Validatehtml

io.github.theodcrx/validatehtml

Validate HTML, CSS, JSON, XML and WCAG accessibility from an AI coding agent. No key needed.

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Connect this server

Add this to your MCP client config — claude_desktop_config.json (Claude Desktop) or .cursor/mcp.json (Cursor).Suits: Claude Desktop · Cursor.

{
  "mcpServers": {
    "validatehtml": {
      "command": "npx",
      "args": [
        "-y",
        "validatehtml@0.1.0"
      ],
      "env": {
        "VALIDATEHTML_API_KEY": "<your VALIDATEHTML_API_KEY>"
      }
    }
  }
}
Environment variables
  • VALIDATEHTML_API_KEYsecretOptional. Only audit_page needs it. 100 free calls a month.

A starting point — check the repository for exact arguments and setup. Restart your client after editing the config.

Category
Search & Web
Version
0.1.0
Registry
active
Published
11/10/2026

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Add the badge to your site

Show visitors that Validatehtml is listed here — it’s also the link we check for a free listing.

Validatehtml — listed on Serverdex

HTML — for your website

<a href="https://serverdex.io/server/io-github-theodcrx-validatehtml?utm_source=badge"><img src="https://serverdex.io/brand/badge.svg" alt="Validatehtml — listed on Serverdex" width="123" height="40" loading="lazy"></a>

Recommended. A dofollow link from your own domain is the one that counts for search engines, and it's the link we check for a free listing.

Markdown — for your README

[![Validatehtml — listed on Serverdex](https://serverdex.io/brand/badge.svg)](https://serverdex.io/server/io-github-theodcrx-validatehtml?utm_source=badge)

Nice for visibility, but GitHub marks README links nofollow, so it doesn't pass authority. Use the HTML badge on your site as well.