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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including cssnano with all npm packages installed. Try it out:

/* * This example targets Node 4 and up. */ const cssnano = require('cssnano'); /* * Add your CSS code here. */ const css = ` h1 { color: #ff0000; font-weight: bold; } `; /* * Add any PostCSS options here. For example to enable sourcemaps, see: * * * Or for an inline sourcemap, uncomment the options below. */ const postcssOpts = { // from: 'app.css', // to: 'app.min.css', // map: {inline: true}, }; /* * Add your choice of preset. Note that for any value other * than 'default', you will need to install the appropriate * preset separately. */ const cssnanoOpts = { preset: 'default', }; /* * Compress the CSS asynchronously and log it to the console. */ cssnano.process(css, postcssOpts, cssnanoOpts).then(result => { console.log(result.css); });

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cssnano v4.1.10

A modular minifier, built on top of the PostCSS ecosystem.


For documentation, please see the following links:

  • Repository:
  • Website:
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