Structured Data Tools

Validate & Review

The missing APIs for semantic data and rich search results.

play.schemamarkup.app

@type

Product

name

Wireless Headphones

offers

Nested

@type

Offer

availability

in stock now

Unexpected value for "availability" property. Details

price

79.99

priceCurrency

USD

Warning ×7BreadcrumbMerchant listing ×2Product snippet ×2Review snippet

ACME AnvilProductGroup

ACME Anvil - Large×4Merchant listingProduct snippetReview snippetProduct

ACME Anvil - Extra Large×3Merchant listingProduct snippetProduct

May qualify for the Merchant listing feature.

May qualify for the Product snippet feature.

Missing recommended "aggregateRating" property.

Missing recommended "description" property.

Missing recommended "review" property.

UnnamedBreadcrumbBreadcrumbList

Terminal

$ schemamarkup validate -i wireless-headphones.html

@@@ wireless-headphones.html on line 10
ERROR service/schemaorg#UnexpectedPredicateNode

Unexpected value for "availability" property.

  [Details]: https://schema.org/availability

   8 |     <meta property="schema:priceCurrency" content="USD" />
   9 |     <span property="schema:price">79.99</span>
  10 >     <span property="schema:availability">in stock now</span>
                                                ^^^^^^^^^^^^
  11 |   </div>
  12 | </div>

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Highlights

Built for the details that matter.

Free + Scalable: Interactive and programmatic access for free, with paid plans for higher usage.
Unified Validation: Emulates tools like Validator and Rich Results Test for comprehensive results with relevant links.
Standards Compliant: Inspect JSON-LD, RDFa, and other RDF formats with syntax warnings and source attribution.
Automation-friendly: Build with a CLI for scripts, an MCP for agents, and an API for everything else.

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