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markdown-it is a powerful Markdown parser and compiler for JavaScript. It allows developers to convert Markdown text into HTML, making it a popular choice for applications that require rich text formatting. With its extensible architecture, markdown-it supports a variety of plugins that can enhance its functionality, such as adding support for tables, footnotes, and custom syntax. Its performance and flexibility make it suitable for both small projects and large applications that need to render Markdown content efficiently.

While markdown-it is a robust option, there are other libraries available that also provide Markdown parsing capabilities. Here are a few alternatives:

  • remark is a Markdown processor powered by plugins. It is part of the unified ecosystem, which allows for a wide range of transformations on Markdown content. remark focuses on the syntax tree, enabling developers to manipulate Markdown in a more programmatic way. This makes it an excellent choice for projects that require extensive customization and processing of Markdown content, such as static site generators or documentation tools. With its plugin architecture, remark can be tailored to fit specific needs, making it highly versatile.

  • showdown is another popular Markdown to HTML converter. It is lightweight and easy to use, making it a great choice for simple applications that need to convert Markdown to HTML without the overhead of additional features. showdown is particularly useful for projects where performance is a priority, as it has a minimal footprint and straightforward API. If you need a quick and efficient way to render Markdown in your application without the need for extensive customization, showdown is an excellent option.

To compare these packages, check out the following link: Comparing markdown-it vs remark vs showdown.

README for markdown-it

markdown-it

CI NPM version Coverage Status Gitter

Markdown parser done right. Fast and easy to extend.

Live demo

  • Follows the CommonMark spec + adds syntax extensions & sugar (URL autolinking, typographer).
  • Configurable syntax! You can add new rules and even replace existing ones.
  • High speed.
  • Safe by default.
  • Community-written plugins and other packages on npm.

Table of content

Install

node.js:

npm install markdown-it

browser (CDN):

Usage examples

See also:

Simple

// node.js
// can use `require('markdown-it')` for CJS
import markdownit from 'markdown-it'
const md = markdownit()
const result = md.render('# markdown-it rulezz!');

// browser with UMD build, added to "window" on script load
// Note, there is no dash in "markdownit".
const md = window.markdownit();
const result = md.render('# markdown-it rulezz!');

Single line rendering, without paragraph wrap:

import markdownit from 'markdown-it'
const md = markdownit()
const result = md.renderInline('__markdown-it__ rulezz!');

Init with presets and options

(*) presets define combinations of active rules and options. Can be "commonmark", "zero" or "default" (if skipped). See API docs for more details.

import markdownit from 'markdown-it'

// commonmark mode
const md = markdownit('commonmark')

// default mode
const md = markdownit()

// enable everything
const md = markdownit({
  html: true,
  linkify: true,
  typographer: true
})

// full options list (defaults)
const md = markdownit({
  // Enable HTML tags in source
  html:         false,

  // Use '/' to close single tags (<br />).
  // This is only for full CommonMark compatibility.
  xhtmlOut:     false,

  // Convert '\n' in paragraphs into <br>
  breaks:       false,

  // CSS language prefix for fenced blocks. Can be
  // useful for external highlighters.
  langPrefix:   'language-',

  // Autoconvert URL-like text to links
  linkify:      false,

  // Enable some language-neutral replacement + quotes beautification
  // For the full list of replacements, see https://github.com/markdown-it/markdown-it/blob/master/lib/rules_core/replacements.mjs
  typographer:  false,

  // Double + single quotes replacement pairs, when typographer enabled,
  // and smartquotes on. Could be either a String or an Array.
  //
  // For example, you can use '«»„“' for Russian, '„“‚‘' for German,
  // and ['«\xA0', '\xA0»', '‹\xA0', '\xA0›'] for French (including nbsp).
  quotes: '“”‘’',

  // Highlighter function. Should return escaped HTML,
  // or '' if the source string is not changed and should be escaped externally.
  // If result starts with <pre... internal wrapper is skipped.
  highlight: function (/*str, lang*/) { return ''; }
});

Plugins load

import markdownit from 'markdown-it'

const md = markdownit
  .use(plugin1)
  .use(plugin2, opts, ...)
  .use(plugin3);

Syntax highlighting

Apply syntax highlighting to fenced code blocks with the highlight option:

import markdownit from 'markdown-it'
import hljs from 'highlight.js' // https://highlightjs.org

// Actual default values
const md = markdownit({
  highlight: function (str, lang) {
    if (lang && hljs.getLanguage(lang)) {
      try {
        return hljs.highlight(str, { language: lang }).value;
      } catch (__) {}
    }

    return ''; // use external default escaping
  }
});

Or with full wrapper override (if you need assign class to <pre> or <code>):

import markdownit from 'markdown-it'
import hljs from 'highlight.js' // https://highlightjs.org

// Actual default values
const md = markdownit({
  highlight: function (str, lang) {
    if (lang && hljs.getLanguage(lang)) {
      try {
        return '<pre><code class="hljs">' +
               hljs.highlight(str, { language: lang, ignoreIllegals: true }).value +
               '</code></pre>';
      } catch (__) {}
    }

    return '<pre><code class="hljs">' + md.utils.escapeHtml(str) + '</code></pre>';
  }
});

Linkify

linkify: true uses linkify-it. To configure linkify-it, access the linkify instance through md.linkify:

md.linkify.set({ fuzzyEmail: false });  // disables converting email to link

API

API documentation

If you are going to write plugins, please take a look at Development info.

Syntax extensions

Embedded (enabled by default):

Via plugins:

Manage rules

By default all rules are enabled, but can be restricted by options. On plugin load all its rules are enabled automatically.

import markdownit from 'markdown-it'

// Activate/deactivate rules, with currying
const md = markdownit()
  .disable(['link', 'image'])
  .enable(['link'])
  .enable('image');

// Enable everything
const md = markdownit({
  html: true,
  linkify: true,
  typographer: true,
});

You can find all rules in sources:

Benchmark

Here is the result of readme parse at MB Pro Retina 2013 (2.4 GHz):

npm run benchmark-deps
benchmark/benchmark.mjs readme

Selected samples: (1 of 28)
 > README

Sample: README.md (7774 bytes)
 > commonmark-reference x 1,222 ops/sec ±0.96% (97 runs sampled)
 > current x 743 ops/sec ±0.84% (97 runs sampled)
 > current-commonmark x 1,568 ops/sec ±0.84% (98 runs sampled)
 > marked x 1,587 ops/sec ±4.31% (93 runs sampled)

Note. CommonMark version runs with simplified link normalizers for more "honest" compare. Difference is ≈1.5×.

As you can see, markdown-it doesn't pay with speed for its flexibility. Slowdown of "full" version caused by additional features not available in other implementations.

markdown-it for enterprise

Available as part of the Tidelift Subscription.

The maintainers of markdown-it and thousands of other packages are working with Tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications. Save time, reduce risk, and improve code health, while paying the maintainers of the exact dependencies you use. Learn more.

Authors

markdown-it is the result of the decision of the authors who contributed to 99% of the Remarkable code to move to a project with the same authorship but new leadership (Vitaly and Alex). It's not a fork.

References / Thanks

Big thanks to John MacFarlane for his work on the CommonMark spec and reference implementations. His work saved us a lot of time during this project's development.

Related Links:

  • https://github.com/jgm/CommonMark - reference CommonMark implementations in C & JS, also contains latest spec & online demo.
  • http://talk.commonmark.org - CommonMark forum, good place to collaborate developers' efforts.

Ports

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