Structured Data Tools

Structured data tells search engines what a page is about – a product with a price, an event with a date, an article with an author. These tools validate schema.org markup, convert microdata to JSON-LD and generate it from simple forms, all in your browser.

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Tools in this category

Check what you already have

The JSON-LD Validator reads JSON-LD, or a whole HTML page with all its script blocks, microdata and RDFa. It reports JSON syntax errors with line and column, unknown types and properties, values in the wrong format – a sentence where a URL belongs, 31/12/2026 instead of an ISO date, “in stock” instead of InStock – and the properties Google requires for each rich result. Several files can be checked at once.

Convert between syntaxes

Microdata to JSON-LD turns itemscope/itemprop attributes and RDFa Lite into one script block, which is the usual first step when a theme or plugin used inline markup. JSON-LD to Microdata goes the other way for platforms that strip scripts.

Generate markup from a form

Each generator has its own fields, example and checks, and can import existing JSON-LD for editing:

Ratings appear only where Google allows them, and only as fields for reviews that real users left on your page.

Good practice

Mark up what visitors can see on the page, keep prices and dates in sync with the visible text, and use one item per thing described. After publishing, confirm with Google’s Rich Results Test, which renders the live page.

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FAQ

Which format should I use: JSON-LD, microdata or RDFa?

Google supports all three, and recommends JSON-LD because it is kept apart from the visible HTML and is easiest to maintain. Use the converters to move existing microdata or RDFa to JSON-LD.

Does structured data improve rankings?

Not directly. It makes pages eligible for rich results – prices, ratings, event dates, breadcrumbs – which can make a result more useful. Eligibility does not guarantee that Google shows them.

Which rich results does Google no longer show?

How-to (removed in 2023), the sitelinks search box (2024), several features retired in 2025 such as fact checks and special announcements, practice problems (2026) and FAQ (since 7 May 2026). The validator says when markup targets a retired feature.

How do I check a page that is not public yet?

Paste its HTML or JSON-LD into the validator. Nothing is uploaded, so staging and local pages work the same way as live ones.

Where does the vocabulary come from?

From the official schema.org release 30.1, licensed under CC BY-SA 3.0. Google's requirements are taken from its Search Central documentation and dated in each report.

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