SEO
Schema Markup Validator
Schema Markup Validator is the community tool for checking structured data syntax and usage of the Schema vocabulary on a webpage or code snippet. It parses formats such as JSON-LD, Microdata, and RDFa, then reports detected entities and vocabulary-related errors, but it does not determine eligibility for Google-specific search features. It is best for developers and SEO specialists validating general markup, while Google's Rich Results Test remains the appropriate companion for supported Google rich result requirements and previews.
What it does
Schema Markup Validator is Google's official tool (at validator.schema.org) for testing JSON-LD, Microdata, and RDFa structured data on any URL or code snippet. It parses and validates structured data against the Schema.org vocabulary, reporting errors (malformed JSON, missing required properties) and warnings (missing recommended properties). It replaced the older Structured Data Testing Tool and does not show rich result eligibility — for that, Google's Rich Results Test (which checks a subset of types eligible for rich results in Search) is the companion tool. Both are free, require no account, and are essential steps before deploying structured data on a live site.
Where it fits
Schema Markup Validator is a QA tool used after writing structured data and before (or during debugging of) live deployment — it confirms the markup is syntactically and semantically correct.
Core features
- Validates JSON-LD, Microdata, and RDFa against the full Schema.org vocabulary
- URL and code snippet testing without requiring site access or authentication
- Error and warning breakdown by schema type and property
- Visual tree view of parsed schema entities and their relationships
- Free, no account required
Best for
- SEOs and developers validating JSON-LD before deploying to a live page
- Site owners troubleshooting why structured data is not producing rich results in Google Search
- QA workflows that need a quick check of any live URL's schema implementation
Beginner notes
- This tool validates against Schema.org — passing here does not guarantee rich results. Run Google's Rich Results Test separately to confirm eligibility for the specific rich result types you want.
- Errors block structured data from being processed; warnings indicate missing recommended (not required) properties and may limit rich result features.
- Test the live URL, not just a code snippet, so you catch any discrepancy between what your CMS generates and what you intended to deploy.