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markdown-it-anchor npm version

Header anchors for markdown-it.


const md = require('markdown-it')()
  .use(require('markdown-it-anchor'), opts)

See a demo as JSFiddle.

The opts object can contain:

Name Description Default
level Minimum level to apply anchors on or array of selected levels. 1
slugify A custom slugification function. string.js' slugify
permalink Whether to add permalinks next to titles. false
renderPermalink A custom permalink rendering function. See index.es6.js
permalinkClass The class of the permalink anchor. header-anchor
permalinkSymbol The symbol in the permalink anchor.
permalinkBefore Place the permalink before the title. false
permalinkHref A custom permalink href rendering function. See index.es6.js
callback Called with token and info after rendering. undefined

The renderPermalink function takes the slug, an options object with the above options, and then all the usual markdown-it rendering arguments.

All headers above level will then have an id attribute with a slug of their content. level can also be an array of headers levels to apply the anchor, like [2, 3] to have an anchor on only level 2 and 3 headers.

If permalink is true, a symbol linking to the header itself will be added.

You may want to use the link symbol as permalinkSymbol, or a symbol from your favorite web font.

The callback option is a function that will be called at the end of rendering with the token and an info object. The info object has title and slug properties with the token content and the slug used for the identifier.