Structured data
Microdata, RDFa and JSON-LD Detector
Paste a page's HTML and see every item of structured data in all three syntaxes, with its type, properties, line number and gaps.
Runs in your browser; nothing is uploaded. · Free, no account · 3 min
Paste the page source. Markup that scripts add after the page loads is only found if you paste the rendered HTML from your browser's inspector.
Importing a saved run into your account is coming soon. Until then, your last runs stay in this browser only, and you can download your files.
How to use
- Paste the page source, or the rendered HTML from your browser's inspector.
- Read the count of items for each syntax: JSON-LD, Microdata and RDFa.
- Fix the warnings: itemprop outside an itemscope, itemscope without a type and old data-vocabulary markup.
- Send each item you want checked in detail to the JSON-LD checker.
What it checks and how it works
Google reads structured data in JSON-LD, Microdata or RDFa and recommends JSON-LD (Google Search Central, intro page, opened on 29 Oct 2026). The tool finds all three in the HTML you paste. JSON-LD blocks are parsed as strict JSON. Microdata follows the HTML Standard's rules for itemscope, itemtype and itemprop, including meta content, link href, time datetime and text values. RDFa follows RDFa Lite 1.1: vocab, prefix, typeof, property, resource and content.
Each item is matched to the Google type it belongs to and its required properties are counted, whichever syntax carried it. The tool flags legacy data-vocabulary.org markup, which Google's breadcrumb page says is no longer eligible for rich result features. It reads only the HTML you paste, so markup that JavaScript adds later appears only if you paste the rendered DOM, and it does not follow itemref links.
Sources
- Google Search Central: Intro to how structured data markup works opened 29 Oct 2026
- WHATWG HTML Standard: Microdata opened 29 Oct 2026
- W3C: RDFa Lite 1.1 opened 29 Oct 2026
- W3C: JSON-LD 1.1 opened 29 Oct 2026
- Google Search Central: Breadcrumb structured data opened 29 Oct 2026
Related tools
JSON-LD Syntax and Required-Property Checker
Paste JSON-LD, or a whole page, and see syntax errors with line numbers plus missing required and recommended properties for each Google type.
JSON-LD Minifier and Prettifier
Indent JSON-LD for reading or compress it for your page, with every number and string copied exactly as written.
Organization Schema Generator
Fill in your organization's details and get JSON-LD that follows Google's Organization structured data page.
Go further with Zaher: See how Zaher's SEO Engine audits technical SEO
Questions
About this tool
JSON-LD. Google's intro page says all three formats are equally fine as long as the markup is valid, but it recommends JSON-LD where your site allows it.
Scripts can add markup after the page loads. Paste the rendered HTML from your browser's inspector to include it.
An older vocabulary. Google's breadcrumb page says markup of that kind is no longer eligible for Google rich result features, so move to schema.org.
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