@markdown-ui/marked-ext

Turn your Markdown parser into a widget factory.

Transform markdown-ui-widget code blocks into interactive components with zero configuration.

✨ Try the live demo ✨

Works with any Marked.js setup—just add the extension and widgets come alive.

Get started in 30 seconds

npm install @markdown-ui/marked-ext marked

import { Marked } from 'marked';
import { markedUiExtension } from '@markdown-ui/marked-ext';

const marked = new Marked();
marked.use(markedUiExtension);

// This markdown...
const markdown = `
\`\`\`markdown-ui-widget
select env [dev staging prod]
\`\`\`
`;

const html = marked.parse(markdown);
// ...becomes interactive widgets!

Two syntaxes, same magic

Write widgets in JSON (traditional) or DSL (60% more concise):

DSL ⚡

text-input username "Username" "Enter username"
button-group env [dev staging prod] dev
select region [us-east-1 us-west-2] us-east-1
form config "Submit"
  text-input name "Name" 
  select env [dev prod]
chart-line
title: Revenue Growth
Month,Sales
Jan,100
Feb,150

JSON 📝

{"type": "text-input", "id": "username", "label": "Username"}

Both work identically—the extension auto-detects the format.

How it works

1. Detects markdown-ui-widget code blocks in your Markdown
2. Encodes widget config as URL-encoded JSON with unique IDs
3. Generates <markdown-ui-widget> custom elements
4. Renders with your framework (React, Svelte, Vue)

Perfect separation—any parser, any renderer, any framework.

Next step: Add a renderer like @markdown-ui/react or @markdown-ui/svelte to see your widgets come alive.

MIT © 2025