The official JavaScript implementation of Cucumber.

Usage no npm install needed!

<script type="module">
  import cucumberCucumber from 'https://cdn.skypack.dev/@cucumber/cucumber';



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Cucumber is a tool for running automated tests written in plain language. Because they're written in plain language, they can be read by anyone on your team. Because they can be read by anyone, you can use them to help improve communication, collaboration and trust on your team.

Cucumber.js is the JavaScript implementation of Cucumber and runs on the maintained Node.js versions.

Try it now

We've put a demo of Cucumber.js to run in your browser. Why don't you give it a try before anything else?

Help & support


See CONTRIBUTING.md for info on contributing to Cucumber.js.

Code of Conduct

Everyone interacting in this codebase and issue tracker is expected to follow the Cucumber code of conduct.


Cucumber.js is available as an npm module.

7.x.x and above

$ npm install @cucumber/cucumber

If you're upgrading from 6.x.x or below, see the migration guide.

6.x.x and below

$ npm install cucumber@6


The following documentation is for master. See below for documentation for older versions.

Documentation for older versions