JSON-LD Checker — Structured Data Validation

JSON-LD checker found a syntax error in my Product schema — a missing comma that was silently breaking the entire structured data block. Google Rich Results Test was showing no errors but this tool caught it.

Nested schema is where most errors happen. The checker validates the full structure including nested entities. I had an author object inside Article schema that was missing required properties.

Always validate after any CMS update or theme change. Plugins often inject schema and overwrite or conflict with your custom JSON-LD.