micromark extension to support GFM (GitHub Flavored Markdown)

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micromark extension to support GitHub flavored markdown (GFM).


*   [`gfm(options?)`](#gfmoptions)
*   [`gfmHtml(htmlOptions?)`](#gfmhtmlhtmloptions)

What is this?

This package is a micromark extension to add support for all GFM features: autolink literals, footnotes, strikethrough, tables, tagfilter, and tasklists.

When to use this

You probably should use this package if you use micromark and want to enable GFM. When working with syntax trees, you’d want to combine this package with mdast-util-gfmmdast-util-gfm.
You can also use the underlying features separately:
— support GFM [autolink literals][]
— support GFM footnotes
— support GFM [strikethrough][]
— support GFM [tables][]
— support GFM [tagfilter][]
— support GFM [tasklists][]
These tools are all rather low-level. In most cases, you’d instead want to use remark-gfmremark-gfm with remark.


This package is ESM onlyesm. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:
npm install micromark-extension-gfm

In Deno with Skypack:
import {gfm, gfmHtml} from 'https://cdn.skypack.dev/micromark-extension-gfm@2?dts'

In browsers with Skypack:
<script type="module">
  import {gfm, gfmHtml} from 'https://cdn.skypack.dev/micromark-extension-gfm@2?min'


Say we have the following file example.md:

## Autolink literals

www.example.com, https://example.com, and contact@example.com.

## Footnote

A note[^1]

## Strikethrough

~one~ or ~~two~~ tildes.

## Table

| a | b  |  c |  d  |
| - | :- | -: | :-: |

## Tag filter


## Tasklist

* [ ] to do
* [x] done

And our module example.js looks as follows:
import fs from 'node:fs'
import {micromark} from 'micromark'
import {gfm, gfmHtml} from 'micromark-extension-gfm'

const output = micromark(fs.readFileSync('example.md'), {
  allowDangerousHtml: true,
  extensions: [gfm()],
  htmlExtensions: [gfmHtml()]


Now, running node example yields:
<h2>Autolink literals</h2>
<p><a href="http://www.example.com">www.example.com</a>, <a href="https://example.com">https://example.com</a>, and <a href="mailto:contact@example.com">contact@example.com</a>.</p>
<p>A note<sup><a href="#user-content-fn-1" id="user-content-fnref-1" data-footnote-ref="" aria-describedby="footnote-label">1</a></sup></p>
<p><del>one</del> or <del>two</del> tildes.</p>
<th align="left">b</th>
<th align="right">c</th>
<th align="center">d</th>
<h2>Tag filter</h2>
<li><input type="checkbox" disabled="" /> to do</li>
<li><input type="checkbox" disabled="" checked="" /> done</li>
<section data-footnotes="" class="footnotes"><h2 id="footnote-label" class="sr-only">Footnotes</h2>
<li id="user-content-fn-1">
<p>Big note. <a href="#user-content-fnref-1" data-footnote-backref="" class="data-footnote-backref" aria-label="Back to content">↩</a></p>


This package exports the following identifiers: gfm, gfmHtml. There is no default export.
This extensions supports the endorsed development conditiondev. Run node --conditions development module.js to get instrumented dev code. Without this condition, production code is loaded.


A function that can be called to get an extension for micromark to parse GFM (can be passed in extensions).
Configuration (optional).
Whether to support strikethrough with a single tilde (boolean, default: true). Single tildes work on github.com, but are technically prohibited by GFM. Passed as singleTildesingle-tilde in micromark-extension-gfm-strikethroughgfm-strikethrough.


A function that can be called to get an extension to compile GFM to HTML (can be passed in htmlExtensions).
Configuration (optional).
Prefix to use before the id attribute to prevent it from clobbering attributes (string, default: 'user-content-'). Passed as clobberPrefixclobber-prefix in micromark-extension-gfm-footnotegfm-footnote.
Label to use for the footnotes section (string, default: 'Footnotes'). Passed as labellabel in micromark-extension-gfm-footnotegfm-footnote.
Label to use from backreferences back to their footnote call (string, default: 'Back to content'). Passed as backLabelbacklabel in micromark-extension-gfm-footnotegfm-footnote.


This package is fully typed with TypeScript. It exports additional Options and HtmlOptions types that model their respective interfaces.


This package is at least compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. It also works in Deno and modern browsers.


This package is safe by default.


— support GFM in mdast
— support GFM in remark
— support GFM [autolink literals][]
— support GFM footnotes
— support GFM [strikethrough][]
— support GFM [tables][]
— support GFM [tagfilter][]
— support GFM [tasklists][]


See contributing.md in micromark/.githubcontributing for ways to get started. See support.mdsupport for ways to get help.
This project has a code of conductcoc. By interacting with this repository, organization, or community you agree to abide by its terms.


MITlicense © Titus Wormerauthor