Web Validator by DigestSEO

akzar1el/mcp-web-validator

Audit public webpages and supplied markup for HTML, CSS, SEO, JSON-LD, and link issues.

GitHub stars: 9
tools: 8
transport: STDIO, HTTP
last updated: Nov 11, 2026

View on GitHub

Install

From registry metadata

$ npx add-mcp https://web-validator-mcp.digestseo.com/mcp --name mcp-web-validator

Run in your terminal. add-mcp asks which agents to add it to (Claude Code, Codex, Cursor and more). Add -g to install it for every project.

Review the command, arguments and environment values before installing. MCP servers run with your local permissions.

Other ways

Claude Code

$ claude mcp add --transport http mcp-web-validator https://web-validator-mcp.digestseo.com/mcp

Run in your terminal. Add --scope user to make it available in every project.

Tools

Verified live · 8 tools

Verified live against the running server on Nov 6, 2026.

validate_htmlUse this when raw HTML markup is supplied. Sends that markup to the Nu HTML Checker hosted at validator.nu and returns validation messages. For a live URL, use audit_public_webpage.1 params

Use this when raw HTML markup is supplied. Sends that markup to the Nu HTML Checker hosted at validator.nu and returns validation messages. For a live URL, use audit_public_webpage.

Parameters* required

html*string

Raw HTML markup supplied by the user; this is not a webpage URL.

validate_cssUse this when raw CSS source is supplied. Parses it inside the Worker and returns syntax messages without contacting an external service.1 params

Use this when raw CSS source is supplied. Parses it inside the Worker and returns syntax messages without contacting an external service.

Parameters* required

css*string

Raw CSS source supplied by the user.

audit_seo_metadataUse this for a focused SEO/accessibility-signal check of supplied HTML. It does not fetch a live webpage; use audit_public_webpage for a URL.1 params

Use this for a focused SEO/accessibility-signal check of supplied HTML. It does not fetch a live webpage; use audit_public_webpage for a URL.

Parameters* required

html*string

Raw HTML markup supplied by the user; this is not a webpage URL.

validate_schema_markupUse this for a focused JSON-LD syntax check of supplied HTML. It parses JSON only and does not validate Schema.org vocabulary semantics.1 params

Use this for a focused JSON-LD syntax check of supplied HTML. It parses JSON only and does not validate Schema.org vocabulary semantics.

Parameters* required

html*string

Raw HTML markup supplied by the user; this is not a webpage URL.

check_broken_linksUse this for a focused check of up to 20 public HTTP(S) links found in supplied HTML. It does not fetch base_url, follow redirects, or retain response bodies.3 params

Use this for a focused check of up to 20 public HTTP(S) links found in supplied HTML. It does not fetch base_url, follow redirects, or retain response bodies.

Parameters* required

base_urlstring

Only resolves relative links; it does not fetch this webpage.

html*string

Raw HTML markup supplied by the user; this is not a webpage URL.

max_linksinteger

Maximum links to check, from 1 to 20.default: 15

generate_validation_reportUse this when HTML markup is already supplied. Combines Nu HTML validation with local CSS, SEO, accessibility-signal, and JSON-LD syntax checks. It does not fetch a webpage from base_url; use audit_public_webpage for a live URL.5 params

Use this when HTML markup is already supplied. Combines Nu HTML validation with local CSS, SEO, accessibility-signal, and JSON-LD syntax checks. It does not fetch a webpage from base_url; use audit_public_webpage for a live URL.

Parameters* required

base_urlstring

Only resolves relative links when check_links is true; it does not fetch this webpage.

check_linksboolean

Whether to contact eligible public links found in the supplied HTML.default: false

cssstring

Optional raw CSS source. Linked stylesheets are not fetched.

html*string

Raw HTML markup supplied by the user; this is not a webpage URL.

max_linksinteger

Maximum links to check, from 1 to 20.default: 15

audit_public_webpageUse this when the user provides one live public webpage URL. Fetches one bounded static HTML response, then runs HTML validation, SEO/accessibility-signal, and JSON-LD syntax checks. It checks links only when requested and does not crawl, execute JavaScript, authenticate, or f...3 params

Use this when the user provides one live public webpage URL. Fetches one bounded static HTML response, then runs HTML validation, SEO/accessibility-signal, and JSON-LD syntax checks. It checks links only when requested and does not crawl, execute JavaScript, authenticate, or f...

Parameters* required

check_linksboolean

Whether to contact eligible public links found on the fetched page.default: false

max_linksinteger

Maximum links to check, from 1 to 20.default: 15

url*string

One authorized public HTTP(S) webpage URL; private pages, credentials, and custom ports are rejected.

audit_public_siteUse this for a bounded, sitemap-first audit of a public website the user owns or is authorized to inspect. It fetches at most 8 same-origin HTML pages per call, respects robots.txt, and returns compact page summaries plus deduplicated findings. It does not recursively follow H...3 params

Use this for a bounded, sitemap-first audit of a public website the user owns or is authorized to inspect. It fetches at most 8 same-origin HTML pages per call, respects robots.txt, and returns compact page summaries plus deduplicated findings. It does not recursively follow H...

Parameters* required

max_pagesinteger

Maximum same-origin pages to audit in this call, from 1 to 8.default: 5

page_offsetinteger

Zero-based sitemap-page offset for continuing a capped audit batch.default: 0

site_url*string

Authorized public website URL. The final public origin becomes the crawl boundary.

Readme

Web Validator by DigestSEO

An MCP server for HTML and CSS validation, technical SEO and accessibility checks, JSON-LD syntax validation, broken-link checks, and responsive screenshots. It is part of the DigestSEO suite of open-source SEO tools.

View the full README on GitHub

Details

Repository: github.com/akzar1el/mcp-web-validator
Website: digestseo.com/validator-mcp
Categories: Sales & Marketing, Data & Analytics
Package: mcp-web-validator
Transport: STDIO, HTTP
Registry: MCP registry, active
Resources: 1
Tools verified: Nov 6, 2026

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