node-cmark

node-cmark is a Node.js wrapper around GitHub's fork of cmark, the reference implementation of CommonMark in C by John MacFarlane. You can find GitHub's fork at https://github.com/github/cmark.

Installation

npm install @binarymuse/cmark

Usage

html = renderHtmlSync(markdown[, options])

• markdown - a string containing Markdown to render to HTML
• options - a hash of options (see Options, below)

renderHtml(markdown[, options], callback)

• markdown - a string containing Markdown to render to HTML
• options - a hash of options (see Options, below)
• callback - a function to call with the resulting HTML once the Markdown has been rendered
  • html - the resulting HTML

Options

You can control the behavior of node-cmark by passing options to the rendering functions. The available options are:

• sourepos - if true, adds a data-sourcepos attribute to all block elements that TODO??
• safe - if true, suppresses raw HTML and unsafe links (javascript:, vbscript:, file:, and data: except for image/png, image/gif, image/jpeg, or image/webp mime types). Raw HTML is replaced by a placeholder HTML comment. Unsafe links are replaced with empty strings.
• nobreaks - if true, renders softbreak elements as spaces
• hardbreaks - if true, renders softbreak elements as hard line breaks
• normalize - if true, adjacent text nodes are consolidated
• validateUtf8 - if true, replaces illegal UTF-8 sequences with U+FFFD
• smart - if true, replaces straight quotes with curly ones, turns --- into em dashes, and -- into en dashes
• extensions - an array of extensions to enable. Valid extensions are:
  • "table" - render tables
  • "strikethrough" - strikethrough
  • "tagfilter" - whitelist something
  • "autolink" - automatically turn URLs into links

Rendering to HTML

You can turn a string containing Markdown into HTML either synchronously:

const cmark = require('node-cmark')

const markdown = '# Hello World'
const options = {}
const html = cmark.renderHtmlSync(markdown, options)
console.log(html)

or asynchronously

const cmark = require('node-cmark')

const markdown = '# Hello World'
const options = {}
cmark.renderHtml(markdown, options, (html) => {
  console.log(html)
})

Note that options may be omitted in either invocation.