JSON-LD, RDFa, Microdata

Structured Data Tools

Developer-friendly validation for rich results and the semantic web.

play.schemamarkup.app

@type

Product

name

Wireless Headphones

offers

Nested

@type

Offer

availability

in stock now

This value is unexpected for an “availability” property.

price

79.99

priceCurrency

USD

~/hugo

$ schemamarkup validate -i public/wireless-headphones.html

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

This value is unexpected for an "availability" property.

   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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Popular Features

Built for the details that matter.

Every layer of structured data work, considered — from the formats you author in to the pipelines that ship them.

Comprehensive Format Support: HTML extraction plus raw JSON-LD, Microdata, and standard RDF formats like TriG and N-Quads.
Search Engine Requirements: Emulates Google's Rich Results Test behaviors against public documentation. Not affiliated with Google.
Native CI/CD Checks: Official GitHub Actions enforce structured data rules on pull requests, keeping staging branches clean.
Docroot Batch Scanning: Recurse through thousands of generated HTML files to catch hidden implementation bugs at scale.
Rigorous Standard Compliance: Bindings analyzed against strict schema.org specifications beyond the basics, securing data fidelity.
Generous Free Tier: Full visual testing on the free tier. Subscription plans unlock higher quotas for programmatic automation.

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