It would be nice if you could use the FME Server Web UI to also test a topic containing a JSON array, like:
{
"name":"John",
"age":30,
"cars":["Ford", "BMW", "Fiat"]
}.
Currently an error is returned:
Unexpected value "["Ford","BMW","Fiat"]" for message "cars," expected scalar.
The workaround now is to use FME Desktop with a FMEServerNotifier.