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StructuredValidator
What it is
StructuredValidator is a web tool for checking structured markup, 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 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 the server HTML, and validates it 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 places two implementations side by side to show differences, missing properties, and coverage. Rich-result preview and API access are also available. It is free, runs on the web, and has no authentication system. Validation history and preferences are kept in browser storage. Optional AI fix suggestions are user-initiated and send markup and errors to an AI provider; that provider's retention policy applies.
For and against
For
- Shows numbered proof marks and plain-English fixes.
- Checks required and recommended rich-result properties.
- Compares two schema implementations side by side.
- Includes rich-result preview and API access.
Against
- Validates JSON-LD only, not Microdata or RDFa.
- URL checks do not render JavaScript.
- AI suggestions send markup and errors to an AI provider.
The verdict
StructuredValidator combines in-browser JSON-LD checks with URL validation, comparison, and rich-result preview. Its markup validation is limited to JSON-LD, and optional AI suggestions send the schema and errors to an outside provider.
Who it suits
It suits SEO professionals and developers checking JSON-LD or comparing schema implementations. It may also help people who want to validate a page's server HTML without JavaScript rendering.
Plans and prices
Free
Free tool; no signup stated
Read 3 Oct 2026 · structuredvalidator.com
On the record
- AI data retention
- AI request retention follows the AI provider's data retention policy.structuredvalidator.com · read 3 Oct 2026
- Audience
- The maker describes the tool as intended for SEO professionals and developers.structuredvalidator.com · read 3 Oct 2026
- Comparison
- The comparison tool shows two schema implementations side by side to identify differences, missing properties, and coverage.structuredvalidator.com · read 3 Oct 2026
- How to use
- Users can paste JSON-LD or HTML for validation, and results appear as they type.structuredvalidator.com · read 3 Oct 2026
- No account
- The privacy policy says the service has no authentication system and does not collect login credentials.structuredvalidator.com · read 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.structuredvalidator.com · read 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.structuredvalidator.com · read 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.structuredvalidator.com · read 3 Oct 2026
- Supported markup
- It detects Microdata and RDFa in pasted HTML but validates JSON-LD only.structuredvalidator.com · read 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.structuredvalidator.com · read 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.structuredvalidator.com · read 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.structuredvalidator.com · read 3 Oct 2026
