JSON-LD Schema Checker

What this checker actually validates

This tool runs two layers of checks. First, it confirms the pasted text is valid JSON, catching stray commas, unmatched braces and unquoted keys that would silently break the block on your live page. Second, for common schema.org types, Article, Product, FAQPage, LocalBusiness, Organization, Review, BreadcrumbList and several others, it checks for the specific fields search engines and AI crawlers typically expect to see, flagging anything missing so you can fix it before it goes live.

Syntax errors vs missing fields

A syntax error means the JSON itself cannot be parsed at all, usually a missing closing brace, a trailing comma, or a quote that was not escaped, and it will stop the entire block from being read as structured data. A missing-field warning is different, the JSON is valid, it just does not include a property that is commonly expected for that @type, which can mean your page qualifies for a weaker rich result or none at all rather than failing outright.

Use this alongside Google's own tools

This checker is meant for a fast, offline first pass while you are still writing or editing a schema block. Once it comes back clean, it is still worth running the live URL through Google's Rich Results Test, since Google's own tool checks eligibility for specific rich result types and reflects any additional requirements that change over time.