$jsonCount[json;path?]
How many items a list in the JSON text has. Without a path it counts the top level.
Values
json- JSON text, for example from $httpGet.
path- Optional. Where the value is, like data.items.0.name, with numbers for list positions starting at 0.
Example
$jsonCount[$httpGet[https://api.example.com/stats];items]
How many items the answer lists, like 2