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Head-to-head · JavaScript Testing Frameworks

Mocha vs Karma

  • Updated Oct 2026
  • Both researched from official sources
  • 4 checks side by side
Higher score Mocha #4 in JavaScript Testing Frameworks 8.6/10 Open source ✓ 1 of 4 features Visit Mocha
Karma #5 in JavaScript Testing Frameworks 8.3/10 Free plan Free plan✓ 3 of 4 features Visit Karma

Mocha leads on 0 checks, Karma on 0, and 4 are even. Who comes out ahead on the 4 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreMocha · 8.6/10
  • Free planonly Karma
  • Most featuresKarma · 3 of 4

Mocha scores higher on our rubric for javascript testing frameworks: 8.6 against 8.3 out of 10; our editors rank them #4 and #5.

Mocha is the better fit for flexible Node.js and browser test suites. Karma is the better fit for teams running JavaScript tests across real browsers.

  • Mocha fits best

    Flexible Node.js and browser test suites

  • Karma fits best

    Teams running JavaScript tests across real browsers

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Side by side

Feature Mocha 8.6/10 Visit ↗ Karma 8.3/10 Visit ↗
At a glance
Editor score 8.6 8.3
Ranking #4 in JavaScript Testing Frameworks #5 in JavaScript Testing Frameworks
Best for Flexible Node.js and browser test suites Teams running JavaScript tests across real browsers
Pricing model Free Free
Starting price Open source Free plan
Free plan Not checked yet ✓ (best)
Free trial — —
Deployment Cloud Self-hosted
Platforms Web Web, Windows, macOS, Linux
Support Community, Docs Community, Docs
Integrations 5 integrations 4 integrations
Built for Solo, Small business, Mid-market, Enterprise Solo, Small business, Mid-market, Enterprise
Features Mocha 1/4 · Karma 3/4
Component testing Not checked yet ✓ (best)
Coverage reporting Not checked yet ✓ (best)
Snapshot testing Not checked yet Not checked yet
Parallel execution ✓ ✓
Specs
Supported runtimes Not checked yet Node.js
Parallel workers Not checked yet Not checked yet
Our review
Pros
  • Supports callback, Promise, async/await, and synchronous tests
  • Offers hooks, retries, configurable timeouts, and parallel Node.js execution
  • Runs in browsers and supports TypeScript execution and external assertions
  • Runs JavaScript tests in multiple real browsers
  • Supports watch mode, coverage, plugins, and parallel execution
  • Works with Jasmine, Mocha, QUnit, and Istanbul
Cons
  • Parallel execution is documented for Node.js only
  • Does not provide built-in mocks
  • Does not include snapshot or property-based testing
  • The project is deprecated and accepts no new features
  • General bug fixes are no longer accepted
  • Requires Node.js, browser configuration, and plugin setup
Our verdict

Mocha is an open-source JavaScript testing framework for developers working on applications and libraries in Node.js or web browsers. It supports JavaScript and TypeScript test execution, with workflows ranging from synchronous tests to…

Read the review →

Karma is an open-source JavaScript test runner for teams that need to execute browser-based tests in connected real browsers. Installed as an npm package, it runs on Node.js and launches a local web server for test execution. Karma can…

Read the review →
  1. MochaJavaScript Testing Frameworks 8.6Open source
  2. KarmaJavaScript Testing Frameworks 8.3Free plan

Strengths and trade-offs

  • Mocha — where it wins

    • Supports callback, Promise, async/await, and synchronous tests
    • Offers hooks, retries, configurable timeouts, and parallel Node.js execution
    • Runs in browsers and supports TypeScript execution and external assertions

    Where it doesn't

    • Parallel execution is documented for Node.js only
    • Does not provide built-in mocks
    • Does not include snapshot or property-based testing

  • Karma — where it wins

    • Runs JavaScript tests in multiple real browsers
    • Supports watch mode, coverage, plugins, and parallel execution
    • Works with Jasmine, Mocha, QUnit, and Istanbul

    Where it doesn't

    • The project is deprecated and accepts no new features
    • General bug fixes are no longer accepted
    • Requires Node.js, browser configuration, and plugin setup
  • Mocha8.6/10 · Open source

    A flexible framework for asynchronous JavaScript and TypeScript test suites.

    Visit MochaFull verdict →
  • Karma8.3/10 · Free plan

    A flexible open-source runner for real-browser tests, but its deprecated status limits future use.

    Visit KarmaFull verdict →

More comparisons

All JavaScript testing frameworks comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update