Project: syntax-tree/mdast-util-toc

Package: mdast-util-toc@6.1.0

  1. Dependents: 0
  2. mdast utility to generate a table of contents from a tree
  1. markdown 151
  2. util 147
  3. utility 143
  4. unist 133
  5. mdast 88
  6. mdast-util 31
  7. table 13
  8. toc 4
  9. contents 3


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mdast utility to generate a table of contents.


What is this?

This package is a utility that generates a table of contents from a document.

When should I use this?

This utility is useful to generate a section so users can more easily navigate through a document.

This package is wrapped in remark-toc for ease of use with remark, where it also injects the table of contents into the document.


This package is ESM only. In Node.js (version 12.20+, 14.14+, or 16.0+), install with npm:

npm install mdast-util-toc

In Deno with esm.sh:

import {toc} from 'https://esm.sh/mdast-util-toc@6'

In browsers with esm.sh:

<script type="module">
  import {toc} from 'https://esm.sh/mdast-util-toc@6?bundle'



 * @typedef {import('mdast').Root} Root

import {u} from 'unist-builder'
import {toc} from 'mdast-util-toc'

Now running:

const tree = /** @type {Root} */ (
  u('root', [
    u('heading', {depth: 1}, [u('text', 'Alpha')]),
    u('heading', {depth: 2}, [u('text', 'Bravo')]),
    u('heading', {depth: 3}, [u('text', 'Charlie')]),
    u('heading', {depth: 2}, [u('text', 'Delta')])

const table = toc(tree)


  index: null,
  endIndex: null,
  map: {
    type: 'list',
    ordered: false,
    spread: true,
    children: [ { type: 'listItem', spread: true, children: [Array] } ]


This package exports the identifier toc. There is no default export.

toc(node[, options])

Generate a table of contents from node.

Looks for the first heading matching options.heading (case insensitive) and returns a table of contents (a list) for all following headings. If no heading is specified, creates a table of contents for all headings in tree. tree is not changed.

Links in the list to headings are based on GitHub’s style. Only top-level headings (those not in blockquotes or lists), are used. This default behavior can be changed by passing options.parents.


Configuration (optional).


Heading to look for (string), wrapped in new RegExp('^(' + value + ')$', 'i').


Maximum heading depth to include in the table of contents (number, default: 6), This is inclusive: when set to 3, level three headings are included (those with three hashes, ###).


Headings to skip (string, optional), wrapped in new RegExp('^(' + value + ')$', 'i'). Any heading matching this expression will not be present in the table of contents.


Whether to compile list items tightly (boolean?, default: false).


Whether to compile list items as an ordered list (boolean?, default: false).


Add a prefix to links to headings in the table of contents (string?, default: null). Useful for example when later going from mdast to hast and sanitizing with hast-util-sanitize.


Allow headings to be children of certain node types (default: the to toc given node, to only allow top-level headings). Internally, uses unist-util-is, so parents can be any is-compatible test.

For example, the following code would allow headings under either root or blockquote to be used:

toc(tree, {parents: ['root', 'blockquote']})

An object representing the table of contents:


This package is fully typed with TypeScript. It exports the types Options and Result.


Projects maintained by the unified collective are compatible with all maintained versions of Node.js. As of now, that is Node.js 12.20+, 14.14+, and 16.0+. Our projects sometimes work with older versions, but this is not guaranteed.


Use of mdast-util-toc does not involve hast, user content, or change the tree, so there are no openings for cross-site scripting (XSS) attacks.

Injecting map into the syntax tree may open you up to XSS attacks as existing nodes are copied into the table of contents. The following example shows how an existing script is copied into the table of contents.

For the following Markdown:

# Alpha

## Bravo<script>alert(1)</script>

## Charlie

Yields in map:

-   [Alpha](#alpha)

    -   [Bravo<script>alert(1)</script>](#bravoscriptalert1script)
    -   [Charlie](#charlie)

Always use hast-util-santize when transforming to hast.


See contributing.md in syntax-tree/.github for ways to get started. See support.md for ways to get help.

This project has a code of conduct. By interacting with this repository, organization, or community you agree to abide by its terms.


MIT © Jonathan Haines