Grunt Grunt is a front end task automater on steroids; you just setup a Gruntfile, and watch it purrr. We’ve been using it to automate all kinds of boring tasks; CSS and JavaScript concentration, minification, image optimization, file watchers, and even running servers. Basically all the crap you want to setup once and never think about again.

Grunt has a really well designed and modular codebase. By itself, the core library is just a lonely task runner, but thanks to the good developer community who work tirelessly to maintain it’s awesome plugins, Grunt is a total beast. For me it’s become one of those simple yet indispensable every day tools that I’d be lost without.

Grunt is built on top of node.js, which we play around with quite a bit because it’s underlying C library, libuv, also powers our very own LibSourcey.

I recently added Grunt to Mesh and Symple, so read on to find out how you can do the same.

Setup Your Project

Lets say you have a basic project layout like so:

|-- src
  |-- *.css
  |-- *.js
|-- dist

First things first, install Grunt:

npm install grunt-cli

Create a package.json file in your root folder using this file as a template:

    "name" : "my-project",
    "version" : "0.0.1",
    "devDependencies": {    
        "grunt": "~0.4.2",
        "grunt-contrib-concat": "~0.1.3",
        "grunt-contrib-cssmin" : "~0.6.1",
        "grunt-contrib-watch" : "~0.5.3",
        "grunt-contrib-uglify" : "~0.2.0"

Now create a Gruntfile.js in your root folder and insert the following:

module.exports = function (grunt) {
        pkg: grunt.file.readJSON('package.json'),
        concat: {
            css: {
                src: [
                dest: 'dist/my-project.css'
            js: {
                src: [
                dest: 'dist/my-project.js'
        cssmin: {
            css: {
                src: 'dist/my-project.css',
                dest: 'dist/my-project.min.css'
        uglify: {
            js: {
                files: {
                    'dist/my-project.min.js': ['dist/mesh.js']
        watch: {
          files: ['src/*'],
          tasks: ['concat', 'cssmin', 'uglify']
    grunt.registerTask('default', ['concat:css', 'cssmin:css', 'concat:js', 'uglify:js']);

This simple Gruntfile tells Grunt to combine and minify the CSS and JS files from the src folder, and save the result to the dist folder.

Remember that the Gruntfile is just JavaScript, so you can add your own methods as you see fit.

To execute all default tasks just run the following command from the source directory (who would’ve guessed it):


For a list of help commands on running specific tasks and more run the following command:

grunt --help

Filesystem Watcher

Notice that we also included the grunt-contrib-watch plugin, which tells Grunt to watch the filesystem in real-time for changes to your source files, and updates the distribution files automatically. Nice!

In order to start the watcher run the following command:

grunt watch

Didn’t I say it was easy? Now go forth and create :)