The expectations of end users from their softwares have increased manifold.

From doing magnificent jobs to interacting with other softwares in ways that appeared out of the question.

In order to meet this piling up user expectations, companies irrespective of their size are relocating their focus to DevOps and adopting API Driven software architectures.

This is leading them to a new kind of a risk: API Vulnerabilities.

So this article talks about the significance of API Testing and make sure to check out our top 3 recommendations of marketable and voguish API testing tools that can make your API testing more savvy.

Before we move ahead talking about the importance of API Testing, it is essential to know what API actually is.

API stands for Application Programming Interface.

To make it easier for you to understand, envision API as a brain with a specific impulse activating individual neuron.

Similarly, any company can fabricate an application t​hat sends an impulse to a public API and collect responses.

This allows smooth and coherent conveyance.

This also empowers information exchange between diverse software systems from multiple software companies.

One excellent real-world example of how APIs are used by developers to integrate softwares developed by other companies is Uber’s Smartphone app.

Uber itself cannot compute the course, when you book a ride.

Alternatively, it calls Google Maps API and waits for a response.

The whole operation is so smooth that, it seems everything is happening within the app itself.

The aim of API testing is to make certain that API and its integrations function in an excellent possible​ manner and don’t contain any susceptibility that might help attackers compromise the server as well as the client.

There are several types of API Testing:

  1. Validation Testing: ​This is high level testing whichseeks to answer whether API meets product essentials.
  2. Functional Testing: ​An extensive methodology oftesting multiple methods within the codebase to evaluate a slice of functionality in the system to check if the system is doing what is expected out of it.
  3. Unit Testing:​Unit testing tests individualoperations to determine whether the code is working right.
  4. Load Testing: ​Ascertains API’s ability to handleedge use cases and focuses on performing under load. It is generally accomplished by reutilizing functional test cases.
  5. Runtime Error Testing: ​This testing looks forerrors and defects detected during application execution.
  6. Security Testing: ​Security testing tests what typeof authentication is needed to access the API and also looks into potential issues in the way data is transmitted over the network.
  7. Web UI Testing:​Web UI testing validates GUIitems in terms of end to end integration.
  8. Fuzz-Testing: ​Fuzz testing determines how the APIhandles enormous amounts of totally random data.

API Testing Best Practices:

API gives the latest applications and services their value.

The reason why API testing has become such a crucial part of the software testing process.

It is becoming easier to execute complex API tests and credit goes to modern API testing tools.

But even the output of best of the best tools depends upon the capabilities of its user.

Thus, it is important for the user to know the best API testing practices.

  1. It is best to write a test keeping debugging in mind as the test may fail due to various reasons ranging from flawed functionality to environmental failure or version incompatibility between the product and the test.
  2. It is important to test your design in a manner that it can run under various System Under Test (SUT). Such flexible tests respond to real world demand of products in a better manner.
  3. It is also crucial to know what not to test.
  4. It is also significant to note that it is crucial to add stress on the system for unforeseen problems and invalid parameters.
  5. It is very significant to automate as much as possible.

Popular API Testing Tools:

1. SoapUI

It is the most famous API testing tool which covers almost everything on the net ranging from web inspection to functional testing to development to the compliance and load testing.

The first version of SoapUI was released in 2005.

It provides substantial options for scripting.

SoapUI makes it possible to fabricate complex testing scenarios and add custom functionality.


Started as a chrome browser plugin it is now a full fledged API Testing solution used by 5 million developers and more than 10k companies around the globe.

Postman allows you to attach test scripts to requests and build test integration suites or scripts to pass data.


It is a free and cross platform automation API testing tool which is built on top of open source frameworks of Appium and Selenium.

First released in 2015, with a lucid interface it provides a very unique keyword- driven approach to API Testing.

It has a built-in integrated development environment.

It is available for Windows, macOS, and Linux and comes with a browser add-on that records user actions in web applications and generates test scripts called Kalaton Recorder.


Although the one size fits all approach doesn’t go well with API Testing but still there are certain best practices which are crucial to keep in mind.

Modern API testing tools has made it easy to automate and execute complex API test.

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