Free Online Schema Markup Validator

1. Copy the JSON-LD block from your page's <script type="application/ld+json"> tag.
2. Paste it into the input box — the validator parses it as you type.
3. If you see a syntax error, fix the reported issue (often a comma or quote) and re-paste.
4. Check each detected @type for any "missing required" properties and add them.
5. Once everything is green, the markup is syntactically sound and complete for its type.

Structured data is machine-readable markup, usually written as JSON-LD, that describes a page's content using the shared schema.org vocabulary. Search engines read it to power rich results — star ratings, FAQ accordions, recipe cards, event listings and more. JSON-LD must be valid JSON first; a single trailing comma or unquoted key breaks the entire block, so the most common failure is a syntax error rather than a vocabulary mistake.

This validator does a strict two-stage check. First it parses the JSON and reports the exact syntax error if parsing fails. Then, for recognised types — Article, NewsArticle, BlogPosting, Product, FAQPage, Recipe, Event, Organization, LocalBusiness, BreadcrumbList and Person — it confirms the core required properties are filled in (for example Article needs headline, author and datePublished). It walks nested @graph arrays so multi-entity blocks are checked too.

Valid syntax and required fields are necessary but not sufficient for rich results: Google also weighs content quality, eligibility and policy. Use this tool for a fast, private syntax-and-completeness pass — it runs entirely in your browser on the JSON you paste, so unpublished markup never leaves your device. For a fuller property breakdown, use the Structured Data Tester.