Jest vs Karma

Jest9.2Visit Karma8.3Visit

Higher score Jest #2 in JavaScript Testing Frameworks 9.2/10 Free plan Free plan✓ 2 of 4 features Visit Jest

vs

Karma #5 in JavaScript Testing Frameworks 8.3/10 Free plan Free plan✓ 3 of 4 features Visit Karma

• Jest fits best

  Established JavaScript and TypeScript application teams

• Karma fits best

  Teams running JavaScript tests across real browsers

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Side by side

Feature	Jest 9.2/10 Visit ↗	Karma 8.3/10 Visit ↗
At a glance
Editor score	9.2	8.3
Ranking	#2 in JavaScript Testing Frameworks	#5 in JavaScript Testing Frameworks
Best for	Established JavaScript and TypeScript application teams	Teams running JavaScript tests across real browsers
Pricing model	Free	Free
Starting price	Free plan	Free plan
Free plan	✓	✓
Free trial	—	—
Deployment	Self-hosted	Self-hosted
Support	Community, Docs	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Jest 2/4 · Karma 3/4
Component testing	Not checked yet	✓ (best)
Coverage reporting	Not checked yet	✓ (best)
Snapshot testing	✓ (best)	Not checked yet
Parallel execution	✓	✓
Specs
Supported runtimes	Not checked yet	Node.js
Parallel workers	Not checked yet	Not checked yet
Our review
Pros	Combines assertions, mocks, snapshots, coverage, and test execution Supports parameterized and concurrent test execution Integrates with Babel, webpack, Parcel, React, Angular, and Vue	Runs JavaScript tests in multiple real browsers Supports watch mode, coverage, plugins, and parallel execution Works with Jasmine, Mocha, QUnit, and Istanbul
Cons	Self-hosted distribution requires teams to manage their own environment TypeScript support runs through Babel or ts-jest Property-based testing is not a built-in feature	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	Jest is an open-source JavaScript testing framework for teams building and maintaining JavaScript and TypeScript applications. It combines command-line test execution with matchers and assertions through the expect API, mock functions and… 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 →

Strengths and trade-offs

• Jest — where it wins

  • Combines assertions, mocks, snapshots, coverage, and test execution
  • Supports parameterized and concurrent test execution
  • Integrates with Babel, webpack, Parcel, React, Angular, and Vue

  Where it doesn't

  • Self-hosted distribution requires teams to manage their own environment
  • TypeScript support runs through Babel or ts-jest
  • Property-based testing is not a built-in feature

• 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

• Jest9.2/10 · Free plan

  A complete open-source toolkit for established JavaScript and TypeScript teams.

  Visit JestFull 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 →