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marky-markdown is a markdown parser, written in NodeJS, that aims for parity with GitHub-style markdown. It is built on top of markdown-it, a CommonMark markdown parser. You can use marky-markdown:

marky-markdown is the thing that parses package READMEs on If you see a markdown parsing bug there, file an issue here!

Node Version Support

marky-markdown strives to support all LTS, current, and maintenance versions of Node.js. When a version of Node.js is EOL, we will EOL support for that version for marky-markdown.

For more information on Node.js LTS and support, click here.

  • marky-markdown < 9.0.0 supports 0.10, 0.12, iojs, 4, 5
  • marky-markdown >= 9.0.0 supports 0.12, 4, 6


npm install marky-markdown --save

Programmatic Usage

marky-markdown exports a single function. For basic use, that function takes a single argument: a string to convert.

var marky = require("marky-markdown")
var html = marky("# hello, I'm markdown")


The exported function takes an optional options object as its second argument:

marky("some trusted string", {sanitize: false})

The default options are as follows:

  sanitize: true,               // remove script tags and stuff 
  linkify: true,                // turn orphan URLs into hyperlinks 
  highlightSyntax: true,        // run highlights on fenced code blocks 
  prefixHeadingIds: true,       // prevent DOM id collisions 
  enableHeadingLinkIcons: true, // render icons inside generated section links 
  serveImagesWithCDN: false,    // use npm's CDN to proxy images over HTTPS 
  debug: false,                 // console.log() all the things 
  package: null                 // npm package metadata 

Command-line Usage

You can use marky-markdown to parse markdown files in the shell. The easiest way to do this is to install globally:

npm i -g marky-markdown
marky-markdown > some.html

In the Browser

This module mostly works in the browser, with the exception of the highlights module.

You can require('marky-markdown') in scripts you browserify yourself, or just use the standalone file in [dist/marky-markdown.js].

Here is an example using HTML5 to render text inside <marky-markdown> tags.

<script src="marky-markdown.js"></script>
<marky-markdown>**Here** _is_ some [Markdown](</marky-markdown>
  for (el of document.getElementsByTagName('marky-markdown')) {
    el.innerHTML = markyMarkdown(el.innerText, {highlightSyntax: false})

Note: Usage with webpack requires that your webpack.config.js configure a loader (such as json-loader) for .json files.


npm install
npm test

What it does

  • Parses markdown with markdown-it, a fast and commonmark-compliant parser.
  • Removes broken and malicious user input with sanitize-html
  • Applies syntax highlighting to GitHub-flavored code blocks using the highlights library from Atom.
  • Converts :emoji:-style shortcuts to unicode emojis.
  • Converts headings (h1, h2, etc) into anchored hyperlinks.
  • Converts relative GitHub links to their absolute equivalents.
  • Converts relative GitHub images sources to their GitHub raw equivalents.
  • Converts insecure Gravatar URLs to HTTPS.
  • Converts list items with leading [ ] and [x] into GitHub-style task lists
  • Wraps embedded YouTube videos so they can be styled.
  • Parses and sanitizes package.description as markdown.
  • Applies CSS classes to redundant content that closely matches npm package name and description.
  • Applies CSS classes to badge images, so we can do something interesting with them one day.

npm packages

Pass in an npm package object to do stuff like rewriting relative URLs to their absolute equivalent on GitHub, normalizing package metadata with redundant readme content, etc

var package = {
  name: "foo",
  description: "foo is a thing",
  repository: {
    type: "git",
    url: ""
  "# hello, I am the foo readme",
  {package: package}


Extra syntax highlighting, in addition to what comes with highlights: