validatehtml for Claude Code

io.github.theodcrx/validatehtml

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

client:Claude Code transport:stdio runtime:npm

Install validatehtml in Claude Code

run in your project directory

claude mcp add validatehtml -e VALIDATEHTML_API_KEY=<VALIDATEHTML_API_KEY> -- npx -y validatehtml

Adds it for this project only. Append --scope user to make it available everywhere. Claude Code docs