A header-based unit testing framework for C++ with simple assertions, BDD-style macros, and basic micro-benchmarking.
21.5K+3 this week3.4KC++BSL-1.0Updated 17 days ago
mochajs/mocha
A widely used JavaScript test framework for Node.js and the browser, providing describe/it-style test structure and async test support.
- Stars
- 22,910
- Forks
- 3,139
- Open issues
- 232
- Last commit
- 11 hours ago
What is it?
Mocha is a JavaScript test framework that runs in Node.js and in the browser. It gives developers a structure for organizing test suites and individual test cases, and it runs them asynchronously, so tests that involve callbacks, promises, or async functions can be written naturally.
Mocha is a runner rather than an assertion library, so it is typically paired with an assertion tool such as Chai or Node's built-in assert module. It supports multiple interface styles, including BDD (describe/it) and TDD, and it is available as a command-line tool. The project is maintained under the OpenJS Foundation and is one of the most depended-upon modules on npm.
Key features
- 01Runs tests in both Node.js and the browser.
- 02Supports BDD (describe/it) and TDD interface styles.
- 03Handles asynchronous tests using callbacks, promises, and async/await.
- 04Provides a command-line tool for running test suites.
- 05Works with any assertion library, such as Chai or Node's assert.
Use cases
- Writing unit tests for Node.js backend services or libraries.
- Running browser-based tests for front-end JavaScript code.
- Adding a structured test suite to an existing JavaScript project.
Quick start
- 1
Install Mocha as a dev dependency with npm
npm install --save-dev mocha
Things to know
- Maintained exclusively by volunteers.
In collections
Topics
FAQ
- What is mocha?
- A widely used JavaScript test framework for Node.js and the browser, providing describe/it-style test structure and async test support. Mocha is a JavaScript test framework that runs in Node.js and in the browser. It gives developers a structure for organizing test suites and individual test cases, and it runs them asynchronously, so tests that involve callbacks, promises, or async functions can be written naturally.
- Is mocha free to use? What license does it have?
- mocha is open source under the MIT license. Check the license terms before using it in commercial products.
- Is mocha still maintained?
- Actively maintained. The last commit to mocha was on Oct 24, 2026.
- What can I use mocha for?
- Writing unit tests for Node.js backend services or libraries. Running browser-based tests for front-end JavaScript code. Adding a structured test suite to an existing JavaScript project.
- How do I install mocha?
- Install Mocha as a dev dependency with npm: npm install --save-dev mocha
- Where can I get mocha?
- The source code and installation instructions are on GitHub: https://github.com/mochajs/mocha
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