This server does not currently have a deployable release on Glama. Follow the repository's setup instructions to install and configure it for your MCP client, including any required credentials and local dependencies.
Validate HTML, CSS, JSON, XML and accessibility from your terminal or your AI coding agent. Errors are spec violations, warnings are best practices, and modern valid code stays clean.
npx validatehtml index.html
npx validatehtml https://example.com
npx validatehtml http://localhost:3000 --type accessibilityNo account and no key. Exit code 0 when it passes, 1 when it fails, 2 when it could not run, so it fits in a script or a build.
Claude Code:
claude mcp add validatehtml -- npx -y validatehtml mcpCursor, Windsurf, VS Code and any other MCP client:
{
"mcpServers": {
"validatehtml": { "command": "npx", "args": ["-y", "validatehtml", "mcp"] }
}
}Tool | What it does | Key |
| Checks HTML, CSS, JSON, XML, or HTML for WCAG issues | No |
| The same on a local file, without reading it into the conversation | No |
| Checks a live page, including a dev server on localhost | No |
| Every check on one deployed page: HTML, accessibility, meta tags, Open Graph, page weight | Yes |
| A link for you to scan a whole site in your browser | No |
Related MCP server: accessibility-mcp-server
validatehtml <file|url|-> [--type html|css|json|xml|accessibility]
[--audit] [--fail-on error|warning] [--format text|json]
validatehtml mcp- reads standard input. --audit needs a key.
--audit and audit_page use VALIDATEHTML_API_KEY. Create one at
https://validatehtml.com/dashboard. A free account includes 100 calls a month;
larger allowances are on the pricing page.
The code or file you ask to check is sent to validatehtml.com, checked in memory
and not stored. A page on localhost is read on your machine and sent the same
way. Only .html, .htm, .css, .json, .xml and .svg files can be read,
up to 1 MB. Each call also counts the tool used and the package version, never
the content.
MIT for this client. The licence does not cover the ValidateHTML name.
This server cannot be deployed
Audit public webpages and supplied markup for HTML, CSS, SEO, JSON-LD, and link issues.
Website checker for AI coding agents. Measures your site in a real browser, with evidence.
Website health, SEO, security-header, SSL and broken-link audits for AI agents.
Run accessibility, contrast, and design token audits and file QA issues from your AI coding tool.
