According to Zion Market Research, Global API Management Market to Register $3,436.16M Growth by 2022.

APIs are becoming an integral part of how a software works. The more we rely on web-based systems, the more crucial it is that the API Testing is done properly and are available for consumers.

In this post, I will outline 10 API testing tools you should try this year.

API Testing tools are divided into two categories,

Hosted & Open-source

  • Open source API testing tools
  • Hosted API testing tools (free and paid)

Open source API testing tools


It is a famous open-source testing tool for web services testing as well as API testing. SoapUI’s functionality is mainly used for web service check, invoking, development, simulation and mocking, load testing, compliance testing and functional testing services.

Dredd (Command-line)

This is a command-line tool especially to validate an API based application on a formal definition like Swagger or API Blueprint.

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The tool is capable of validating responses against expectations defined in the specification.

This command line tool is seamless to perform API testing from a CI/CD pipeline and also it supports defining advanced tests in many programming languages including ‘Go’ and ‘Python’.

Swagger-test-templates (Command-line)

This is a code generator used to generate API test-suites depending on a Swagger definition. It also generates test suite’s code in Javascript using familiar libraries such as Mocha JS, Chai JS, and Commander JS.

Karate DSL (Command-line)

Karate is a testing framework, which uses a BDD i.e. Behaviour-Driven Development, the domain-specific language for defining API tests.

Karate is built on top of the Cucumber-JVM which should make it familiar to anyone used to using Cucumber for BDD tests.

The main advantage of Karate is that it seamlessly supports the integration of CI / CD pipelines and can support testing live environments like dev, QA, or pre-prod. Karate has very comprehensive support for common HTTP calls that use SOAP/XML, HTTPS, HTTP proxies, URL-encoded form data, multi-part file uploads, and more.

Chakram (Javascript library)

This is a framework used to REST API testing and specially designed to perform end-to-end tests on JSON REST endpoints.

Chakram uses a BDD style syntax, which is written in Javascript and offers a comprehensive set of HTTP declarations and hooks for extending test behavior.

The tool is built on Node.js, Mocha, Chai, and Request. Check out the source code on GitHub.

Frisby.js (Javascript library)

Frisby is a REST API testing framework, which is built on Node.js and Jasmine (a BDD style test-runner) that makes testing API endpoints simple, easy, and fast.

With the soon-to-be-released Frisby.js 2.0, there are many improvements for extensibility and exposure to the underlying Jasmine test structure, which makes it familiar for those already running Jasmine, based tests.

Using jasmine-node test runner, Frisby tests is able to run in a continuous integration mode or delivery pipeline.

Hippie (Javascript library)

Hippie is a simple Javascript DSL for testing APIs. It supports a clean assertion syntax, middleware for extending test behavior, and the ability to print clean reports with diffing capabilities.

Hippie has an extremely clean API and makes it dead simple to write standalone scripts that can be automated CI / CD pipeline before or after deployments.

Hippie also has another package specifically designed to test APIs with a Swagger definition called hippie-swagger.

Hosted tools


Assertible is an API testing tool that focuses on reliability and automation. This tool also supports HTTP response validation with turnkey assertions such as JSON Schema validation and JSON Path data integrity checks.

One major advantage of Assertible is its support for automating API tests through each step of a continuous integration and delivery pipeline.

It also supports running API tests after deployments and integrates with familiar tools like GitHub, Slack, and Zapier.

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Postman is a GUI API Testing client that supports exploratory testing, documentation, sharing and monitoring.

Even though Postman is a competing product with Assertible, it is a very strong product and has a wide set of nice features for API testing.

One big advantage of using Postman is that it runs on the local machine, which allows control of data. Some companies follow security restrictions which may prevent using a fully hosted option. Postman also supports running tests in a continuous integration pipeline using Newman.

Apex Ping

Apex Ping is a simple uptime-monitoring tool. The tool is highly recommended for simple software health checks.

Apigee API Studio

APIGee’s API Studio is for constructing APIs, which has few neat features designed to make testing easier. One can try this operation for API Response Simulation with mocked HTTP responses.

API Studio is still in Beta so it is expected that the producers will release even more API testing features.

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These blogs have been carefully curated by the content management team at Indium Software. Read our blogs to enjoy the best of the world of technology.

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