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https://github.com/markdown-it/markdown-it

Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed
https://github.com/markdown-it/markdown-it

commonmark javascript markdown

Last synced: 11 days ago
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Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed

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README 

        
# markdown-it 



[![CI](https://github.com/markdown-it/markdown-it/actions/workflows/ci.yml/badge.svg)](https://github.com/markdown-it/markdown-it/actions/workflows/ci.yml)

[![NPM version](https://img.shields.io/npm/v/markdown-it.svg?style=flat)](https://www.npmjs.org/package/markdown-it)

[![Coverage Status](https://coveralls.io/repos/markdown-it/markdown-it/badge.svg?branch=master&service=github)](https://coveralls.io/github/markdown-it/markdown-it?branch=master)

[![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/markdown-it/markdown-it)



> Markdown parser done right. Fast and easy to extend.



__[Live demo](https://markdown-it.github.io)__



- Follows the __[CommonMark spec](http://spec.commonmark.org/)__ + adds syntax extensions & sugar (URL autolinking, typographer).

- Configurable syntax! You can add new rules and even replace existing ones.

- High speed.

- [Safe](https://github.com/markdown-it/markdown-it/tree/master/docs/security.md) by default.

- 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.



__Table of content__



- [Install](#install)

- [Usage examples](#usage-examples)

  - [Simple](#simple)

  - [Init with presets and options](#init-with-presets-and-options)

  - [Plugins load](#plugins-load)

  - [Syntax highlighting](#syntax-highlighting)

  - [Linkify](#linkify)

- [API](#api)

- [Syntax extensions](#syntax-extensions)

  - [Manage rules](#manage-rules)

- [Benchmark](#benchmark)

- [markdown-it for enterprise](#markdown-it-for-enterprise)

- [Authors](#authors)

- [References / Thanks](#references--thanks)



## Install



**node.js**:



```bash

npm install markdown-it

```



**browser (CDN):**



- [jsDeliver CDN](http://www.jsdelivr.com/#!markdown-it "jsDelivr CDN")

- [cdnjs.com CDN](https://cdnjs.com/libraries/markdown-it "cdnjs.com")



## Usage examples



See also:



- __[API documentation](https://markdown-it.github.io/markdown-it/)__ - for more

  info and examples.

- [Development info](https://github.com/markdown-it/markdown-it/tree/master/docs) -

  for plugins writers.



### Simple



```js

// 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:



```js

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](https://markdown-it.github.io/markdown-it/#MarkdownIt.new) for more details.



```js

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 (
).

  // This is only for full CommonMark compatibility.

  xhtmlOut:     false,



  // Convert '\n' in paragraphs into 


  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 ` or ``):



```js

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, ignoreIllegals: true }).value +

               '
';

      } catch (__) {}

    }



    return '
' + md.utils.escapeHtml(str) + '
';

  }

});

```



### Linkify



`linkify: true` uses [linkify-it](https://github.com/markdown-it/linkify-it). To

configure linkify-it, access the linkify instance through `md.linkify`:



```js

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

```



## API



__[API documentation](https://markdown-it.github.io/markdown-it/)__



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

[Development info](https://github.com/markdown-it/markdown-it/tree/master/docs).



## Syntax extensions



Embedded (enabled by default):



- [Tables](https://help.github.com/articles/organizing-information-with-tables/) (GFM)

- [Strikethrough](https://help.github.com/articles/basic-writing-and-formatting-syntax/#styling-text) (GFM)



Via plugins:



- [subscript](https://github.com/markdown-it/markdown-it-sub)

- [superscript](https://github.com/markdown-it/markdown-it-sup)

- [footnote](https://github.com/markdown-it/markdown-it-footnote)

- [definition list](https://github.com/markdown-it/markdown-it-deflist)

- [abbreviation](https://github.com/markdown-it/markdown-it-abbr)

- [emoji](https://github.com/markdown-it/markdown-it-emoji)

- [custom container](https://github.com/markdown-it/markdown-it-container)

- [insert](https://github.com/markdown-it/markdown-it-ins)

- [mark](https://github.com/markdown-it/markdown-it-mark)

- ... and [others](https://www.npmjs.org/browse/keyword/markdown-it-plugin)



### Manage rules



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

load all its rules are enabled automatically.



```js

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:



- [`parser_core.mjs`](lib/parser_core.mjs)

- [`parser_block.mjs`](lib/parser_block.mjs)

- [`parser_inline.mjs`](lib/parser_inline.mjs)



## Benchmark



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



```bash

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](https://github.com/markdown-it/markdown-it/blob/master/benchmark/implementations/current-commonmark/index.mjs)

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.](https://tidelift.com/subscription/pkg/npm-markdown-it?utm_source=npm-markdown-it&utm_medium=referral&utm_campaign=enterprise&utm_term=repo)



## Authors



- Alex Kocharin [github/rlidwka](https://github.com/rlidwka)

- Vitaly Puzrin [github/puzrin](https://github.com/puzrin)



_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](https://github.com/jgm) 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**



- [motion-markdown-it](https://github.com/digitalmoksha/motion-markdown-it) - Ruby/RubyMotion

- [markdown-it-py](https://github.com/ExecutableBookProject/markdown-it-py)- Python