Wallaby.js is an intelligent and super fast test runner for JavaScript that continuously runs your tests. It reports code coverage and other results directly to your code editor, immediately as you change your code. Wallaby.js is insanely fast, because it only executes tests affected by your code changes and runs your tests in parallel. The tool provides a huge productivity boost whether you are doing TDD/BDD or using any other approach.

Where can I download wallaby.js for my editor?

Wallaby.js for products based on IntelliJ Platform (WebStorm, PhpStorm, RubyMine, IntelliJ IDEA or PyCharm).

Wallaby.js for Visual Studio 2013 (Community, Professional, Premium, Ultimate).

Wallaby.js for Visual Studio 2015 (Community, Professional, Enterprise).

To get the version of wallaby.js for Atom editor, please install the Atom-Wallaby package.

To get the version of wallaby.js for Visual Studio Code, please install the Wallaby.js extension.

To get the version of wallaby.js for Sublime Text, please install the Wallaby package via Sublime Text Package Manager.

To install the downloaded wallaby.js extension in your editor and get started, please follow these instructions.

Trial versions available for download are fully functional and should work for 30 days. Note that in the trial mode wallaby will sometimes prompt you to restart your editor to get another trial session. Please contact us if you would like to arrange a trial period for yourself or your team without activation prompts and restarts.

Who is using wallaby.js?

Thousands of individual professional developers and companies all over the world have already become more productive with wallaby.js. Even software development tools vendors, such as our friends from JetBrains, are trusting wallaby.js to help building other development tools.

Please contact us if you would like your company's or project's logo to be listed.

What are our users saying?

Show more happy users

How much does wallaby.js license cost?

There are no free tools, unless your time has no value. You may find our pricing and licensing details on the pricing page.

What is wallaby.js again?

Wallaby.js is an intelligent and super fast test runner deeply integrated into your editor or IDE. It runs your unit tests as you type and displays various results (including the code coverage) right inside your code editor. Wallaby.js is great for doing JavaScript TDD (Test-driven development) or BDD (Behavior Driven Development), while also working for other approaches.

What about a list of main features?

  • Supports continuous testing in your code editor:
    • WebStorm, IntelliJ IDEA Ultimate, PhpStorm, RubyMine, PyCharm Professional;
    • Visual Studio 2013 Update 4-5 (Community, Professional, Premium, Ultimate);
    • Visual Studio 2015 (Community, Professional, Enterprise);
    • Atom Text Editor;
    • Visual Studio Code;
    • Sublime Text.
  • Supports browser code unit testing (via PhantomJs, Electron or node.js) and node.js unit testing.
  • Supports many testing frameworks (Jasmine, QUnit, Mocha, Jest, and AVA).
  • Supports ES6 and React JSX.
  • Supports TypeScript, CoffeeScript, and ES7.
  • Supports Webpack and Browserify.
  • Extensible via preprocessors, compilers and more.
  • Runs tests affected by code changes.
  • Runs tests in parallel.
  • Runs selected test(s).
  • Shows live test coverage.
  • Shows failed expectations, errors and console.log messages inline, where and when they occur.
  • Shows executed test data.
  • Captures test execution screenshots.

Where can I find more information about wallaby.js, such as tutorials and samples?

You can find more information, detailed tutorials and sample project links in our documentation.

How is it different from Karma, Mocha runner, etc.?

With other test runners you need to run tests manually, or configure them to run tests when you save your source code. They run all of your tests, and as your project grows, it takes more and more time to run all of the tests. Test execution results are displayed somewhere outside of your code editor, and that makes you pay the price of context switching to see the results.

Wallaby.js runs your unit tests immediately as you type, no need to run anything manually or even save files. The tool calculates and runs the minimum required number of tests affected by your code changes, so no matter how large your project grows - the feedback is almost instant. Test execution results, including code coverage, are displayed and updated in real time right where you need it — in your code editor, next to the line of code that you're editing.

Can I use wallaby.js with Jasmine, Mocha, QUnit, AVA, or Jest?

Yes. You can use your favorite testing framework, mocking framework (such as Sinon.js), assertion library (such as Expect.js, Should.js, Chai.js, Jasmine built-in one, etc.) with wallaby.js.

Do I have to use some new API or change my tests/code to run them with wallaby.js?

No. Wallaby.js just makes your code editor smarter and your tests to run faster. No need to switch and invest into new frameworks, commands, or APIs - just use your existing testing libraries.

Does wallaby.js support Angular.js, React, Backbone.js, Aurelia, etc.?

Yes. As long as you can write tests for your application, wallaby.js can run them. Check out our tutorials for testing Angular.js and React applications.

What about node.js?

Wallaby.js supports node.js testing. In fact, wallaby.js is written in node.js and we write tests for wallaby.js using wallaby.js.

What about ES6/ES2015/Harmony or React JSX?

Wallaby.js supports ES6/ES2015 and JSX. ES6 is supported both natively for engines that can execute it and via code transpilers, such as Babel. You can see realtime coverage for your generators, classes, arrow functions and much more with wallaby.js. For JSX, not only does wallaby.js understand its syntax, but it also displays coverage inside JavaScript expressions within JSX elements.

What about TypeScript, CoffeeScript, ES7 experimental features or Flow?

Wallaby.js has zero-configuration support for TypeScript and CoffeeScript. Babel is also fully supported.

What about Browserify or Webpack?

Wallaby.js supports both Browserify and Webpack via open source plugins. These plugins not only use incremental compilation, but also leverage browser caching to provide the best performance.

What about code preprocessors like in Karma?

Wallaby.js supports Karma-like preprocessors. Simply provide a function invoking an existing node module.

Do I have to install and use new standalone applications with wallaby.js?

No. All you need to install is the wallaby.js plugin for your code editor, period. No additional standalone applications, new command line tools or browser plugins. Our goal is not to add more things between you and the feedback from your tests. In fact, it's the opposite: wallaby.js eliminates any unnecessary context switching, so it's just you and your test feedback, right where and when you write your code.

Do I have to use TDD with wallaby.js or do I have to write my code first?

Wallaby.js is agnostic of any software development techniques. It helps you be more productive whether you're doing JavaScript TDD, writing tests after, or using any mixed approach.

Who stands behind wallaby.js?

At the core of our team are professional JavaScript developers and professional development tools makers. Not only do we know and love the language and the ecosystem, but we have also dedicated our careers to making programmers happier and more productive.

Where is your changelog, and what does the roadmap for wallaby.js look like?

Our changelog is in our public repository.

Wallaby.js roadmap:

How can I contact you?

Please feel free to send us an email to [email protected] or a message on twitter @WallabyJs and we will get back to you shortly.

How can I subscribe to wallaby.js news?

Follow us on twitter @WallabyJs to receive all the latest news.

We also send out project updates about once a month or two months. Have a look at our past newsletters to decide if they’re worth subscribing to.