Structured data is machine-readable markup, usually written in schema.org vocabulary, that tells search engines exactly what your content means: that this is a Product with a price and rating, that this is an FAQ, or that these are the steps in a recipe. When search engines understand your markup, they can display rich results such as star ratings, FAQ accordions, breadcrumbs, and sitelinks, which make your listing stand out and improve click-through rates. This validator fetches any public page and extracts its structured data three ways: JSON-LD (the format Google recommends), Microdata, and RDFa. It then checks each detected type against the properties Google's rich-results guidance considers required and recommended, so you can spot missing fields before they cost you a rich result.
Enter the full URL of the page you want to check and click Validate. The tool downloads the page and scans it for JSON-LD script blocks, Microdata itemscope elements, and RDFa attributes. For each block found it shows the format, the detected schema.org type, a pretty-printed view of the data, and a checklist marking each required or recommended property as present (green) or missing (amber). If a JSON-LD block has a syntax error, the exact JSON parse error is reported so you can fix it. A summary at the top lists how many structured-data blocks were found and which types they use.
JSON-LD is the format Google recommends. If you are adding structured data for the first time, use JSON-LD rather than Microdata or RDFa. Common rich-result requirements to watch for: Product needs a name plus offers, review, or aggregateRating; Article and BlogPosting need a headline, image, and datePublished; FAQPage needs a mainEntity list of Question items each with an acceptedAnswer; BreadcrumbList needs itemListElement entries. This tool is a fast heuristic pre-check that catches the most common mistakes, but it is not a full schema.org engine. Always run the same URL through Google's Rich Results Test for authoritative, eligibility-level validation before you rely on a rich result appearing.
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