DSL

Process of API Testing

The process is established by connecting the application data to the API tests. It will make sure that the API works according to the criteria and input configuration.

  • Setting up the API testing and utilizing a testing environment
  • Setting up the vital parameters that are essential for API
  • Configuring the database/server as per the application requirements
  • Inducing an API to check if there is anything broken
If the above-mentioned stages are accurate, you can move towards an excellent testing process. Also, certain points that need to be organized – target audiences (API customers), testing problems, testing aspects, normal/abnormal circumstance scenario, priorities, API environment, and so on.

What are the Foremost Benefits of Using the API Testing in the Development Process?

The API tests focus on improving the product (software) development process, thereby, rendering quality-based services to the users. Here’s a look at the topmost reasons that states the importance of testing.


Developing API tests is critical during the product development stages and these tests should successfully check the API. In case it turns out to be unsuccessful, you need to create the API tests after the development process. One of the errors behind such a concept is that you are concentrating more on the performance of API rather than looking out for various loopholes. When you incorporate the testing, using a tool named Selenium, you can accomplish powerful API tests. These tests will impact the overall quality and performance of API.


API tests focus on analyzing how an API integrates with various APIs. The testing procedure assists in verifying the codes and detecting the bugs (existing in the code). Other roles of the testing include identifying the issues in code and ensuring that the functionality meets the user’s expectations. API testing is an inseparable part of the development process as it ensures the finest performance of the final product.

Agile Methodology

There has been a tremendous use of the agile methodology in recent times. Performing the GUI (graphical user interface) tests won’t be sufficient as it can’t give the desired results. It is not efficient to put the testers into work mode only when the developers are done with their part. API testing should be a continuous and agile process. It is important to check and verify the complete application at the API stage and this can be achieved only if the testing team works in an agile mode. The testing should be initiated at the foremost stage of product development and should be covered at all levels.

Test Presentation

While creating a quality-rich product, it is important to cover the software details from all aspects. Such a measure will develop trust among customers and enhance product credibility. Conducting the testing during the development stage can reveal the multiple issues within the server, API, and network. These issues cannot be solved if the product reaches the last stage. Once the product reaches the final production level, you will have the accountability to create new tests for the upcoming cases. API testing will contribute to the creation of an agile environment.

Test Reusing

The benefit of testing is that these tests can be run in various environments. Duplicating, reusing, and sharing the tests is also possible and effective. You can create an API test for the initial stages which can also be used by the development team in the production phase. The re-usability concept can enhance the quality and effectiveness of the testing procedure.

Testing Pyramid

When you talk about a standard testing pyramid, it covers three tests:
  • Unit Test
  • Server Test
  • UI Test

And, to be noted, testing is covered in the server test section.

Few Suggestions to be Implemented Before the Use of API Testing Tools

  • Testing the possible and desired outcome
  • Test for failure to understand the failure points of API
  • Utilizing API function calls
  • Using the group tests
  • Using increased variables
  • Automating the API tests via the testing tools

So, Here’s A Pack Up!

The software development service or the web application development process includes designers, programmers, testers, and business professionals. Making use of API testing in the initial stages of product development can yield beneficial outcomes.

Being one of the best software development company, Allianze InfoSoft ensures to render credible and affordable testing process to yield the best efficiency. Our developers guarantee to pay close attention to the testing via a perfectly organized workflow. To get a free quote and effective API results, know our crew at [email protected]