What is Mocha used for?

Mocha is a feature-rich JavaScript test framework for Node.js and the browser, supporting asynchronous testing and serial test execution. It is a good fit for testing JavaScript applications in Node.js or the browser, writing unit tests for libraries or modules and running asynchronous test suites.

Is Mocha open source?

Yes. Mocha is open source under the MIT licence. Its source code is on GitHub at mochajs/mocha and is written mainly in JavaScript.

Yes. Mocha is open source, so the software itself is free to use.

Can I self-host Mocha?

Yes. Mocha can be self-hosted on your own server or infrastructure.

What is Mocha an alternative to?

Mocha is an open-source alternative to Katalon and Parasoft. Other open-source alternatives to Katalon include Jest, Cucumber Js and Playwright.

Is Mocha actively maintained?

Yes. The most recent commit to Mocha was on 13 October 2026, and the latest release is v12.0.3, published on 1 October 2026. The project has 23k stars on GitHub.

Mocha: open-source alternative to Katalon, Parasoft

About Mocha

Mocha is a JavaScript test framework that runs on Node.js and in the browser. It supports asynchronous testing and runs tests serially, which allows for flexible and accurate reporting.

The framework maps uncaught exceptions to the correct test cases. It includes features such as hooks, timeouts, parallel mode, and various interfaces and reporters.

Key features

Runs on Node.js and in the browser
Supports asynchronous testing
Tests run serially for accurate reporting
Maps uncaught exceptions to correct test cases
Includes hooks, timeouts, and parallel mode
Offers multiple interfaces (BDD, TDD, etc.) and reporters

Good fit for

Testing JavaScript applications in Node.js or the browser
Writing unit tests for libraries or modules
Running asynchronous test suites

Built with: JavaScript tools; Node.js tools
Tags: javascript; testing; nodejs; browser; framework

Mocha: questions and answers

What is Mocha used for?: Mocha is a feature-rich JavaScript test framework for Node.js and the browser, supporting asynchronous testing and serial test execution. It is a good fit for testing JavaScript applications in Node.js or the browser, writing unit tests for libraries or modules and running asynchronous test suites.
Is Mocha open source?: Yes. Mocha is open source under the MIT licence. Its source code is on GitHub at mochajs/mocha and is written mainly in JavaScript.
Is Mocha free?: Yes. Mocha is open source, so the software itself is free to use.
Can I self-host Mocha?: Yes. Mocha can be self-hosted on your own server or infrastructure.
What is Mocha an alternative to?: Mocha is an open-source alternative to Katalon and Parasoft. Other open-source alternatives to Katalon include Jest, Cucumber Js and Playwright.
Is Mocha actively maintained?: Yes. The most recent commit to Mocha was on 13 October 2026, and the latest release is v12.0.3, published on 1 October 2026. The project has 23k stars on GitHub.