Schema Markup Validator

Schema Markup Validator is the official structured data validation tool maintained by schema.org. It was originally Google's Structured Data Testing Tool (SDTT), which Google migrated to schema.org in April 2021 as a generic schema syntax validator.

Key Features

• URL Validation: Enter any webpage URL to have the tool fetch and parse all structured data on the page
• Code Validation: Paste HTML snippets or raw JSON-LD code for instant validation
• Multi-format Support: Fully supports JSON-LD, Microdata, and RDFa structured data formats
• Full Schema.org Coverage: Validates all types defined in the schema.org vocabulary, not limited to Google's supported rich result subset
• Precise Error Reporting: Pinpoints missing fields, type mismatches, and non-compliant properties
• Multilingual Interface: Available in 30+ languages including Simplified and Traditional Chinese

How It Differs from Google Rich Results Test

The Schema Markup Validator focuses on syntactic correctness against schema.org standards and covers all schema.org types; while the Google Rich Results Test focuses specifically on eligibility for rich result features in Google Search. The two tools are complementary and best used together.

Who Should Use It

• Developers: Debug complex schema structures and confirm markup validity
• SEO Engineers: Comprehensively validate structured data beyond what Google's rich results tool covers
• Content Platforms: Audit structured data quality across page templates at scale