to-markdown is an HTML to Markdown converter written in JavaScript

From the readme:

There are a couple of known issues surrounding blockquotes in lists (and perhaps vice versa) — #2; and also how to handle HTML elements outside of the markdown subset (keep them/strip them?) — #3.

But this looks like a useful HTML to Markdown converter written in JavaScript. While this might just be a basic implementation that’s not yet fully bulletproof, creator Dom Christie says, “contributions are welcome.”

Check out the source on GitHub and the hosted demo that lets you paste in HTML and get back the Markdown output.