markdown-toc

Generate a markdown TOC (table of contents) with Remarkable.

• Won't mangle markdown in code examples (like headings in gfm fenced code blocks that other TOC generators mistake as being real headings)
• Uses sane defaults, so no customization is necessary, but you can if you need to.
• Get JSON to generate your own TOC from whatever templates you want to use
• filter out headings you don't want
• Improve the headings you do want

Install with npm

npm i markdown-toc --save

Related projects

• remarkable: Markdown parser, done right. 100% Commonmark support, extensions, syntax plugins, high speed - all in one.
• markdown-utils: Micro-utils for creating markdown snippets.
• markdown-link: Micro util for generating a single markdown link.
• gfm-code-blocks: Extract gfm (GitHub Flavored Markdown) fenced code blocks from a string.

Usage

var toc = require('markdown-toc');

toc('# One\n\n# Two').content;
// Results in:
// - [One](#one)
// - [Two](#two)

To allow customization of the output, an object is returned with the following properties:

• content {String}: The generated table of contents. Unless you want to customize rendering, this is all you need.
• highest {Number}: The highest level heading found. This is used to adjust indentation.
• tokens {Array}: Headings tokens that can be used for custom rendering

API

toc.json

Object for creating a custom TOC.

toc('# AAA\n## BBB\n### CCC\nfoo').json;

// results in
[ { content: 'AAA', lvl: 1 },
  { content: 'BBB', lvl: 2 },
  { content: 'CCC', lvl: 3 } ]

toc.insert

Insert a table of contents immediately after an opening `

code comment, or replace an existing TOC if both an _opening_ comment and a _closing_ comment (

`) are found.

(This strategy works well since code comments in markdown are hidden when viewed as HTML, like when viewing a README on GitHub README for example).

Example

- old toc 1
- old toc 2
- old toc 3

## abc
This is a b c.

## xyz
This is x y z.

Would result in something like:

- [abc](#abc)
- [xyz](#xyz)

## abc
This is a b c.

## xyz
This is x y z.

Utility functions

As a convenience to folks who wants to create a custom TOC, markdown-toc's internal utility methods are exposed:

var toc = require('markdown-toc');

• toc.bullets(): render a bullet list from an array of tokens
• toc.linkify(): linking a heading content string
• toc.slugify(): slugify a heading content string
• toc.strip(): strip words or characters from a heading content string

Example

var result = toc('# AAA\n## BBB\n### CCC\nfoo');
var str = '';

result.json.forEach(function(heading) {
  str += toc.linkify(heading.content);
});

Options

options.append

Append a string to the end of the TOC.

toc(str, {append: '\n_(TOC generated by Verb)_'});

options.filter

Type: Function

Default: undefined

Params:

• str {String} the actual heading string
• ele {Objecct} object of heading tokens
• arr {Array} all of the headings objects

Example

From time to time, we might get junk like this in our TOC.

[.aaa([foo], ...) another bad heading](#-aaa--foo--------another-bad-heading)

Unless you like that kind of thing, you might want to filter these bad headings out.

function removeYunk(str, ele, arr) {
  return str.indexOf('...') === -1;
}

var result = toc(str, {filter: removeYunk});
//=> beautiful TOC, sans "Yunk"? wtf is "Yunk" 
// anyway? Look, j and y are kind of sort of 
// close on the keyboard. Regardless, it gets the 
// yunk out of your headings.

options.bullets

Type: String|Array

Default: *

The bullet to use for each item in the generated TOC. If passed as an array (['*', '-', '+']), the bullet point strings will be used based on the header depth.

options.maxDepth

Type: Number

Default: 3

Use headings whose depth is at most maxDepth.

options.firsth1

Type: Boolean

Default: true

Exclude the first h1-level heading in a file. For example, this prevents the first heading in a README from showing up in the TOC.

Running tests

Install dev dependencies.

npm i -d && npm test

Contributing

Pull requests and stars are always welcome. For bugs and feature requests, please create an issue

Author

Jon Schlinkert

• github/jonschlinkert
• twitter/jonschlinkert

License

Copyright (c) 2014-2015 Jon Schlinkert
Released under the MIT license

This file was generated by verb-cli on March 25, 2015.