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Structured Data Validator

Validate JSON-LD structured data against schema.org specs and preview rich snippets.

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JSON-LD or HTML Input
Auto-detects raw JSON-LD vs HTML with embedded script tags

What is Structured Data Validator?

Structured Data Validator is a free, browser-based tool that validates JSON-LD structured data against schema.org specifications and previews how your content may appear as rich snippets in Google search results. It supports 10 common schema types including Article, Product, FAQPage, Recipe, Event, LocalBusiness, Organization, Person, BreadcrumbList, and HowTo. Paste raw JSON-LD or full HTML — the tool auto-detects embedded script tags, checks for required and recommended properties, validates value types, and renders a simulated search result preview. All processing runs entirely in your browser.

Common Use Cases

SEO Audit

Validate structured data on your pages to ensure all required properties are present and correctly formatted before submitting to search engines.

Rich Snippet Debugging

Preview how your JSON-LD will render as a rich snippet in search results to catch display issues before they go live.

Schema Development

Test and iterate on JSON-LD markup during development without leaving your browser or waiting for Google to re-crawl.

Content Migration

Verify structured data integrity when migrating content between CMS platforms or redesigning page templates.

How to Use This Tool

  1. Paste your JSON-LD markup or full HTML page source into the input textarea (or click Load Sample for an example)
  2. Click the Validate button to run all checks against schema.org rules
  3. Review the summary bar showing error, warning, and info counts
  4. Examine each validation message with its property path and severity level
  5. Check the Rich Snippet Preview to see how your data would appear in Google search results

Frequently Asked Questions

Is my data sent to any server?
No. All validation and preview rendering runs entirely in your browser using JavaScript. Your markup never leaves your machine.
What schema types does it support?
The validator includes built-in rules for 10 schema.org types: Article, Product, FAQPage, Recipe, Event, LocalBusiness, Organization, Person, BreadcrumbList, and HowTo. Other types receive generic @context and @type checks.
Can I paste a full HTML page?
Yes. The tool auto-detects whether your input is raw JSON-LD (starts with { or [) or HTML. For HTML input, it extracts all <script type="application/ld+json"> blocks and validates each one.
How accurate is the rich snippet preview?
The preview simulates how Google might render your structured data, but actual search appearance depends on Google’s algorithms, eligibility requirements, and rendering decisions. Use Google’s Rich Results Test for an authoritative check.

Related Tools

Schema Markup Generator → Open Graph Preview → JSON Formatter →

Learn More

Structured Data Validator is a free online tool that requires no signup or installation. It works directly in your browser, keeping your data private and secure.