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https://github.com/jonschlinkert/remarkable

Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one. Gulp and metalsmith plugins available. Used by Facebook, Docusaurus and many others! Use https://github.com/breakdance/breakdance for HTML-to-markdown conversion. Use https://github.com/jonschlinkert/markdown-toc to generate a table of contents.
https://github.com/jonschlinkert/remarkable

commonmark compile docusaurus gfm javascript jonschlinkert markdown markdown-it markdown-parser md node nodejs parse parser syntax-highlighting

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Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one. Gulp and metalsmith plugins available. Used by Facebook, Docusaurus and many others! Use https://github.com/breakdance/breakdance for HTML-to-markdown conversion. Use https://github.com/jonschlinkert/markdown-toc to generate a table of contents.

Awesome Lists containing this project

README 

        
# remarkable



[![Build Status](https://travis-ci.org/jonschlinkert/remarkable.svg?branch=master)](https://travis-ci.org/jonschlinkert/remarkable)

[![NPM version](https://img.shields.io/npm/v/remarkable.svg)](https://www.npmjs.org/package/remarkable)

[![jsDelivr Hits](https://data.jsdelivr.com/v1/package/npm/remarkable/badge?style=rounded)](https://www.jsdelivr.com/package/npm/remarkable)

[![Coverage Status](https://img.shields.io/coveralls/jonschlinkert/remarkable.svg)](https://coveralls.io/r/jonschlinkert/remarkable?branch=dev)



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



__[Live demo](http://jonschlinkert.github.io/remarkable/demo/)__



- Supports the [CommonMark](http://commonmark.org/) spec +

  [syntax extensions](#syntax-extensions) + sugar (URL autolinking, typographer).

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

- [High speed](#benchmark)!

- [Community plugins](https://www.npmjs.org/browse/keyword/remarkable) on npm.







## Install



**node.js:**



```bash

npm install remarkable --save

```



**browser (CDN):**



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

- [cdnjs](https://cdnjs.com/libraries/remarkable "cdnjs")



## Usage



```js

import { Remarkable } from 'remarkable';

var md = new Remarkable();



console.log(md.render('# Remarkable rulezz!'));

// => 
Remarkable rulezz!


```



or with commonjs



```js

const { Remarkable } = require('remarkable');

var md = new Remarkable();



console.log(md.render('# Remarkable rulezz!'));

// => 
Remarkable rulezz!


```



If installed globally with `npm`:



```sh

cat myfile.md | remarkable

remarkable --file myfile.md



# get options

remarkable -h

```



## Documentation



See the [docs](docs/) directory for documentation on the following topics:



- [parser](docs/parser.md)

- [parsing_block](docs/parsing_block.md)

- [parsing_core](docs/parsing_core.md)

- [parsing_inline](docs/parsing_inline.md)

- [plugins](docs/plugins.md)

- [renderer](docs/renderer.md)



### Options



By default, remarkable is configured to be similar to GFM, but with HTML disabled.

This is easy to change if you prefer different settings.



There are two ways to define options.



#### constructor



Define options in the constructor:



```js

// Actual default values

var md = new Remarkable({

  html:         false,        // Enable HTML tags in source

  xhtmlOut:     false,        // Use '/' to close single tags (
)

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


  langPrefix:   'language-',  // CSS language prefix for fenced blocks



  // Enable some language-neutral replacement + quotes beautification

  typographer:  false,



  // Double + single quotes replacement pairs, when typographer enabled,

  // and smartquotes on. Set doubles to '«»' for Russian, '„“' for German.

  quotes: '“”‘’',



  // Highlighter function. Should return escaped HTML,

  // or '' if the source string is not changed

  highlight: function (/*str, lang*/) { return ''; }

});



console.log(md.render('# Remarkable rulezz!'));

// => 
Remarkable rulezz!


```



#### .set



Or define options via the `.set()` method:



```js

import { Remarkable } from 'remarkable';



var md = new Remarkable();



md.set({

  html: true,

  breaks: true

});

```



**Note:** To achieve the best possible performance, don't modify a `Remarkable`

instance on the fly. If you need multiple configurations, create

multiple instances and initialize each with a configuration that is ideal for

that instance.



### Presets



Remarkable offers some "presets" as a convenience to quickly enable/disable

active syntax rules and options for common use cases.



#### commonmark



Enable strict [CommonMark](http://commonmark.org/) mode with the `commonmark` preset:



```js

import { Remarkable } from 'remarkable';

var md = new Remarkable('commonmark');

```



#### full



Enable all available rules (but still with default options, if not set):



```js

import { Remarkable } from 'remarkable';

var md = new Remarkable('full');



// Or with options:

var md = new Remarkable('full', {

  html: true,

  typographer: true

});

```



### Syntax highlighting



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



```js

import { Remarkable } from 'remarkable';

import hljs from 'highlight.js' // https://highlightjs.org/



// Actual default values

var md = new Remarkable({

  highlight: function (str, lang) {

    if (lang && hljs.getLanguage(lang)) {

      try {

        return hljs.highlight(lang, str).value;

      } catch (err) {}

    }



    try {

      return hljs.highlightAuto(str).value;

    } catch (err) {}



    return ''; // use external default escaping

  }

});

```



### Syntax extensions



Enabled by default:



- [Footnotes](http://johnmacfarlane.net/pandoc/README.html#footnotes)

- [Tables](https://help.github.com/articles/github-flavored-markdown/#tables) (GFM)

- [\](https://help.github.com/articles/github-flavored-markdown/#strikethrough)

  (GFM strikethrough) - `~~deleted text~~`



Disabled by default:



- [\](http://johnmacfarlane.net/pandoc/README.html#superscripts-and-subscripts) - `19^th^`

- [\](http://johnmacfarlane.net/pandoc/README.html#superscripts-and-subscripts) - `H~2~O`

- [abbreviations](https://michelf.ca/projects/php-markdown/extra/#abbr)

- __\__ - `++inserted text++` (experimental)

- __\__ - `==marked text==` (experimental)



**HEADS UP!**: Experimental extensions can be changed later for something like [Critic Markup](http://criticmarkup.com/), but you will still be able to use old-style rules via external plugins if you prefer.



### Manage rules



```js

var md = new Remarkable();

md.inline.ruler.enable([ 'ins', 'mark' ]);

md.block.ruler.disable([ 'table', 'footnote' ]);



// Enable everything

md = new Remarkable('full', {

  html: true,

  typographer: true,

});



//

// Manually enable rules, disabled by default:

//

var md = new Remarkable();

md.core.ruler.enable([

  'abbr'

]);

md.block.ruler.enable([

  'footnote',

  'deflist'

]);

md.inline.ruler.enable([

  'footnote_inline',

  'ins',

  'mark',

  'sub',

  'sup'

]);

```



### Typographer



Although full-weight typographical replacements are language specific, `remarkable`

provides coverage for the most common and universal use cases:



```js

import { Remarkable } from 'remarkable';

var md = new Remarkable({

  typographer: true,

  quotes: '“”‘’'

});



// Disable rules at all:

md.core.ruler.disable([ 'replacements', 'smartquotes' ]);



// Actual default replacements:

//

// '' → ‘’

// "" → “”. Set '«»' for Russian, '„“' for German, empty to disable

// (c) (C) → ©

// (tm) (TM) → ™

// (r) (R) → ®

// +- → ±

// (p) (P) -> §

// ... → … (also ?.... → ?.., !.... → !..)

// ???????? → ???, !!!!! → !!!, `,,` → `,`

// -- → –, --- → —

//

```



Of course, you can also add your own rules or replace the defaults with something

more advanced or specific to your language.



### Plugins



Easily load plugins with the `.use()` method:



```js

var md = new Remarkable();



md.use(plugin1)

  .use(plugin2, opts)

  .use(plugin3);

```



Please refer to the [plugin documentation](docs/plugins.md) to create your own

plugins.



### linkify plugin



Autoconvert URL-like text to links



```js

import { Remarkable } from 'remarkable';

import { linkify } from 'remarkable/linkify';



var md = new Remarkable().use(linkify);

```



### UMD



UMD bundle provides linkify out of the box



```js

const { Remarkable, linkify, utils } = window.remarkable;

```



## 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:**



1. https://github.com/jgm/CommonMark - reference CommonMark implementations in C & JS,

   also contains latest spec & online demo.

2. http://talk.commonmark.org - CommonMark forum, good place to collaborate

   developers' efforts.



## Development / Modification



[Parser](docs/parser.md) consists of several responsibility chains filled with

rules. You can reconfigure any of them as you wish. [Renderer](docs/renderer.md) also

can be modified and extended. See source code to understand details. Pay

attention to these properties:



```js

Remarkable.core

Remarkable.core.ruler

Remarkable.block

Remarkable.block.ruler

Remarkable.inline

Remarkable.inline.ruler

Remarkable.renderer

Remarkable.renderer.rules

```



## Benchmark



Here is result of CommonMark spec parse at Core i5 2.4 GHz (i5-4258U):



```bash

$ benchmark/benchmark.js spec

Selected samples: (1 of 27)

 > spec



Sample: spec.txt (110610 bytes)

 > commonmark-reference x 40.42 ops/sec ±4.07% (51 runs sampled)

 > current x 74.99 ops/sec ±4.69% (67 runs sampled)

 > current-commonmark x 93.76 ops/sec ±1.23% (79 runs sampled)

 > marked-0.3.2 x 22.92 ops/sec ±0.79% (41 runs sampled)

```



As you can see, `remarkable` doesn't pay with speed for its flexibility. Because

it's written in monomorphic style and uses JIT inline caches effectively.



## Authors



- Jon Schlinkert [github/jonschlinkert](https://github.com/jonschlinkert)

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

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



## License



[MIT](https://github.com/jonschlinkert/remarkable/blob/master/LICENSE)