Validate HTML, CSS, JSON, XML and WCAG accessibility from an AI coding agent. No key needed.
Connect Runs on your machine
claude mcp add validatehtml -e VALIDATEHTML_API_KEY=<VALIDATEHTML_API_KEY> -- npx -y [email protected]{
"mcpServers": {
"validatehtml": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"VALIDATEHTML_API_KEY": "<VALIDATEHTML_API_KEY>"
}
}
}
}{
"mcpServers": {
"validatehtml": {
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"VALIDATEHTML_API_KEY": "<VALIDATEHTML_API_KEY>"
}
}
}
}{
"servers": {
"validatehtml": {
"type": "stdio",
"command": "npx",
"args": [
"-y",
"[email protected]"
],
"env": {
"VALIDATEHTML_API_KEY": "<VALIDATEHTML_API_KEY>"
}
}
}
}Replace the values in angle brackets with your own. Keys stay on your machine; we never see them.
Tools
This server runs locally, so its tools are listed by your MCP client once it starts.
Environment variables
| Name | Description |
|---|---|
VALIDATEHTML_API_KEYOptional, secret | Optional. Only audit_page needs it. 100 free calls a month. |
Details
| Package | [email protected] (NPM, stdio) |
| First published | 10 Nov 2026 |
| Last updated | 10 Nov 2026 |
| Registry name | io.github.theodcrx/validatehtml |
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