Structured Data / Schema Tester

Structured Data / Schema Tester fetches a page, extracts every JSON-LD block, validates that each is syntactically valid JSON, and checks for the core required properties of common schema.org types. Whether you’re auditing your own site or a client’s, this page explains the structured data testing tool concept end-to-end and, gives you a free, working free structured data testing tool below.

How it works

Paste a URL. We fetch the HTML, extract every <script type="application/ld+json"> block, attempt to parse each as JSON, and — for recognised @type values (Article, Product, FAQPage, HowTo, Organization, BreadcrumbList, and more) — check for the properties each type requires.

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What we check

• JSON syntax validity per block
• @type recognition
• Presence of required core properties for that type
• Multiple/duplicate schema blocks on one page

How to fix common Structured Data / Schema Tester issues

1. Fix JSON syntax errors (trailing commas, unescaped quotes) — a single error can invalidate the whole block.
2. Add missing required properties (e.g. headline/author/datePublished for Article).
3. Don't mark up content that isn't actually visible on the page — this can trigger a manual action.

FAQs