Published on May 6th, 2022 | by Ali Dino


The 5 Best API Testing Tools in 2022

API automation tests are significant components of effective software testing. Automation is an essential part of your development team to work on productivity. Manual testing is a time-consuming and error-prone process that you can easily avoid with test automation tools.

API testing has become significant with the ascent in cloud applications and interconnected platforms. Most of the services we utilize every day depend on various interconnected APIs, and if one of them doesn’t work as expected, then at that point, the whole service can be compromised. 

Luckily, there are many API testing tools available on the internet that can assist us with guaranteeing everything goes as seamlessly as expected. Here is a  curated list of the best 5 API testing tools in 2022 to help you choose the right one.

What is an API?

API stands for Application Programming Interface. An API is a computing interface that enables data exchange and communication between two different software frameworks.

A software system that executes an API incorporates a few capacities/subroutines that another software system can perform. API characterizes requests that can be made, how to make requests, data formats that can be utilized, and so on between two software systems.

On account of APIs, an application associated with the web can send the request (with information) to a server, and the server will analyze the request and interpret it. The vital actions are executed to send a reaction back to the application’s user interface with data.

What is API Testing?

API Testing is a software testing process that checks and validates Application Programming Interfaces (APIs). The reason for API Testing is to ensure the functionality, dependability, execution, and security of the programming interfaces of an application. 

In API Testing, rather than utilizing standard user inputs and outputs, you use software to send calls to the API, get results, and note down the framework’s reaction. API tests are different from GUI Tests and won’t focus on the look and feel of an application. 

API testing principally focuses on the business logic layer of the software or application. API testing tools permit testers to check various aspects, such as:

  • If an API is returning the normal response and in the right form at
  • If it responds sufficiently to edge cases 
  • whether it reacts securely to possible security attacks
  • The time it takes to convey a reaction.

Top 5 API Testing tools

Now, as you know very well about an API and API testing, let’s head toward our list of the five best API testing tools in 2022;

1. TestGrid

TestGrid API Testing Tool is a web-based API testing tool with an easy-to-use interface that is 70% faster than the conventional API testing methods to help you test quickly and deliver faster. You can draw in your teams to create and execute test cases with no requirements of programming knowledge.

The API automation tool by TestGrid gives a precise automation system and structure for engineers and testers for scriptless API testing, UI testing, and other fundamental authorization testing. 

TestGrid runs automated tests in a continuous pipeline to provide your development teams with quicker feedback while decreasing troubleshooting and resolution time. The platform works with most languages like Python, JavaScript, and others right out of the box.

Along with all these, the TestGrid API testing tool comes with some more amazing features, such as;

  • Easy-to-use user interface (UI)
  • API Automation for SOAP and REST calls
  • Transaction monitoring
  • Scriptless testing for faster automation

2. Katalon

Katalon is another free API testing tool for Web, Mobile, and Desktop applications. It gives simple development options by including all systems and modules in a single bundle. It is appropriate for both amateurs and experts with the manual and automated Scripting modes.

Katalon Studio offers easy and faster deployment by including all systems, ALM integrations, and modules in a single package. The ability to consolidate UI and API/Web services for different operating systems such as Windows, Mac OS, and Linux is additionally a benefit of Katalon Studio among the top API tools.

Katalon also supports REST and SOAP requests and gives numerous parameterization commands and features. Moreover, Katalon follows an information-driven approach, supports CI/CD tools, and permits testers to execute automated and exploratory testing.

Pros of using Katalon’s API testing tool;

  • Built-in reporting platform
  • Easy integration with CI/CD tools
  • Supports REST and SOAP requests
  • Supports AssertJ library

Cons of using Katalon’s API testing tool;

  • No support for distributed testing
  • Poor troubleshooting for issues
  • The complicated process of code debugging

3. Rapid API

RapidAPI is an API commercial center where many developers use the tool to find, test, and connect several APIs, all with a single account. On RapidAPI, you can work together on APIs with teams for internal and external APIs. Developers can also utilize RapidAPI Testing on their internal APIs with RapidAPI Hub.

RapidAPI Testing allows you to make adaptable practical test flows that give profound validation of REST, SOAP, and GraphQL APIs. A simple interface offers users three choices for test generation, enabling developers and non-developers to make visual, automated, or code-based test generation.

With RapidAPI, Guaranteeing API security is likewise simple with testing for any authorization and authentication technique, including OAuth 2.0/OpenID Connect, header approval, and injection flaw prevention.

Pros of using RapidAPI’s API testing tool;

  • Completely free to use
  • Supports multiple public APIs
  • Test numerous APIs in a single workplace
  • Enhanced API security

Cons of using RapidAPI’s API testing tool;

  • Complex user interface (UI)
  • Slow connection to APIs of other service providers
  • Poor code snippets for C# language

4. Copado

Copado is a low code, cross-cloud API testing tool, empowering users to analyze and test API execution, support, and build API. Copado’s API test automation supports the consistent development of the test frameworks in an adaptable way. 

IT teams of all sizes use Copado to speed up their testing by automating critical lifecycle parts like test configuration, planning, test generation, and execution. Copado enables its clients to save a considerable cost used in the maintenance and change efforts in testing, addressing one of the significant problems in the business. 

Copado makes this conceivable with an AI-controlled center to bring self-healing automation, among other special abilities. User experience and design are at the core of Copado’s consistent innovation approach with a relentless effort to speed up testing and improve delivery quality for its clients.

Pros of using Copado’s API testing tool;

  • Efficient cloud integrations
  • Self-healing AI
  • Low-code functionality
  • Provides predictive analytics

Cons of using Copado’s API testing tool;

  • Over-saturation of APIs in the marketplace
  • Compromised security due to an open-source environment
  • Increased chances of bugs and errors

5. Postman

After Copado, the next API testing tool is Postman. Postman offers a desktop app and a web application and can likewise be utilized for testing API services. It allows the user to share the information with the team easily.

Postman API Development Environment is separated into three sections, Collections, Workspaces, and Built-in Tools. Postman collections section will permit you to run requests, test and troubleshoot, execute automated tests, and mock, archive, and screen API.

Postman workspace provides you with the collaboration feature. It will enable you to share the collections, set permissions, and oversee participation in different work areas for any team size. Built-in tools will give the features required by the engineers to work with an API.

Postman API tool comes in three different plans. For small teams and individual testers, there is a free version. The next plan is Postman Pro, which is for a group of 50 individuals. The third plan is Postman Enterprise, and it very well may be utilized by a group of any size.

Pros of using Postman’s API testing tool;

  • Easy-to-use REST client
  • User-friendly and simple interface
  • Supports macOS, Windows, and Linux
  • Integration with Swagger and RAML formats

Cons of using Postman’s API testing tool;

  • A limited number of requests in the Enterprise version
  • Pricing for the Enterprise version is high
  • Does not support simultaneous API testing for more than one API


While picking an API testing tool, it is essential to consider how each of the various choices available in the market may be more suitable for specific purposes. At times, developers and testing teams might choose to go with more than one tool, considering that a single tool cannot fulfill its purpose.

Thus, out of all the five best API testing tools we have mentioned, you must go for the one that fulfills your requirement. Even though all options have unique features, we recommend you choose TestGrid for all API testing purposes. With TestGrid, you get the most easy-to-use AI-powered API testing platform.

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