text-markdown-to-html Edge Function — Content

text-markdown-to-html — Convert Markdown to HTML

Converts Markdown text to safe HTML. Supports all common Markdown syntax and optionally strips script tags and event handlers to prevent XSS.

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API

POST /api/text-markdown-to-html

Request body

Field	Type	Required	Default	Description
markdown	string	✅	—	The Markdown text to convert
sanitize	boolean	❌	true	Strip script tags and event handlers from output

Success response (200)

{
  "success": true,
  "data": {
    "html": "<h1>Hello World</h1>\n<p>This is a <strong>bold</strong> paragraph.</p>"
  }
}

Error responses

Code	HTTP	When
INVALID_INPUT	400	Missing or invalid markdown field
INTERNAL_ERROR	500	Unexpected processing error

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Usage

cURL

curl -X POST "$FUNCTION_URL/api/text-markdown-to-html" \
  -H "Content-Type: application/json" \
  -d '{"markdown": "# Hello\n\nThis is **bold** and *italic*."}'

TypeScript / JavaScript (HTTP)

const response = await fetch(`${FUNCTION_URL}/api/text-markdown-to-html`, {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    markdown: '# Hello\n\nThis is **bold** and *italic*.',
    sanitize: true,
  }),
});
const { data } = await response.json();
console.log(data.html);
// <h1>Hello</h1>
// <p>This is <strong>bold</strong> and <em>italic</em>.</p>

Direct import (Node / Bun / Deno)

import { markdownToHtml } from '@aerostack/functions/text-markdown-to-html';

const result = markdownToHtml({
  markdown: '## Section\n\nSome `code` here.',
  sanitize: true,
});
console.log(result.html);

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Supported Syntax

Markdown	HTML Output
# Heading	<h1>, <h2>, ..., <h6>
**bold** / __bold__	<strong>
*italic* / _italic_	<em>
`code`	<code>
```lang\ncode\n```	<pre><code class="language-lang">
[text](url)	<a href="url">
	<img src="url" alt="alt">
- item / * item / + item	<ul><li>
1. item	<ol><li>
> quote	<blockquote>
--- / ***	<hr>
Two trailing spaces + newline	<br>

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Use Cases

• AI chat interfaces: Convert AI-generated Markdown responses to HTML before rendering in a web UI or mobile app.
• CMS content pipelines: Transform Markdown articles stored in a database to HTML for display on a website.
• Email generation: Convert Markdown-authored email templates to HTML for sending via transactional email services.
• Documentation sites: Render README files and documentation pages stored as Markdown.

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Notes

• sanitize: true (default) removes <script> tags and all on* event handler attributes to prevent XSS attacks.
• Set sanitize: false only when you fully trust the input source.
• This is a pure regex-based implementation — no external parser libraries are used.
• Very large Markdown documents (>1MB) may see some performance overhead.