Web Validator MCP by DigestSEO
About
W3C HTML/CSS Validator and Technical SEO Audit MCP Server. Part of the DigestSEO (https://digestseo.com) suite.
Details
- Author
- AKzar1el
- GitHub stars
- 1
- Downloads
- 371
- Categories
- Developer Tools
Jump to
- 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)
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Web Validator MCP by DigestSEOCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
The README includes setup instructions such as "command": "npx",.
html_validate_local
Validates a local HTML file against the official W3C Nu HTML Checker API. Catches syntax, tags, and compliance errors.
html_validate_url
Validates the markup of a live public URL using the W3C HTML validation engine.
css_validate_local
Validates a local CSS file against the W3C Jigsaw CSS Validator API. Finds styling syntax errors.
seo_audit_metadata
Runs a fast offline audit of HTML metadata, heading structure, viewport responsive tags, image alt tags, and Open Graph cards.
links_check_broken
Extracts all links (a href tags) in the HTML content and tests their HTTP status codes to detect broken internal or external URLs.
schema_validate_markup
Finds and validates the JSON-LD schema blocks within the HTML, catching syntax issues.
report_generate_validation
Runs all validation checks (HTML, CSS, SEO, Schema, Links) on local files and aggregates them into a beautifully formatted Markdown report with summary tables.
screenshot_capture
Renders a local HTML file or remote URL using Puppeteer and captures screenshots at different viewport sizes (desktop, tablet, mobile).
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"web validator mcp by digestseo": {
"mcp-web-validator": {
"command": "npx",
"args": [
"-y",
"mcp-web-validator"
]
}
}
}
}McpServers
{
"mcp-web-validator": {
"command": "npx",
"args": [
"-y",
"mcp-web-validator"
]
}
}W3C HTML/CSS Validator and Technical SEO Audit MCP Server. Part of the DigestSEO (https://digestseo.com) suite.
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