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# markdown-it
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[](https://travis-ci.org/markdown-it/markdown-it)
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[](https://www.npmjs.org/package/markdown-it)
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[](https://coveralls.io/github/markdown-it/markdown-it?branch=master)
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[](https://gitter.im/markdown-it/markdown-it)
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> Markdown parser done right. Fast and easy to extend.
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__[Live demo](https://markdown-it.github.io)__
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- Follows the __[CommonMark spec](http://spec.commonmark.org/)__ + adds syntax extensions & sugar (URL autolinking, typographer).
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- Configurable syntax! You can add new rules and even replace existing ones.
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- High speed.
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- [Safe](https://github.com/markdown-it/markdown-it/tree/master/docs/security.md) by default.
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- Community-written __[plugins](https://www.npmjs.org/browse/keyword/markdown-it-plugin)__ and [other packages](https://www.npmjs.org/browse/keyword/markdown-it) on npm.
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__Table of content__
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- [Install](#install)
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- [Usage examples](#usage-examples)
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- [API](#api)
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- [Syntax extensions](#syntax-extensions)
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- [Benchmark](#benchmark)
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- [Authors](#authors)
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- [References / Thanks](#references--thanks)
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- [License](#license)
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## Install
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**node.js** & **bower**:
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```bash
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npm install markdown-it --save
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bower install markdown-it --save
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```
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**browser (CDN):**
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- [jsDeliver CDN](http://www.jsdelivr.com/#!markdown-it "jsDelivr CDN")
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- [cdnjs.com CDN](https://cdnjs.com/libraries/markdown-it "cdnjs.com")
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## Usage examples
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See also:
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- __[API documentation](https://markdown-it.github.io/markdown-it/)__ - for more
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info and examples.
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- [Development info](https://github.com/markdown-it/markdown-it/tree/master/docs) -
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for plugins writers.
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### Simple
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```js
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// node.js, "classic" way:
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var MarkdownIt = require('markdown-it'),
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md = new MarkdownIt();
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var result = md.render('# markdown-it rulezz!');
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// node.js, the same, but with sugar:
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var md = require('markdown-it')();
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var result = md.render('# markdown-it rulezz!');
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// browser without AMD, added to "window" on script load
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// Note, there is no dash in "markdownit".
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var md = window.markdownit();
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var result = md.render('# markdown-it rulezz!');
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```
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Single line rendering, without paragraph wrap:
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```js
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var md = require('markdown-it')();
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var result = md.renderInline('__markdown-it__ rulezz!');
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```
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### Init with presets and options
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(*) presets define combinations of active rules and options. Can be
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`"commonmark"`, `"zero"` or `"default"` (if skipped). See
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[API docs](https://markdown-it.github.io/markdown-it/#MarkdownIt.new) for more details.
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```js
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// commonmark mode
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var md = require('markdown-it')('commonmark');
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// default mode
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var md = require('markdown-it')();
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// enable everything
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var md = require('markdown-it')({
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html: true,
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linkify: true,
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typographer: true
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});
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// full options list (defaults)
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var md = require('markdown-it')({
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html: false, // Enable HTML tags in source
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xhtmlOut: false, // Use '/' to close single tags (<br />).
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// This is only for full CommonMark compatibility.
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breaks: false, // Convert '\n' in paragraphs into <br>
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langPrefix: 'language-', // CSS language prefix for fenced blocks. Can be
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// useful for external highlighters.
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linkify: false, // Autoconvert URL-like text to links
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// Enable some language-neutral replacement + quotes beautification
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typographer: false,
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// Double + single quotes replacement pairs, when typographer enabled,
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// and smartquotes on. Could be either a String or an Array.
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//
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// For example, you can use '«»„“' for Russian, '„“‚‘' for German,
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// and ['«\xA0', '\xA0»', '‹\xA0', '\xA0›'] for French (including nbsp).
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quotes: '“”‘’',
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// Highlighter function. Should return escaped HTML,
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// or '' if the source string is not changed and should be escaped externaly.
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// If result starts with <pre... internal wrapper is skipped.
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highlight: function (/*str, lang*/) { return ''; }
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});
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```
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### Plugins load
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```js
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var md = require('markdown-it')()
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.use(plugin1)
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.use(plugin2, opts, ...)
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.use(plugin3);
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```
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### Syntax highlighting
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Apply syntax highlighting to fenced code blocks with the `highlight` option:
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```js
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var hljs = require('highlight.js'); // https://highlightjs.org/
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// Actual default values
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var md = require('markdown-it')({
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highlight: function (str, lang) {
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if (lang && hljs.getLanguage(lang)) {
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try {
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return hljs.highlight(lang, str).value;
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} catch (__) {}
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}
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return ''; // use external default escaping
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}
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});
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```
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Or with full wrapper override (if you need assign class to `<pre>`):
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```js
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var hljs = require('highlight.js'); // https://highlightjs.org/
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// Actual default values
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var md = require('markdown-it')({
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highlight: function (str, lang) {
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if (lang && hljs.getLanguage(lang)) {
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try {
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return '<pre class="hljs"><code>' +
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hljs.highlight(lang, str, true).value +
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'</code></pre>';
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} catch (__) {}
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}
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return '<pre class="hljs"><code>' + md.utils.escapeHtml(str) + '</code></pre>';
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}
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});
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```
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### Linkify
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`linkify: true` uses [linkify-it](https://github.com/markdown-it/linkify-it). To
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configure linkify-it, access the linkify instance through `md.linkify`:
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```js
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md.linkify.tlds('.py', false); // disables .py as top level domain
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```
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## API
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__[API documentation](https://markdown-it.github.io/markdown-it/)__
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If you are going to write plugins - take a look at
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[Development info](https://github.com/markdown-it/markdown-it/tree/master/docs).
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## Syntax extensions
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Embedded (enabled by default):
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- [Tables](https://help.github.com/articles/github-flavored-markdown/#tables) (GFM)
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- [Strikethrough](https://help.github.com/articles/github-flavored-markdown/#strikethrough) (GFM)
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Via plugins:
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- [subscript](https://github.com/markdown-it/markdown-it-sub)
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- [superscript](https://github.com/markdown-it/markdown-it-sup)
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- [footnote](https://github.com/markdown-it/markdown-it-footnote)
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- [definition list](https://github.com/markdown-it/markdown-it-deflist)
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- [abbreviation](https://github.com/markdown-it/markdown-it-abbr)
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- [emoji](https://github.com/markdown-it/markdown-it-emoji)
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- [custom container](https://github.com/markdown-it/markdown-it-container)
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- [insert](https://github.com/markdown-it/markdown-it-ins)
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- [mark](https://github.com/markdown-it/markdown-it-mark)
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- ... and [others](https://www.npmjs.org/browse/keyword/markdown-it-plugin)
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### Manage rules
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By default all rules are enabled, but can be restricted by options. On plugin
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load all its rules are enabled automatically.
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```js
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// Activate/deactivate rules, with curring
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var md = require('markdown-it')()
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.disable([ 'link', 'image' ])
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.enable([ 'link' ])
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.enable('image');
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// Enable everything
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md = require('markdown-it')({
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html: true,
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linkify: true,
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typographer: true,
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});
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```
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## Benchmark
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Here is the result of readme parse at MB Pro Retina 2013 (2.4 GHz):
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```bash
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$ benchmark/benchmark.js readme
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Selected samples: (1 of 28)
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> README
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Sample: README.md (7774 bytes)
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> commonmark-reference x 1,222 ops/sec ±0.96% (97 runs sampled)
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> current x 743 ops/sec ±0.84% (97 runs sampled)
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> current-commonmark x 1,568 ops/sec ±0.84% (98 runs sampled)
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> marked-0.3.2 x 1,587 ops/sec ±4.31% (93 runs sampled)
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```
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__Note.__ CommonMark version runs with [simplified link normalizers](https://github.com/markdown-it/markdown-it/blob/master/benchmark/implementations/current-commonmark/index.js)
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for more "honest" compare. Difference is ~ 1.5x.
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As you can see, `markdown-it` doesn't pay with speed for it's flexibility.
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Slowdown of "full" version caused by additional features not available in
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other implementations.
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## Authors
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- Alex Kocharin [github/rlidwka](https://github.com/rlidwka)
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- Vitaly Puzrin [github/puzrin](https://github.com/puzrin)
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_markdown-it_ is the result of the decision of the authors who contributed to
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99% of the _Remarkable_ code to move to a project with the same authorship but
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new leadership (Vitaly and Alex). It's not a fork.
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## References / Thanks
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Big thanks to [John MacFarlane](https://github.com/jgm) for his work on the
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CommonMark spec and reference implementations. His work saved us a lot of time
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during this project's development.
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**Related Links:**
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- https://github.com/jgm/CommonMark - reference CommonMark implementations in C & JS,
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also contains latest spec & online demo.
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- http://talk.commonmark.org - CommonMark forum, good place to collaborate
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developers' efforts.
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**Ports**
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- [motion-markdown-it](https://github.com/digitalmoksha/motion-markdown-it) - Ruby/RubyMotion
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## License
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[MIT](https://github.com/markdown-it/markdown-it/blob/master/LICENSE)
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