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Catalogue/MCP servers/MCP Web Validator

MCP Web Validator

akzar1el · MCP server

Gives an AI coding assistant checks for web pages. It validates HTML and XHTML files and public URLs with the W3C Nu HTML Checker and CSS files with the W3C Jigsaw CSS Validator, audits titles, descriptions, canonical tags, headings, image alt text and Open Graph metadata, checks JSON-LD syntax, tests links for breakage and captures screenshots at several viewport sizes. The markup or CSS being checked is submitted to those external W3C services.

Written by ooruby from the README of mcp-web-validator 1.3.42.

Not claimed by its maker. Is this yours? Prove it and answer the findings

Why it's useful

Your assistant can check the pages it writes against the W3C validators and SEO checks as you work, so problems are reported during coding.

What you could do with it

  1. 1Validate a local HTML file and get the W3C checker's errors back in the conversation.
  2. 2Audit a page's title, description, canonical tag, headings and image alt text for SEO problems.
  3. 3Check a page's links for broken ones, then capture mobile and desktop screenshots of it.

Written from its documentation: what it says it can do, not what our checks found.

WVMCP serverDeveloper tools

Maintenance

Not measured

No release date is on record for this package yet. The nightly publisher check records one as it reaches each npm package, about once every ten nights.

Release activity only: it says nothing about quality or safety, and a finished small package can be fine without releases. How it is measured

Not yet tested

What this does not cover

  • ·Everything. Treat it as you would software from anywhere else.

Receipt history: every signed receipt for every version of this listing, and what changed between them.

In its maker's words

W3C HTML/CSS Validator and Technical SEO Audit MCP Server for AI coding assistants.

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How far this has been checked

Static scanned

What it establishes
Its published package, or for a hosted server its source repository at a recorded commit, was read file by file, without running it, by every check in our current scan.
What it does not
How it behaves when it runs, or anything the scan does not read yet: several rubric checks, the repository's history, and compiled code in folders named dist or build. For a hosted server, that the endpoint runs the code that was read. The ooruby Index sets out exactly what was read.
Exactly what was read
Version 1.3.42, the file with digest sha512-4JhxHemZgmu6tsgXRqmPjVE/mlpLESYTIICak4zPQkWlqG9ChAKdbaLTo5YnO1IXELNnGPPltdKudjeydeOOeQ==, as the registry publishes it. A published version cannot be replaced, so this names the same bytes for anyone who checks.
Authentication
No auth declared. Its hosted endpoint, as the official MCP registry lists it, does not say it asks for a key. That is what the listing declares, not a finding that it has no protection.
How the rungs work

Adding it

Paste this into your client's MCP configuration.

{
  "mcpServers": {
    "mcp-web-validator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-web-validator@1.3.42"
      ]
    }
  }
}

Or run it directly.

npx -y mcp-web-validator@1.3.42

Pinned to 1.3.42, which is the version the findings above were found in. Drop the version to take whatever is newest, and the report on this page stops describing what you installed.

Where this came from

Registry
npm
Package
mcp-web-validator
Version read
1.3.42
Resolved
2026-10-10
Open the source(opens in a new tab)

Built from source, attested

npm publishes a signed statement that this exact package was built from the repository below, at this commit. It is verifiable without taking our word for it.

Repository
github.com/akzar1el/mcp-web-validator
Commit
cb0a30627434
Built by
github.com/actions/runner/github-hosted
Registry publish attestation
signed by npm · 2026-10-10
Checked
2026-10-10

The badge, if this is your listing

It renders the current rung (static scanned) and links back here, where what that does and does not establish is one click away. It updates itself as the evidence deepens.

[![ooruby: static scanned](https://ooruby.com/api/badge/mcp-web-validator)](https://ooruby.com/market/mcp-web-validator)

About this listing

Kind
MCP server
Category
Developer tools
Pricing
Free
Sandbox
No
Hosted
No
Updated
2026-10-03
Price
Free
Get it freeVisit maker
Rating
no reviews yet
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Verification records what our published tests found on a specific version at a specific date. It is not a warranty, and it does not certify that software is free of defects.