Structured-data test page
Why this page exists
Structured data is easy to break with a single misplaced character. This page carries two JSON-LD blocks. The first is valid. The second contains a trailing comma, which makes it invalid JSON, so no parser should accept it.
What a correct result looks like
The observation records exactly one parsed structured-data object and exactly one block that could not be parsed. It must not guess what the broken block meant.