toc-to-html

toc-to-html can change one-level array toc (table of contents) to a nested html list.

Example toc

Let's say we have toc that looks like this:

const toc = [
  {
    content: 'Coffee',
    slug: 'coffee',
    lvl: 2
  },
  {
    content: 'Tea',
    slug: 'tea',
    lvl: 2
  },
  {
    content: 'Black tea',
    slug: 'black-tea',
    lvl: 3
  },
  {
    content: 'Green tea',
    slug: 'green-tea',
    lvl: 3
  },
  {
    content: 'Milk',
    slug: 'milk',
    lvl: 2
  }
];

toc can be created by markdown-toc or other if following same structure.

Example html

The html we get:

<ul>
  <li><a href="#coffee">Coffee</a></li>
  <li><a href="#tea">Tea</a>
    <ul>
      <li><a href="#black-tea">Black tea</a></li>
      <li><a href="#green-tea">Green tea</a></li>
    </ul>
  </li>
  <li><a href="#milk">Milk</a></li>
</ul>

How to use

const tocToHtml = require('toc-to-html');
const toc = [
  /* as above toc */
];

/* change toc to html */
const html = tocToHtml(toc, /* options */);

/* see html */
console.log(html);

options

// ...
const options = {
  id: 'toc-list', // is optional
  clazz: 'list' // is optional
};

const html = tocToHtml(toc, options);

<ul id="toc-list" class="list">
  <!-- items -->
</ul>

When to use

• when putting <!-- toc --> into every markdown file to inject the HTML at that position takes too much time and also is nightmare to change the position later as every file needs to be updated

• when you need full control over where you put the HTML by using a template library (pug, ejs, handlebars, mustache, or other) and passing the HTML via data

• when the HTML list created by a compiler (marked, markdown-it, remarkable, showdown, or other) doesn't have id or class but you need that control or more versatility