Credibility · 22 points
JSON-LD syntax
One check, stated three ways: what we measure, what would make it wrong, and how to confirm it yourself.
What this measures
Whether each application/ld+json block parses as JSON, and how many fail.
Where this check can be wrong
Valid syntax proves nothing about whether the markup is useful or eligible for any rich result — that is Structured data entity and Google's own test. Absent JSON-LD is not a fault here.
Verify it without taking our word for it
Copy each block into any JSON validator, then into the Rich Results Test. Two different questions, two different tools.