StructuredValidator
StructuredValidator is a web tool for checking structured data, with validation focused on JSON-LD.
What StructuredValidator is
StructuredValidator is a web tool for checking structured data, with validation focused on JSON-LD. Paste JSON-LD or HTML to see results as you type. It can identify Microdata and RDFa in pasted HTML, but only JSON-LD is validated. 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 server HTML from public HTTP or HTTPS pages, extracts JSON-LD blocks, and validates them in the browser without rendering JavaScript. Fetches are limited to four redirects, eight seconds, 2 MB per page, and 12 per minute per visitor. A comparison view puts two implementations side by side to reveal differences, missing properties, and coverage. Rich-result preview and API access are also available. The tool is free, with a free plan and no account system. Validation history and preferences are stored in browser storage; optional AI suggestions send markup and errors to an AI provider, whose retention policy applies.
Good
- Validation results appear as you type.
- Checks JSON-LD syntax, references, and properties.
- Compares two schema implementations side by side.
- Includes rich-result preview and API access.
- Free plan; no account system.
Watch out
- Only JSON-LD is validated.
- URL checks do not render JavaScript.
- AI suggestions send markup and errors to a provider.
- URL fetches have size, time, redirect, and rate limits.
Who it suits
It suits SEO professionals and developers who need to check JSON-LD, compare schema implementations, or inspect supported rich-result properties. It is also an option for people who want to validate a page URL without JavaScript rendering.
Verdict
StructuredValidator covers a broad set of JSON-LD checks and offers both pasted-input and URL workflows. Note that URL testing uses server HTML without JavaScript rendering, and optional AI suggestions involve a third-party provider's retention policy.
Plans and prices
From StructuredValidator's own pricing page, checked 3 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | Free tool; no signup stated |
The facts
Each one read from StructuredValidator's own pages, with the date it was checked.
What it does
- AI data retention
- AI request retention follows the AI provider's data retention policy.checked 3 Oct 2026
- Audience
- The maker describes the tool as intended for SEO professionals and developers.checked 3 Oct 2026
- Comparison
- The comparison tool shows two schema implementations side by side to identify differences, missing properties, and coverage.checked 3 Oct 2026
- How to use
- Users can paste JSON-LD or HTML for validation, and results appear as they type.checked 3 Oct 2026
- No account
- The privacy policy says the service has no authentication system and does not collect login credentials.checked 3 Oct 2026
- 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.checked 3 Oct 2026
- 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.checked 3 Oct 2026
- Purpose
- StructuredValidator checks JSON-LD markup and explains problems with numbered proof marks, plain-English fixes, and the relevant Google or schema.org rule.checked 3 Oct 2026
- Supported markup
- It detects Microdata and RDFa in pasted HTML but validates JSON-LD only.checked 3 Oct 2026
- 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.checked 3 Oct 2026
- URL testing
- The URL tool fetches a page's server HTML, extracts JSON-LD blocks, and validates them in the browser without rendering JavaScript.checked 3 Oct 2026
- Validation checks
- It checks JSON syntax, contexts, types, property names, value formats, @id references, and required or recommended properties for supported rich-result features.checked 3 Oct 2026
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