Karma

JavaScript Testing Frameworks

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Overview

Karma is a JavaScript test runner that starts a web server, connects browsers, runs tests, and reports results to developers. It can watch configured files and rerun tests when they change. Plugins connect frameworks such as Jasmine, Mocha, and QUnit, alongside preprocessors, reporters, and browser launchers. Documented launchers include Chrome, Firefox, Safari, PhantomJS, JSDOM, Opera, Internet Explorer, SauceLabs, and BrowserStack. A browser on another device on the same network, including a phone or tablet, can be captured by visiting the Karma server URL. Karma runs on Node.js and is distributed as an npm package; its installation guide recommends installing it locally in a project. Documentation includes integration guides for Travis CI, Jenkins, and Semaphore CI. The project describes Karma as primarily designed for low-level unit testing and points to Protractor for high-level testing. Karma is free and MIT-licensed, but deprecated: it accepts no new features or general bug fixes. Critical security fixes continue until 12 months after Angular CLI’s Web Test Runner support is marked stable.

Who it is for

Karma suits developers who want local, multi-browser tests, reruns on file changes, or CI test runs. The project describes it as primarily for low-level unit testing.

What is good

Runs tests across configured real browsers.
Watches files and reruns tests after changes.
Plugins support Jasmine, Mocha, and QUnit.
MIT-licensed and free.

What to know first

Deprecated; no new features or general bug fixes.
Primarily designed for low-level unit testing.
Critical security fixes have a stated support end point.

Verdict

Karma offers browser-based test execution and plugin-based framework support, but its deprecated status is a significant consideration. It remains free under the MIT license, with critical security fixes continuing only through the stated support period.

Karma plans and pricing

All plans

Karma Free MIT-licensed open-source software · deprecated; no new features or general bug fixes github.com · 29 Sept 2026

Compared on JavaScript testing frameworks

Free plan: Yeskarma-runner.github.io
Component testing: Yeskarma-runner.github.io
Coverage reporting: Yeskarma-runner.github.io
Supported runtimes: Node.jskarma-runner.github.io
Parallel execution: Yeskarma-runner.github.io

Facts

Purpose: Karma runs JavaScript tests in multiple real browsers and reports results to developers.github.com · 29 Sept 2026
How it works: Karma starts a web server, connects browsers, runs tests in them, and displays their results.karma-runner.github.io · 29 Sept 2026
Automatic reruns: Karma watches configured files and reruns tests when a file changes.karma-runner.github.io · 29 Sept 2026
Testing frameworks: Plugins are available for Jasmine, Mocha, QUnit, and other testing frameworks.github.com · 29 Sept 2026
Browser launchers: Documented launchers include Chrome, Firefox, Safari, PhantomJS, JSDOM, Opera, Internet Explorer, SauceLabs, and BrowserStack.karma-runner.github.io · 29 Sept 2026
Manual device capture: A browser on another device, including a phone or tablet on the same network, can be captured by visiting the Karma server URL.karma-runner.github.io · 29 Sept 2026
Plugin model: Preprocessors, reporters, browser launchers, and framework adapters are plugins that can be installed from npm or written for Karma.karma-runner.github.io · 29 Sept 2026
CI integrations: The documentation provides integration guides for Travis CI, Jenkins, and Semaphore CI.karma-runner.github.io · 29 Sept 2026
Installation: Karma runs on Node.js, is distributed as an npm package, and the installation guide recommends installing it locally in the project.karma-runner.github.io · 29 Sept 2026
License: Karma is released under the MIT license.karma-runner.github.io · 29 Sept 2026
Maintenance status: Karma is deprecated and is not accepting new features or general bug fixes; critical security issues will still be triaged and fixed during the stated support period.github.com · 29 Sept 2026
Security support period: The repository says critical security fixes will continue until 12 months after Angular CLI's Web Test Runner support is marked stable.github.com · 29 Sept 2026
Who it is for: The project describes Karma as useful for developers who want to run tests locally, in multiple browsers, on each save, or on a continuous integration server.github.com · 29 Sept 2026
Testing scope: The FAQ says Karma was primarily designed for low-level unit testing and recommends Protractor for high-level testing.karma-runner.github.io · 29 Sept 2026
Support: The project directs questions to its mailing list or Gitter and says the issue tracker is for bug reports and feature discussions.github.com · 29 Sept 2026