Static site generator for Grunt.js, Yeoman and Node.js. Used by Zurb Foundation, Zurb Ink, H5BP/Effeckt, Less.js /, Topcoat, Web Experience Toolkit, and hundreds of other projects to build sites, themes, components, documentation, blogs and gh

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Static site generator for Grunt.js, Yeoman and Node.js. Used by Zurb Foundation, Zurb Ink, H5BP/Effeckt, Less.js /, Topcoat, Web Experience Toolkit, and hundreds of other projects to build sites, themes, components, documentation, blogs and gh-pages.

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Versions of grunt-assemble below 0.2.0 have been deprecated and can be found on the 0.1.15-deprecated branch.
Versions of grunt-assemble at and above 0.2.0 contain the code from the original assemble up to version 0.4.42.
See the migration section for instructions on what to do when upgrading to a new version.

Why use Assemble?

  1. Most popular site generator for Grunt.js and Yeoman. Assemble is used to build hundreds of web projects, ranging in size from a single page to 14,000 pages (that we're aware of!). Let us know if you use Assemble.
  2. Allows you to carve your HTML up into reusable fragments: partials, includes, sections, snippets... Whatever you prefer to call them, Assemble does that.
  3. Optionally use layouts to wrap your pages with commonly used elements and content.
  4. "Pages" can either be defined as HTML/templates, JSON or YAML, or directly inside the Gruntfile.
  5. It's awesome. Lol just kidding. But seriously, Assemble... is... awesome! and it's fun to use.

...and of course, we use Assemble to build the project's own documentation
For more: hear Jon Schlinkert and Brian Woodward discuss Assemble on Episode 98 of the Javascript Jabber Podcast.

The "assemble" task

Getting Started

Assemble requires Grunt ~0.4.1
If you haven't used grunt
before, be sure to check out the Getting Started guide.
From the same directory as your project's Gruntfile
Getting Started and package.json, install Assemble with the following command:
npm install grunt-assemble --save-dev

Once that's done, add this line to your project's Gruntfile:

The "assemble" task

Run the "assemble" task with the grunt assemble command.
Task targets, files and options may be specified according to the grunt Configuring tasks guide.
In your project's Gruntfile, add a section named assemble to the data object passed into grunt.initConfig().
assemble: {
  options: {
    assets: 'assets',
    plugins: ['permalinks'],
    partials: ['includes/**/*.hbs'],
    layout: ['layouts/default.hbs'],
    data: ['data/*.{json,yml}']
  site: {
    src: ['docs/*.hbs'],
    dest: './'


See the documentation for Options for more information.


Type: String Default: undefined
Used with the {{assets}} variable to resolve the relative path from the dest file to the assets folder.


Type: String|Array|Object Default: src/data
Specify the data to supply to your templates. Data may be formatted in JSON, YAML, YAML front matter, or passed directly as an object. Wildcard patterns may also be used.
The filenames of the selected files must not collide with the configuration options key names for the assemble build task. For example, the files must not be called assets.yml,collections.json,….


Type: String Default: undefined
The directory to use as the "cwd" for layouts. When this option is defined, layouts may be defined using only the name of the layout.


Type: String|Array<String> Default: undefined
A glob pattern to be used to find layouts. When this option is defined, the layoutdir option is ignored and layouts specified in templates will be searched for using the specified glob pattern(s).


Type: String Default: undefined
If set, this defines the layout file to use for the task or targettasks-and-targets. However, when specifying a layout, unlike Jekyll, Assemble requires a file extension since you are not limited to using a single file type.


Type: String Default: undefined
Specify the extension to use for layouts, enabling layouts in YAML front matter to be defined without an extension:


layout: default

### [partials](
Type:  `String|Array`
Default: `undefined`

Specifies the Handlebars partials files, or paths to the directories of files to be used.

### [plugins](
Type: `String|Array`
Default: `undefined`

Name of the npm module to use and/or the path(s) to any custom plugins to use. Wildcard patterns may also be used.

See the [docs for plugins](

### [helpers](
Type: `String|Array`
Default: [handlebars-helpers](

Name of the npm module to use and/or the path(s) to any custom helpers to use with the current template engine. Wildcard patterns may also be used.

By default, Assemble includes [handlebars-helpers](( as a dependency, so any helpers from that library are already available to be used in your templates.

See the [docs for helpers](

### [ext](
Type: `String`
Default: `.html`

Specify the file extension for destination files. Example:

### [marked](
Type: `Object`
Default: [Marked.js defaults](

Specify the [Marked.js options]( for the `{{#markdown}}{{/markdown}}` and `{{md ""}}` helpers to use when converting content.

### [engine](
Type: `String`
Default: `Handlebars`

Specify the engine to use for compiling templates **if you are not using Handlebars**.

Also see [assemble-swig]( for compiling [Swig Templates](

### flatten
Type: `Boolean`
Default: `false`

Remove anything after (and including) the first `.` in the destination path, then append this value. In other words, when files are generated from different source folders this "flattens" them into the same destination directory. See [building the files object dynamically]( for more information on `files` formats.

Visit [Assemble's documentation]( for more information about options.

### Usage Examples
Simple example of using data files in both `.json` and `.yml` format to build Handlebars templates.

assemble: {
  options: {
    data: 'src/data/**/*.{json,yml}'
  docs: {
    files: {
      'dist/': ['src/templates/**/*.hbs']

Using multiple targets

assemble: {
  options: {
    assets: 'assets',
    layoutdir: 'docs/layouts'
    partials: ['docs/includes/**/*.hbs'],
    data: ['docs/data/**/*.{json,yml}']
  site: {
    options: {
      layout: 'default.hbs'
    src: ['templates/site/*.hbs'],
    dest: './'
  blog: {
    options: {
      layout: 'blog-layout.hbs'
    src: ['templates/blog/*.hbs'],
    dest: 'articles/'
  docs: {
    options: {
      layout: 'docs-layout.hbs'
    src: ['templates/docs/*.hbs'],
    dest: 'docs/'

Visit Assemble's documentation for many more examples and pointers on getting started.


Breaking changes between versions 0.5.0 and 0.6.0

Version 6 is using assemble-handlebars version 0.4.0 which updates handlebars-helpers to version 0.6.0. Due to this update, there are some breaking changes with how some helpers are loaded and some missing/added helpers.
The following list contains the breaking changes that we have noticed that may require updates to existing templates.
helpers loaded from package.json
Any helpers declared in dependencies or devDependencies and have their name in the keywords property will no longer be loaded automatically. To load the helpers, just include the package name in the helpers option for your grunt-assemble target:
assemble: {
  options: {
    helpers: ['handlebars-helper-eachitems']

new path helpers
Helpers have been added that map to methods on the built-in path module. Some of these helpers are also properties that grunt-assemble adds automatically to page properties. To use the page property, use the this keyword before the property name. To use the helper, use it like any other helper.
{{basename this.path}}

missing helper "inspect"
The "inspect" helper has been removed from handlebars-helpers. The test fixtures in this project use the "inspect" helper so it has been recreated here.
missing helper "unlesseq"
The "unlesseq" helper has been renamed to "unlessEq".
missing helper "md" or "markdown"
There is a bug in handlebars-helpers@0.6 that causes the md and markdown helpers to not be registered correctly. This has been fixed in newer versions of handlebars-helpers, however those changes have not made it here yet. There is currently a refactor of grunt-assemble that will include the fix, but for now, use the following work-around:
Create a file and register the helpers manually:
// helpers/markdown.js
module.exports.register = function (Handlebars) {
  'use strict';

  Handlebars.registerHelper('markdown', require('helper-markdown')());
  Handlebars.registerHelper('md', require('helper-md').sync);

// Gruntfile.js
assemble: {
  options: {
    helpers: ['./helpers/*.js']

handlebars 4 changed how context depths are handled
assemble-handlebars is also using a newer version of handlebars that changed how the context depth is handled. Some of the block helpers that would create a new depth, no longer create the depth. This requires changing some templates that use the {{../}} syntax to reduce the amount of ../ segments used. This can be seen in block helpers that don't modify the context, like {{#if}}{{/if}} and {{#is}}{{/is}}.


In lieu of a formal styleguide, take care to maintain the existing coding style. Add unit tests for any new or changed functionality, and please re-build the documentation with grunt-verb
before submitting a pull request.

Assemble plugins

Here are some related projects you might be interested in from the Assemble core team.

Visit for more information about Assemble middleware.


Jon Schlinkert Brian Woodward

Release History

  • 2014-07-07 v0.4.41 Updating resolve-dep dependency.
    2014-06-13 v0.4.38 Use gray-matter instead of assemble-yaml.,Updates dependencies. Minor
refactoring and new utils to get rid of a couple of dependencies.,Update   
the loaders for plugins and helpers to use resolve-dep. Should be more     
reliable now.                                                              
  • 2013-10-25 v0.4.17 Adds a params object to the call to helper.register allowing grunt and
assemble to be passed in and used from inside helpers.                     
  • 2013-10-24 v0.4.16 Adds support for using wildcards with plugins stages.
    2013-10-24 v0.4.15 Implements multiple plugin stages.
    2013-10-21 v0.4.14 Adds support for plugins running once, before and after (thanks
@adjohnson916).,Adds pagination!,Thanks to @xzyfer, `` can now 
also directly accept an object of data.                                    
  • 2013-10-12 v0.4.13 Adds originalAssets property to root context to store the pre-calculated
assets path                                                                
  • 2013-10-05 v0.4.12 Fixes plugins resolving for devDependencies.
    2013-10-03 v0.4.11 Adds filePair to page object. thanks @adjohnson916!
    2013-10-02 v0.4.10 Adds plugin support to Assemble using the plugins option. thanks
  • 2013-10-02 v0.4.9 Adds layoutext and postprocess options.
    2013-09-30 v0.4.8 Assemble now builds 30-50% faster due to some refactoring to async and how
context is calculated.                                                     
  • 2013-09-20 v0.4.7 Adds grunt-readme to make it easier to keep the readme updated using
templates.,Keep options.partials intact so they can be used in helpers.    
  • 2013-09-15 v0.4.6 Updating how the assets path is calculated.,Adding resolve-dep and ability
to load helpers from node modules using minimatch patterns                 
  • 2013-09-03 v0.4.5 Bug fix: allow page content containing $.,Add alias metadata for data on
pages configuration object.                                                
  • 2013-08-01 v0.4.4 Adds "nested layouts",Adds option for pages in JSON/YAML collections to be
defined as either objects or keys in an array.                             
  • 2013-08-01 v0.4.3 Adds "options.pages" for passing in an array of pages in JSON or YAML
  • 2013-06-20 v0.4.0 Adds "layoutdir" option for defining the directory to be used for layouts.
If layoutdir is defined, then layouts may be defined using only the name of
the layout.                                                                
  • 2013-06-10 v0.3.81 Adds additional ways to load custom helpers. Now it's possible to use a
glob pattern that points to a list of scripts with helpers to load.,Adds   
examples and tests on how to use the new custom helper loading methods.    
  • 2013-06-01 v0.3.80 Fixing bug with null value in engine
    2013-05-07 v0.3.77 Updated README with info about assemble methods
    2013-04-28 v0.3.74 Updating the assemble library to use the assemble-utils repo and
unnecessary code.                                                          
  • 2013-04-21 v0.3.73 Fixing how the relative path helper worked and showing an example in the
footer of the layout. This example is hidden, but can be seen by doing view
  • 2013-04-20 v0.3.72 Fixing the layout override issue happening in the page yaml headers.
Something was missed during refactoring.                                   
  • 2013-04-19 v0.3.9 Adds tags and categories to the root context and ensure that the current
page context values don't override the root context values.                
  • 2013-04-18 v0.3.8 Updating to use actual assets property from current page.
    2013-04-17 v0.3.7 Cleaning up some unused folders and tests
    2013-04-16 v0.3.6 Fixed missing assets property.
    2013-04-16 v0.3.5 Adds a sections array to the template engine so it can be used in helpers.
  • 2013-04-11 v0.3.4 More tests for helpers and global variables, organized tests. A number of
bug fixes.                                                                 
  • 2013-04-06 v0.3.3 helper-lib properly externalized and wired up. Global variables for
filename, ext and pages                                                    
  • 2013-03-22 v0.3.22 Merged global and target level options so data and partial files can be
  • 2013-03-22 v0.3.21 Valid YAML now allowed in object (along with JSON)
    2013-03-18 v0.3.14 new relative helper for resolving relative paths


Copyright (c) 2017 Jon Schlinkert, Brian Woodward, contributors.
Released under the MIT license

This file was generated by grunt-verb
on March 17, 2017.