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StructuredValidator

structuredvalidator.com

Free plan Web
Visit structuredvalidator.com
Spec score 7.1 #20 of 24 in Schema Markup Tools

What it is

StructuredValidator is a free web tool for checking structured markup, with validation focused on JSON-LD. Paste JSON-LD or HTML to see results as you type. It detects Microdata and RDFa in pasted HTML, but validates JSON-LD only. Checks cover JSON syntax, contexts, types, property names, value formats, @id references, and required or recommended properties for supported rich-result features. The URL tool fetches public HTTP or HTTPS pages, extracts JSON-LD from server HTML, and validates it in the browser without rendering JavaScript. Fetches allow four redirects, eight seconds, 2 MB per page, and 12 requests per minute per visitor. A comparison view places two schema implementations side by side to show differences, missing properties, and coverage. Rich-result preview and API access are available. Validation history and preferences stay in browser storage, and the service says it does not retain validation data on its servers. Optional AI suggestions send markup and errors to an AI provider under that provider’s retention policy.

Spec sheet

Purpose
StructuredValidator checks JSON-LD markup and explains problems with numbered proof marks, plain-English fixes, and the relevant Google or schema.org rule.Read 3 Oct 2026 · structuredvalidator.com
Audience
The maker describes the tool as intended for SEO professionals and developers.Read 3 Oct 2026 · structuredvalidator.com
Privacy
Validation history and preferences are stored in browser storage, and the privacy policy says validation data is not retained on the service's servers.Read 3 Oct 2026 · structuredvalidator.com
AI data retention
AI request retention follows the AI provider's data retention policy.Read 3 Oct 2026 · structuredvalidator.com
Comparison
The comparison tool shows two schema implementations side by side to identify differences, missing properties, and coverage.Read 3 Oct 2026 · structuredvalidator.com
How to use
Users can paste JSON-LD or HTML for validation, and results appear as they type.Read 3 Oct 2026 · structuredvalidator.com
No account
The privacy policy says the service has no authentication system and does not collect login credentials.Read 3 Oct 2026 · structuredvalidator.com
Optional AI
AI fix suggestions require an explicit user action and send the schema markup and validation errors to an AI provider via Vercel AI Gateway.Read 3 Oct 2026 · structuredvalidator.com
Supported markup
It detects Microdata and RDFa in pasted HTML but validates JSON-LD only.Read 3 Oct 2026 · structuredvalidator.com
URL limits
URL testing accepts public HTTP and HTTPS addresses and limits fetches to four redirects, eight seconds, 2 MB per page, and 12 fetches per minute per visitor.Read 3 Oct 2026 · structuredvalidator.com
URL testing
The URL tool fetches a page's server HTML, extracts JSON-LD blocks, and validates them in the browser without rendering JavaScript.Read 3 Oct 2026 · structuredvalidator.com
Validation checks
It checks JSON syntax, contexts, types, property names, value formats, @id references, and required or recommended properties for supported rich-result features.Read 3 Oct 2026 · structuredvalidator.com

Plans and prices

Free Free Free tool; no signup stated Read 3 Oct 2026 · structuredvalidator.com

Every StructuredValidator plan and price →

Strong points and limits

Strong points

  • Free web-based validation
  • Checks JSON-LD syntax and schema details
  • Validates extracted JSON-LD from URLs
  • Compares two implementations side by side
  • Includes rich-result preview and API access

Limits

  • Only JSON-LD is validated
  • URL checks do not render JavaScript
  • URL fetches have size, time, redirect, and rate limits
  • Optional AI requests follow provider retention policies

Who it suits

It is intended for SEO professionals and developers working with structured data. It suits users who want browser-based validation without an account.

Verdict

StructuredValidator combines live JSON-LD checks, URL extraction, comparison, previews, and API access in a free browser tool. Its limits around markup type, JavaScript rendering, and URL fetches are explicit.

Where Specifiction places it

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