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Web Validator MCP by DigestSEO

@AKzar1el

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About Web Validator MCP by DigestSEO

W3C HTML/CSS Validator and Technical SEO Audit MCP Server. Part of the DigestSEO (https://digestseo.com) suite.

#seo#html-validator#css-validator#w3c#json-ld#technical-seo#web-validation#accessibility

Config

Add this server to your MCP-compatible client using the configuration below.

{
  "mcpServers": {
    "mcp-web-validator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-web-validator"
      ]
    }
  }
}

Tools

8

Validates a local HTML file against the official W3C Nu HTML Checker API. Catches syntax, tags, and compliance errors.

Validates the markup of a live public URL using the W3C HTML validation engine.

Validates a local CSS file against the W3C Jigsaw CSS Validator API. Finds styling syntax errors.

Runs a fast offline audit of HTML metadata, heading structure, viewport responsive tags, image alt tags, and Open Graph cards.

Extracts all links (a href tags) in the HTML content and tests their HTTP status codes to detect broken internal or external URLs.

Finds and validates the JSON-LD schema blocks within the HTML, catching syntax issues.

Runs all validation checks (HTML, CSS, SEO, Schema, Links) on local files and aggregates them into a beautifully formatted Markdown report with summary tables.

Renders a local HTML file or remote URL using Puppeteer and captures screenshots at different viewport sizes (desktop, tablet, mobile).

Overview

What is Web Validator?

W3C HTML/CSS Validator and Technical SEO Audit MCP Server. Part of the DigestSEO (https://digestseo.com) suite.

How to use Web Validator?

The README includes setup instructions such as "command": "npx",.

Key features of Web Validator

  • HTML Validation: Leverages the official W3C Nu HTML Checker API (no API keys required)
  • CSS Validation: Calls the W3C Jigsaw CSS Validator API to debug stylesheets
  • Broken Link Checker: Scans HTML documents for broken internal or external URLs
  • Schema Validator: Parses and validates embedded JSON-LD structured schemas
  • Arguments: filePath: string (Absolute or relative path to the local HTML file)

Use cases of Web Validator

  • Connect an MCP-compatible client to this repository's service.
  • Review the README-backed setup before enabling it in production.

FAQ from Web Validator

Where is the source code for Web Validator?

The source code is linked from the repository URL on this page.

Does Web Validator include a standard MCP config?

If the README contains a parseable MCP configuration block, it is shown in the Config tab.

Frequently asked questions

Where is the source code for Web Validator?

The source code is linked from the repository URL on this page.

Does Web Validator include a standard MCP config?

If the README contains a parseable MCP configuration block, it is shown in the Config tab.

Comments

Basic information

Category

Developer Tools

License

MIT

Author

AKzar1el

Submitted by

Tommy

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