Katalon is the leading low-code test automation solution for Web, API, Mobile, and Desktop apps.
Ever wondered how Google Maps was able to locate your current location and show you the nearest exit when you were stranded in the middle of god-knows-where?
Well, that’s Google Maps API doing the work.
An API (Application Programming Interface) is, in simple terms, the messenger that enables two software to share data and talk to each other. But how do an application remain fully functional, as it’s designed to every time, without compromising on user privacy? The answer is API testing tools.
Using API testing tools is how development and testing teams qualify software performance before they get to the users’ hands. Now guided by the principles of Agile, the main benefits QAs and developers are after include:
The number of API testing tools on the market for you and your team to try out and select will probably take forever. That’s why we have listed a few key considerations for you to keep in mind.
Recognized as the Gartner Peer Insights Customers’ Choices for Software Test Automation for three consecutive years, Katalon Studio is the leading test automation solution for API, Web, and Mobile and Windows applications.
Easy-to-use UI and productivity-centric features for projects of all sizes
Supports REST, SOAP requests, and SSL client certificates
Enable test import from Swagger (2.0 & 3.0), Postman, WSDL, and WADL
Native CI/CD integrations (Jenkins, Azure DevOps, CircleCI, Dockers, etc.)
Data-driven testing methods better test coverage and reliability
AssertJ support to create fluent assertions in BDD style
Support API test data setup using UI testing
Built-in reporting platform to centralize reports and activities across tool stacks: version control systems, CI/CD, test automation tools, and ALMs
Free API testing courses and tool tutorials on Katalon Academy
Pricing: Free — $69/license/month
Originally a Chrome browser plugin, Postman extended to an on-premise solution for both Mac and Windows.
Users could share the knowledge with the team at ease as they can package up all the requests and expected responses, then send them to their coworkers.
In version 7.3 of 2020, Postman uses new advanced preferences to help users smartly organize the collections and API elements (mock servers, monitors, tests, and documentation) generated from API schemas. Also, you could manage your team’s public data and share links to all items in the workspace, such as collections, requests, APIs from Postman app.
Pricing: Free – $12/user/month
This tool is designed for digital businesses and the data-rich mobile-driven APIs and apps that power it. Since version 4.19.01 in 2019, Apigee gives users more flexibility to manage their APIs with features (e.g., Open API 3.0 support, TLS security, Self-healing with apigee-monit, Virtual host management improvements). Now, the latest version is enhanced with minor bug fixes and security improvements. Overall, it is feature-rich and well recognized by users.
Pricing: Contact Sales
Initially, JMeter was created for performance testing, however, it is commonly used for functional API testing.
The latest release JMeter 5.4.1 is packed with versatile features and enhancements such as new themes, bug fixes, visual representation of disabled elements, revamped Groovy library, and updated JMeter templates for functional testing. This tool is most suitable for Web application performance and load testing.
This open-source Java Domain-specific language enables testing REST services more simply. It can be used to validate and verify the response of these requests.
Version 4.0.0 required at least Java 8, offered support for Apache Johnzon, and fixed many issues with the initial OSGi support. The latest version 4.4.0 is released with various improvements and bug fixes.
In October 2019, Assertible added the Encrypted variables feature, which provides a new way to store passwords, tokens, and secret data fields. This offering is to improve API testing security practices.
Pricing: Free – $25/month
The latest version SoapUI 5.6 has updated third-party libraries (org.apache.HTTP components, commons-logging, commons-codec, and JUnit) and removed unused third-party libraries such as Jackson, KeenIO.
Update: SoapUI now disables the Load and Save project scripts by default to enhance testing security.
Pricing: Free – $749/year
The latest revision, Karate UI 1.2.0, was released with a slew of new features, including redesigned HTML reports, call-Single-Cache, Karate Robot Windows for Windows Desktop app automation, and enhanced tree walking in UI Tests. Also, Karate UI allows you to write tests in any language that can handle HTTP, JSON, or XML.
The most recent release, Rest Console v4.0.2 has been upgraded with several features to enhance user experience and bug fixes (e.g., oAuth improvements, Collapsible sections, Clickable Links in Response, UI enhancements).
The latest version in September 2020 offers many new features which allow a test to continue after a fatal error, improve multipart for on-prem and load testing, and K/V store for mocking services. API Fortress is free to use and easy to customize to the specific requirements of your project.
Pricing: Contact sales
It is a Python-based REST API testing platform that supports tests in JSON or YAML config files, no coding knowledge is required.
In 2016, the latest version, v1.7.1 was released with a fixed JSONschema extension in Python 3 and added test coverage. This tool is best used for RESTful APIs.
Taurus is a free and open-source framework for simple and direct API testing because it is easy to learn. Taurus helps you hide the complexity of running performance tests without learning any programming languages; instead, all you need to understand is the basic YAML structure of Taurus.
Taurus v1.15.4 updates various features, improves user experience, and fixes bugs.
The tests provide a Java fluent API to specify the test logic and are fully automated. Citrus can act on both sides as a client or a consumer during the test when replacing the actual request/response message over the wire.
Citrus 3.1.0 is the latest stable version. It is available in the central Maven repository so that you can add Citrus as a Maven dependency to your project. It’s a free, open-source tool with custom scripting functionalities that you can utilize your programming skills to fit project requirements.
In 2020, Airborne was updated to version v0.3.5 with minor bug fixes. It is a free-to-use and open-source API testing tool that testing teams may use to meet their requirements.
Although we have introduced some of the best testing tools on the market, it is essential to keep the pros and cons in mind. You may need to be flexible in trying various options before finding the one that best suits your requirements. Click the button below to learn more about Katalon solutions.