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    2.5.0 • Public • Published


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    An extremely simple, pluggable static site generator.

    In Metalsmith, all of the logic is handled by plugins. You simply chain them together.

    Here's what the simplest blog looks like:

    const Metalsmith = require('metalsmith')
    const layouts = require('@metalsmith/layouts')
    const markdown = require('@metalsmith/markdown')
      .build(function (err) {
        if (err) throw err
        console.log('Build finished!')



    npm install metalsmith


    yarn add metalsmith


    What if you want to get fancier by hiding unfinished drafts, grouping posts in collections, and using custom permalinks? Just add plugins...

    const Metalsmith = require('metalsmith')
    const collections = require('@metalsmith/collections')
    const layouts = require('@metalsmith/layouts')
    const markdown = require('@metalsmith/markdown')
    const permalinks = require('@metalsmith/permalinks')
        excerpt: true
        NAME: process.env.NODE_ENV,
        DEBUG: '@metalsmith/*',
        DEBUG_LOG: 'metalsmith.log'
        sitename: 'My Static Site & Blog',
        siteurl: '',
        description: "It's about saying »Hello« to the world.",
        generatorname: 'Metalsmith',
        generatorurl: ''
          posts: 'posts/*.md'
          relative: false
      .build(function (err) {
        if (err) throw err

    How does it work?

    Metalsmith works in three simple steps:

    1. Read all the files in a source directory.
    2. Invoke a series of plugins that manipulate the files.
    3. Write the results to a destination directory!

    Each plugin is invoked with the contents of the source directory, and each file can contain YAML front-matter that will be attached as metadata, so a simple file like...

    title: A Catchy Title
    date: 2021-12-01
    An informative article.

    ...would be parsed into...

      'path/to/': {
        title: 'A Catchy Title',
        date: <Date >,
        contents: <Buffer 7a 66 7a 67...>,
        stats: {

    ...which any of the plugins can then manipulate however they want. Writing plugins is incredibly simple, just take a look at the example drafts plugin.

    Of course they can get a lot more complicated too. That's what makes Metalsmith powerful; the plugins can do anything you want!


    A Metalsmith plugin is a function that is passed the file list, the metalsmith instance, and a done callback. It is often wrapped in a plugin initializer that accepts configuration options.

    Check out the official plugin registry at:
    Find all the core plugins at:
    See the draft plugin for a simple plugin example.


    Check out the full API reference at:


    In addition to a simple Javascript API, the Metalsmith CLI can read configuration from a metalsmith.json file, so that you can build static-site generators similar to Jekyll or Hexo easily. The example blog above would be configured like this:


      "source": "src",
      "destination": "build",
      "clean": true,
      "metadata": {
        "sitename": "My Static Site & Blog",
        "siteurl": "",
        "description": "It's about saying »Hello« to the world.",
        "generatorname": "Metalsmith",
        "generatorurl": ""
      "plugins": [
        { "@metalsmith/drafts": true },
        { "@metalsmith/collections": { "posts": "posts/*.md" } },
        { "@metalsmith/markdown": true },
        { "@metalsmith/permalinks": "posts/:title" },
        { "@metalsmith/layouts": true }

    Then run:

    # Metalsmith · reading configuration from: /path/to/metalsmith.json
    # Metalsmith · successfully built to: /path/to/build

    Options recognised by metalsmith.json are source, destination, concurrency, metadata, clean and frontmatter. Checkout the static site, Jekyll examples to see the CLI in action.

    Local plugins

    If you want to use a custom plugin, but feel like it's too domain-specific to be published to the world, you can include plugins as local npm modules: (simply use a relative path from your root directory)

      "plugins": [{ "./lib/metalsmith/plugin.js": true }]

    The secret...

    We often refer to Metalsmith as a "static site generator", but it's a lot more than that. Since everything is a plugin, the core library is just an abstraction for manipulating a directory of files.

    Which means you could just as easily use it to make...



    Use debug to debug your build with export DEBUG=metalsmith-*,@metalsmith/* (Linux) or set DEBUG=metalsmith-*,@metalsmith/* for Windows.
    Use the excellent metalsmith-debug-ui plugin to get a snapshot UI for every build step.

    Node Version Requirements

    Metalsmith 2.5.x supports NodeJS versions 12 and higher.
    Metalsmith 2.4.x supports NodeJS versions 8 and higher.
    Metalsmith 2.3.0 and below support NodeJS versions all the way back to 0.12.


    Special thanks to Ian Storm Taylor, Andrew Meyer, Dominic Barnes, Andrew Goodricke, Ismay Wolff, Kevin Van Lierde and others for their contributions!



    npm i metalsmith@2.5.0





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