The marked npm package is a markdown parser and compiler built for speed. It converts markdown syntax to HTML, and it is designed to be as extensible and fast as possible.
Markdown Parsing
This feature allows you to parse markdown text and convert it to HTML. The code sample shows how to use marked to convert a simple markdown string into HTML.
const marked = require('marked');
console.log(marked('# Marked in Node.js\n\nRendered by **marked**.'));Options Customization
This feature allows you to customize the behavior of the marked parser by setting options such as GitHub Flavored Markdown (GFM), breaks, pedantic, sanitize, smart lists, and smartypants.
const marked = require('marked');
marked.setOptions({
renderer: new marked.Renderer(),
gfm: true,
breaks: false,
pedantic: false,
sanitize: false,
smartLists: true,
smartypants: false
});
console.log(marked('I am using __markdown__.'));Synchronous Parsing
This feature allows you to parse markdown synchronously, which is useful when you don't need to handle asynchronous operations.
const marked = require('marked');
const html = marked('## Synchronous markdown to HTML');
console.log(html);Asynchronous Parsing
This feature allows you to parse markdown asynchronously, which can be useful when dealing with file systems or network requests.
const marked = require('marked');
marked('# Asynchronous markdown to HTML', function(err, content) {
if (err) throw err;
console.log(content);
});Lexer and Parser
This feature exposes the lexer and parser, allowing you to generate tokens from markdown and then parse those tokens into HTML. This can be useful for advanced use-cases where you need to manipulate the tokens before parsing.
const marked = require('marked');
const tokens = marked.lexer('# Lexing markdown');
console.log(tokens);
const html = marked.parser(tokens);
console.log(html);Remarkable is an npm package that offers similar markdown parsing and rendering capabilities. It provides a full-featured markdown parser and compiler, and it emphasizes extensibility and performance, much like marked.
Showdown is another markdown to HTML converter that can be used both in the browser and on the server. It has a similar feature set to marked but also includes extensions which allow for additional syntax and features beyond the standard markdown.
Markdown-it is a modern markdown parser with a focus on speed and extensibility. It supports the CommonMark specification and has a similar feature set to marked, but it also includes a plugin system for extending its capabilities.
A full-featured markdown parser and compiler, written in JavaScript. Built for speed.
npm install marked --save
Minimal usage:
var marked = require('marked');
console.log(marked('I am using __markdown__.'));
// Outputs: <p>I am using <strong>markdown</strong>.</p>
Example setting options with default values:
var marked = require('marked');
marked.setOptions({
renderer: new marked.Renderer(),
gfm: true,
tables: true,
breaks: false,
pedantic: false,
sanitize: true,
smartLists: true,
smartypants: false
});
console.log(marked('I am using __markdown__.'));
<!doctype html>
<html>
<head>
<meta charset="utf-8"/>
<title>Marked in the browser</title>
<script src="lib/marked.js"></script>
</head>
<body>
<div id="content"></div>
<script>
document.getElementById('content').innerHTML =
marked('# Marked in browser\n\nRendered by **marked**.');
</script>
</body>
</html>
Type: string
String of markdown source to be compiled.
Type: object
Hash of options. Can also be set using the marked.setOptions method as seen
above.
Type: function
Function called when the markdownString has been fully parsed when using
async highlighting. If the options argument is omitted, this can be used as
the second argument.
Type: function
A function to highlight code blocks. The first example below uses async highlighting with node-pygmentize-bundled, and the second is a synchronous example using highlight.js:
var marked = require('marked');
var markdownString = '```js\n console.log("hello"); \n```';
// Async highlighting with pygmentize-bundled
marked.setOptions({
highlight: function (code, lang, callback) {
require('pygmentize-bundled')({ lang: lang, format: 'html' }, code, function (err, result) {
callback(err, result.toString());
});
}
});
// Using async version of marked
marked(markdownString, function (err, content) {
if (err) throw err;
console.log(content);
});
// Synchronous highlighting with highlight.js
marked.setOptions({
highlight: function (code) {
return require('highlight.js').highlightAuto(code).value;
}
});
console.log(marked(markdownString));
code
Type: string
The section of code to pass to the highlighter.
lang
Type: string
The programming language specified in the code block.
callback
Type: function
The callback function to call when using an async highlighter.
Type: object
Default: new Renderer()
An object containing functions to render tokens to HTML.
The renderer option allows you to render tokens in a custom manner. Here is an example of overriding the default heading token rendering by adding an embedded anchor tag like on GitHub:
var marked = require('marked');
var renderer = new marked.Renderer();
renderer.heading = function (text, level) {
var escapedText = text.toLowerCase().replace(/[^\w]+/g, '-');
return '<h' + level + '><a name="' +
escapedText +
'" class="anchor" href="#' +
escapedText +
'"><span class="header-link"></span></a>' +
text + '</h' + level + '>';
},
console.log(marked('# heading+', { renderer: renderer }));
This code will output the following HTML:
<h1>
<a name="heading-" class="anchor" href="#heading-">
<span class="header-link"></span>
</a>
heading+
</h1>
flags has the following properties:
{
header: true || false,
align: 'center' || 'left' || 'right'
}
Type: boolean
Default: true
Enable GitHub flavored markdown.
Type: boolean
Default: true
Enable GFM tables.
This option requires the gfm option to be true.
Type: boolean
Default: false
Enable GFM line breaks.
This option requires the gfm option to be true.
Type: boolean
Default: false
Conform to obscure parts of markdown.pl as much as possible. Don't fix any of
the original markdown bugs or poor behavior.
Type: boolean
Default: false
Sanitize the output. Ignore any HTML that has been input.
Type: boolean
Default: true
Use smarter list behavior than the original markdown. May eventually be
default with the old behavior moved into pedantic.
Type: boolean
Default: false
Use "smart" typograhic punctuation for things like quotes and dashes.
You also have direct access to the lexer and parser if you so desire.
var tokens = marked.lexer(text, options);
console.log(marked.parser(tokens));
var lexer = new marked.Lexer(options);
var tokens = lexer.lex(text);
console.log(tokens);
console.log(lexer.rules);
$ marked -o hello.html
hello world
^D
$ cat hello.html
<p>hello world</p>
The point of marked was to create a markdown compiler where it was possible to frequently parse huge chunks of markdown without having to worry about caching the compiled output somehow...or blocking for an unnecesarily long time.
marked is very concise and still implements all markdown features. It is also now fully compatible with the client-side.
marked more or less passes the official markdown test suite in its entirety. This is important because a surprising number of markdown compilers cannot pass more than a few tests. It was very difficult to get marked as compliant as it is. It could have cut corners in several areas for the sake of performance, but did not in order to be exactly what you expect in terms of a markdown rendering. In fact, this is why marked could be considered at a disadvantage in the benchmarks above.
Along with implementing every markdown feature, marked also implements GFM features.
node v0.8.x
$ node test --bench
marked completed in 3411ms.
marked (gfm) completed in 3727ms.
marked (pedantic) completed in 3201ms.
robotskirt completed in 808ms.
showdown (reuse converter) completed in 11954ms.
showdown (new converter) completed in 17774ms.
markdown-js completed in 17191ms.
Marked is now faster than Discount, which is written in C.
For those feeling skeptical: These benchmarks run the entire markdown test suite 1000 times. The test suite tests every feature. It doesn't cater to specific aspects.
You also have direct access to the lexer and parser if you so desire.
var tokens = marked.lexer(text, options);
console.log(marked.parser(tokens));
var lexer = new marked.Lexer(options);
var tokens = lexer.lex(text);
console.log(tokens);
console.log(lexer.rules);
$ node
> require('marked').lexer('> i am using marked.')
[ { type: 'blockquote_start' },
{ type: 'paragraph',
text: 'i am using marked.' },
{ type: 'blockquote_end' },
links: {} ]
If you want to submit a pull request, make sure your changes pass the test suite. If you're adding a new feature, be sure to add your own test.
The marked test suite is set up slightly strangely: test/new is for all tests
that are not part of the original markdown.pl test suite (this is where your
test should go if you make one). test/original is only for the original
markdown.pl tests. test/tests houses both types of tests after they have been
combined and moved/generated by running node test --fix or marked --test --fix.
In other words, if you have a test to add, add it to test/new/ and then
regenerate the tests with node test --fix. Commit the result. If your test
uses a certain feature, for example, maybe it assumes GFM is not enabled, you
can add .nogfm to the filename. So, my-test.text becomes
my-test.nogfm.text. You can do this with any marked option. Say you want
line breaks and smartypants enabled, your filename should be:
my-test.breaks.smartypants.text.
To run the tests:
cd marked/
node test
If you contribute code to this project, you are implicitly allowing your code
to be distributed under the MIT license. You are also implicitly verifying that
all code is your original work. </legalese>
Copyright (c) 2011-2014, Christopher Jeffrey. (MIT License)
See LICENSE for more info.
FAQs
A markdown parser built for speed
The npm package marked receives a total of 8,779,179 weekly downloads. As such, marked popularity was classified as popular.
We found that marked demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 0 open source maintainers collaborating on the project.
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