remark-slug

What is remark-slug?

The remark-slug npm package is a plugin for the remark Markdown processor that automatically adds slugs to headings in a Markdown document. This is useful for generating links to specific sections of the document, enhancing navigation and accessibility.

What are remark-slug's main functionalities?

Automatic Slug Generation

This feature automatically generates slugs for each heading in a Markdown document. The code sample shows how to use remark-slug with remark and remark-html to convert a Markdown heading into HTML with a slug.

const remark = require('remark');
const remarkHtml = require('remark-html');
const remarkSlug = require('remark-slug');

remark()
  .use(remarkSlug)
  .use(remarkHtml)
  .process('# Hello world', function (err, file) {
    console.log(String(file));
  });

Other packages similar to remark-slug

markdown-it-anchor

markdown-it-anchor is a plugin for the markdown-it Markdown parser. Similar to remark-slug, it adds anchors to headings in Markdown documents. While remark-slug is specifically designed for the remark ecosystem, markdown-it-anchor serves the markdown-it ecosystem, offering similar functionality but within a different processing environment.

rehype-slug

rehype-slug is a plugin for the rehype processor, which is part of the unified.js ecosystem, similar to remark. It adds slugs to HTML elements processed through rehype. This is akin to what remark-slug does but is applied directly to HTML rather than Markdown, making it suitable for projects that work with HTML content at a later stage in the content pipeline.

README

remark-slug

remark plugin to add anchors headings using GitHub’s algorithm.

⚠️ Note: This is often useful when compiling to HTML. If you’re doing that, it’s probably smarter to use remark-rehype and rehype-slug and benefit from the rehype ecosystem.

Install

npm:

npm install remark-slug

Use

Say we have the following file, example.md:

# Lorem ipsum 😪

## dolor—sit—amet

### consectetur & adipisicing

#### elit

##### elit

And our script, example.js, looks as follows:

var fs = require('fs')
var unified = require('unified')
var markdown = require('remark-parse')
var slug = require('remark-slug')
var remark2rehype = require('remark-rehype')
var html = require('rehype-stringify')

unified()
  .use(markdown)
  .use(slug)
  .use(remark2rehype)
  .use(html)
  .process(fs.readFileSync('example.md'), function(err, file) {
    if (err) throw err
    console.log(String(file))
  })

Now, running node example yields:

<h1 id="lorem-ipsum-">Lorem ipsum 😪</h1>
<h2 id="dolorsitamet">dolor—sit—amet</h2>
<h3 id="consectetur--adipisicing">consectetur &#x26; adipisicing</h3>
<h4 id="elit">elit</h4>
<h5 id="elit-1">elit</h5>

API

remark().use(slug)

Add anchors headings using GitHub’s algorithm.

Uses github-slugger to creates GitHub-style slugs.

Sets data.id and data.hProperties.id on headings. The first can be used by any plugin as a unique identifier, the second tells mdast-util-to-hast (used in remark-html and remark-rehype) to use its value as an id attribute.

Security

Use of remark-slug can open you up to a cross-site scripting (XSS) attack as it sets id attributes on headings. In a browser, elements are retrievable by id with JavaScript and CSS. If a user injects a heading that slugs to an id you are already using, the user content may impersonate the website.

Always be wary with user input and use rehype-sanitize.

Related

• rehype-slug — Add slugs to headings in HTML

Contribute

See contributing.md in remarkjs/.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.

License

MIT © Titus Wormer