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    Simple static-file build system for jade, stylus, and JavaScript.

    • Express plugin for easily rendering built-or-debug HTML, CSS, and JS.
    • Command-line mason executable for easily building projects.
    • JavaScript API for building from within your own code.


    You have a dozen site-wide platform dependencies that you want to package in platform.js. You have per-page JS assets that you want to package in page-name.js files. During development, you need all of these assets to be included as separate, uncompiled files with line numbers. During production, you need to flip a switch to minify all these files and include them in the right places. You want to easily generate static html and css from jade and stylus.

    Install mason

      $ npm install -g mason

    or use package.json's devDependencies:


    Build static files

    use the settings in mason.json:

      $ mason build

    or using devDependencies:

      $ node_modules/.bin/mason build

    Watch your files

      $ mason watch

    (mason is smart about recompiling - it performs the minimum possible build for each file change)

      $ mason watch -j debug

    Render a mason asset within a view

    !!! 5
        != mason('platform.js')

    By default, mason build injects compressed (uglified) script tags via the != mason() local.

    To inject individual scripts for debugging, use:

      $ mason build -j debug


    base: Tells where to put your compiled files

    src: Used by mason.locals() to render URLs (eg, /compiled/platform.js instead of /work/project/public/compiled/platform.js)

    renderer: Specify the default renderer for this asset

    javascript:" Specify the default renderer for this type of asset

      "views": {
        "type": "jade",
        "sourceRoot": "views",
        "sourcePaths": ["test.jade"],
        "destRoot": "public",
        "destPath": "test.html"
      "platform.js": {
        "type": "javascript",
        "sourceRoot": "public",
        "sourcePaths": [
        "destRoot": "public",
        "destPath": "compiled/platform.js"
      "page.js": {
        "type": "javascript",
        "sourceRoot": "public",
        "sourcePaths": [
        "destRoot": "public",
        "destPath": "compiled/page.js"
      "global.css": {
        "type": "stylus",
        "sourceRoot": "styles",
        "sourcePaths": [ "global.styl" ],
        "destRoot": "public",
        "destPath": "compiled/global.css"

    JavaScript API

    Build static files

      var mason = require('mason');, {
        'page.js': 'uglify'

    (mason.json resides in __dirname)

    Use mason in an express app

      var app = express();

    By default, mason.locals will inject a compressed (uglified) script into your view.

    To control how specific assets are injected, use:

      var app = express(),
          config = {
            'platform.js': 'uglify',
            'page.js': 'debug'
      app.locals(mason.locals(__dirname, config));


    npm i mason

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