Create a new json string from jq output elements

Question

My jq command returns objects in brackets but without comma separators. But I would like to create a new json string from it.

This call finds all elements of arr

Answer 1

You can always embed a stream of (zero or more) JSON entities within some other JSON structure by decorating the stream, that is, in the present case, by wrapping the STREAM as follows:

{ arr: [ STREAM ] }

In the present case, however, we can also take the view that we are simply editing the original document, and accordingly use a variation of the map(select(...)) idiom:

.arr |= map( select(index("FooItem")) | .[3].texts) 

This latter approach ensures that the context of the "arr" key is preserved.

Addendum

To filter out the empty strings, simply add another map(select(...)):

.arr |= map( select(index("FooItem"))
             | .[3].texts | map(select(length>0)))