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Schema markup validator

Paste JSON-LD structured data and check it for well-formedness, @context and @type, and the fields each schema type expects.

Paste structured data to check it.

This is a structural check, not the full schema.org vocabulary and not Google's Rich Results Test: it parses each block, reads the @context and @type, and asks whether the common types carry the fields Google documents as required or recommended. It cannot tell you a page will earn a rich result, it does not fetch URLs, and types outside the supported set are listed but not graded.
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Canonical HTML: https://nutter.tools/web/schema-markup-validator
Markdown version: https://nutter.tools/web/schema-markup-validator.md
Plain-text version: https://nutter.tools/web/schema-markup-validator.txt
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