Free structured data check

Structured Data and Schema Markup Checker

Structured data tells search engines and AI assistants what a page is: an article, a product, an organisation, a set of questions. Check that your JSON-LD parses and carries the properties each type needs.

Validate structured data

Enter a page. Every JSON-LD block is parsed and checked.

Checks in this tool:schema.json-ld-valid schema.types-detected schema.required-properties schema.organization schema.breadcrumbs

Why use the Structured Data Checker

Every block parsed

Each script of type application/ld+json is parsed, and a syntax error is reported with the block it is in.

Types listed

All the schema.org types on the page, including the ones nested inside @graph.

Required properties

Common types are checked for the properties search engines require and recommend.

Organisation and breadcrumbs

The entity behind the site and the breadcrumb trail of nested pages are confirmed.

When to use the Structured Data Checker

Rich results

Find missing properties before they cost you a rich result.

Plugin output

SEO plugins emit structured data. Check it is valid and not duplicated.

Product pages

Products need offers with a price and availability.

Articles

Articles need a headline, an author and dates.

Brand identity

An Organization with a logo and sameAs links ties your profiles together.

AI understanding

Clear entities help assistants attribute content correctly.

Understanding Structured Data

What structured data does

Structured data is a machine readable description of the page, written with the schema.org vocabulary. Search engines use it for rich results such as product prices, ratings and breadcrumbs, and to understand entities and their relations.

JSON-LD is the format Google recommends: a script block that stays separate from the visible HTML.

What to mark up

1Organization and WebSite. On the home page, with the name, logo, url and sameAs profiles.
2BreadcrumbList. On nested pages, matching the visible breadcrumbs.
3The main entity. Article, Product, Event, Recipe, LocalBusiness or whatever the page is about.
4FAQPage and HowTo. Only when the content really is a list of questions or steps.

Valid is not eligible

Valid markup does not guarantee a rich result. Search engines decide based on quality and policy, and the marked up content must be visible on the page. Test eligibility for specific results with Google's Rich Results Test.

Privacy, safety and limits

The page is fetched by AbackAuditBot from Aback servers with an ordinary GET request. No cookie, password or form data is sent, and nothing on the site is changed.

The tags are read from the HTML the server sends. Tags that a script adds after the page loads are not seen, and neither are they by most crawlers and preview bots.

Related tools and guides

Schema Markup GeneratorPick a type, fill in the fields and copy valid JSON-LD. The generator includes the properties search engines require and recommend for each type.SEO CheckerFind the technical problems that keep a page out of search results. The checker reads the page the way a search crawler does and lists what to fix first, with the evidence behind every verdict.AI Search Readiness CheckerGenerative engine optimization starts with access. Check that AI assistants can crawl your pages, receive the real content rather than a block page, and read it without running JavaScript.Meta Tag CheckerSee the title and description a search engine reads, how the result could look, and whether the canonical, robots, viewport and language tags are set correctly.Open Graph CheckerWhen someone shares your page, the preview comes from its Open Graph and Twitter card tags. Check that they are complete and see a preview of the card.Heading CheckerHeadings are the outline of a page for screen readers, search engines and AI assistants. See the outline of any page and fix skipped levels, empty headings and missing or duplicate H1s.Guide: Structured data guideWhat structured data does, which schema.org types to use on which pages, how to write valid JSON-LD, and the mistakes that cost rich results.

Frequently asked questions

JSON-LD, Microdata or RDFa?

JSON-LD. Google recommends it, it is easier to maintain, and it does not tangle with the visible HTML. This checker reads JSON-LD.

Does structured data improve rankings?

Not directly. It enables rich results, which can improve clicks, and helps search engines and assistants understand the page.

Why is a required property missing?

Your template or plugin does not output it. The finding names the type and the property so you can add it.

Can I have several JSON-LD blocks?

Yes. Several blocks or one @graph both work. Avoid describing the same entity twice with conflicting values.

Is FAQ markup still useful?

Google shows FAQ rich results only for a small set of authoritative sites now. The markup is still valid and still describes the page.

Does this replace Google's Rich Results Test?

No. Use both. This checker validates syntax and properties and fits into a full audit. The Rich Results Test shows Google's eligibility decision.

Is there a generator?

Yes. The schema markup generator writes JSON-LD for Organization, WebSite, Article, Product, LocalBusiness, FAQPage and BreadcrumbList.