Schema Markup Validator
Validate any schema.org markup in JSON-LD, Microdata or RDFa
The Schema Markup Validator, run by schema.org, checks structured data written in JSON-LD, Microdata or RDFa against the schema.org vocabulary. It accepts a URL or a code snippet and shows every item it extracts, with its properties, plus any syntax errors or properties that do not belong to the type.
It replaced Google's older Structured Data Testing Tool, which moved to schema.org. Unlike the Rich Results Test, it does not check eligibility for Google's search features; it checks whether the markup itself is valid schema.org. That makes it the right tool when you use types Google does not show as rich results, or when you want to confirm the structure of your markup before testing it for search features.