Glossary · SEO & Search
Schema Markup Validator
Overview
What it checks
The Schema Markup Validator parses the structured data on a page or a code snippet you paste and confirms it follows schema.org rules — correct types, valid properties, and proper nesting. It reports errors (invalid markup) and warnings (missing recommended fields) so you can fix them before publishing, and it supports JSON-LD, Microdata, and RDFa.
Validator vs Google's Rich Results Test
The Schema Markup Validator replaced Google's old Structured Data Testing Tool and is now maintained by the Schema.org community. It validates the entire schema.org vocabulary, whereas Google's Rich Results Test only checks the specific types eligible for Google rich results. Use the validator for general correctness and the Rich Results Test for search-feature eligibility.
Why structured data matters
Clean, valid schema helps search engines and AI answer engines understand your content — powering rich results, knowledge panels, and citations in AI Overviews. In technical SEO and GEO/AEO projects, our team validates every markup block here before launch so structured data actually parses instead of silently failing and forfeiting those placements.
Where we use it
Related Zen in Tech services
How our team puts Schema Markup Validator to work in real projects.
FAQ
Schema Markup Validator — common questions
Is the Schema Markup Validator free?
Yes. It is a free tool hosted at validator.schema.org by the Schema.org community, with no account required. You can test a live URL or paste a code snippet directly.
Schema Markup Validator vs Rich Results Test?
The Schema Markup Validator checks any schema.org markup for correctness across the full vocabulary; Google's Rich Results Test only checks whether markup qualifies for Google's rich result types and shows a preview. Use both — one for validity, one for eligibility.
Why is my valid schema not showing rich results?
Valid markup is necessary but not sufficient. Google decides when to display rich results based on eligibility, content quality, and policy, so schema can pass the validator yet still not appear. Confirm eligibility with the Rich Results Test and Search Console.
Keep exploring
Related terms
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Knowledge hub
From our knowledge hub
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