jq 1.7 Manual
Array/Object Value Iterator: .[] If you use the .[index] syntax, but omit the index entirely, it will return all of the elements of an array. Running .[] with the input [1,2,3] will produce the numbers as three separate results, rather than as a single array. A filter of the form .foo[] is equivalent to .foo | .[].. You can also use this on an object, and it will return all the values …
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