mdast extension to parse and serialize GFM footnotes

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mdast extensions to parse and serialize GFM footnotes.


*   [`gfmFootnoteFromMarkdown()`](#gfmfootnotefrommarkdown)
*   [`gfmFootnoteToMarkdown()`](#gfmfootnotetomarkdown)
*   [Nodes](#nodes)
*   [Content model](#content-model)

What is this?

This package contains two extensions that add support for GFM footnote syntax in markdown to mdast. These extensions plug into mdast-util-from-markdownmdast-util-from-markdown (to support parsing footnotes in markdown into a syntax tree) and mdast-util-to-markdownmdast-util-to-markdown (to support serializing footnotes in syntax trees to markdown).
GFM footnotes were announced September 30, 2021post but are not specified. Their implementation on is currently buggy. The bugs have been reported on cmark-gfmcmark-gfm.

When to use this

You can use these extensions when you are working with mdast-util-from-markdown and mdast-util-to-markdown already.
When working with mdast-util-from-markdown, you must combine this package with micromark-extension-gfm-footnotemicromark-extension-gfm-footnote.
When you don’t need a syntax tree, you can use micromarkmicromark directly with micromark-extension-gfm-footnote.
When you are working with syntax trees and want all of GFM, use mdast-util-gfmmdast-util-gfm instead.
All these packages are used remark-gfmremark-gfm, which focusses on making it easier to transform content by abstracting these internals away.
This utility does not handle how markdown is turned to HTML. That’s done by mdast-util-to-hastmdast-util-to-hast. If your content is not in English, you should configure that utility.


This package is ESM onlyesm. In Node.js (version 14.14+ and 16.0+), install with npm:
npm install mdast-util-gfm-footnote

In Deno with esm.shesmsh:
import {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from ''

In browsers with esm.shesmsh:
<script type="module">
  import {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from ''


Say our document contains:

…and our module example.js looks as follows:
import fs from 'node:fs/promises'
import {fromMarkdown} from 'mdast-util-from-markdown'
import {toMarkdown} from 'mdast-util-to-markdown'
import {gfmFootnote} from 'micromark-extension-gfm-footnote'
import {gfmFootnoteFromMarkdown, gfmFootnoteToMarkdown} from 'mdast-util-gfm-footnote'

const doc = await fs.readFile('')

const tree = fromMarkdown(doc, {
  extensions: [gfmFootnote()],
  mdastExtensions: [gfmFootnoteFromMarkdown()]


const out = toMarkdown(tree, {extensions: [gfmFootnoteToMarkdown()]})


…now running node example.js yields (positional info removed for brevity):
  type: 'root',
  children: [
      type: 'paragraph',
      children: [
        {type: 'text', value: 'Hi!'},
        {type: 'footnoteReference', identifier: '1', label: '1'}
      type: 'footnoteDefinition',
      identifier: '1',
      label: '1',
      children: [
        {type: 'paragraph', children: [{type: 'text', value: 'big note'}]}



This package exports the identifiers gfmFootnoteFromMarkdownapi-gfmfootnotefrommarkdown and gfmFootnoteToMarkdownapi-gfmfootnotetomarkdown. There is no default export.


Create an extension for mdast-util-from-markdownmdast-util-from-markdown to enable GFM footnotes in markdown.
Extension for mdast-util-from-markdown (FromMarkdownExtensionfrommarkdownextension).


Create an extension for mdast-util-to-markdownmdast-util-to-markdown to enable GFM footnotes in markdown.
Extension for mdast-util-to-markdown (ToMarkdownExtensiontomarkdownextension).


This utility does not handle how markdown is turned to HTML. That’s done by mdast-util-to-hastmdast-util-to-hast. If your content is not in English, you should configure that utility.


See Syntax in micromark-extension-frontmattersyntax.

Syntax tree

The following interfaces are added to mdast by this utility.



interface FootnoteDefinition <: Parent {
  type: 'footnoteDefinition'
  children: [FlowContent]

FootnoteDefinition includes Association

FootnoteDefinition (Parentdfn-parent) represents content relating to the document that is outside its flow.
FootnoteDefinition can be used where flowdfn-flow-content content is expected. Its content model is also flowdfn-flow-content content.
FootnoteDefinition includes the mixin Associationdfn-mxn-association.
FootnoteDefinition should be associated with FootnoteReferencesdfn-footnote-reference.
For example, the following markdown:
```markdown ```
  type: 'footnoteDefinition',
  identifier: 'alpha',
  label: 'alpha',
  children: [{
    type: 'paragraph',
    children: [{type: 'text', value: 'bravo and charlie.'}]


interface FootnoteReference <: Node {
  type: 'footnoteReference'

FootnoteReference includes Association

FootnoteReference (Nodedfn-node) represents a marker through association.
FootnoteReference can be used where static phrasingdfn-static-phrasing-content content is expected. It has no content model.
FootnoteReference includes the mixin Associationdfn-mxn-association.
FootnoteReference should be associated with a FootnoteDefinitiondfn-footnote-definition.
For example, the following markdown:

  type: 'footnoteReference',
  identifier: 'alpha',
  label: 'alpha'

Content model

FlowContent (GFM footnotes)

type FlowContentGfm = FootnoteDefinition | FlowContent

StaticPhrasingContent (GFM footnotes)

type StaticPhrasingContentGfm = FootnoteReference | StaticPhrasingContent


This package is fully typed with TypeScript
. It does not export additional types.
The FootnoteDefinition and FootnoteReference types of the mdast nodes are exposed from @types/mdast.


Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 14.14+ and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.
This plugin works with mdast-util-from-markdown version 1+ and mdast-util-to-markdown version 1+.


— remark plugin to support GFM
— same but all of GFM (autolink literals, footnotes, strikethrough, tables,
— micromark extension to parse GFM footnotes


See contributing.mdcontributing in syntax-tree/.githubhealth 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