Grunt is a JavaScript task runner, a tool used to automatically perform frequent tasks such as minification, compilation, unit testing, and linting. It uses a command-line interface to run custom tasks defined in a file (known as a Gruntfile). Grunt was created by Ben Alman and is written in Node.js. It is distributed via npm. As of October 2022, there were more than 6,000 plugins available in the Grunt ecosystem.
Companies and projects that use Grunt include Adobe Systems, jQuery, Twitter, Mozilla, Bootstrap, Cloudant, Opera, WordPress, Walmart, and Microsoft.