find-key.jq

# This script looks for a particular key anywhere in the JSON and prints its path.
# You have to pass in the key to look for from the command line.
# EXAMPLE: jjq find-key "tag" input_file.json

# Turn the JSON into a list of arrays, each one representing a path
. as $original
|

paths 
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# if the last entry in the path array matches the key we are looking for, print that. 
select(
	.[-1]==$myvar
	)
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# make it look nice first by converting to CSV
@csv
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# prepend some commas to make the rest of this work...
"," + .
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# put brackets around numbers to indicate array indices
gsub("(?<=[\b,])(?<x>[0-9]+)(?=[\b,])";"[\(.x)]")
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# If there are any keys that are pure numbers, put them in single quotes
gsub("\"(?<x>[0-9]+)\"";"'\(.x)'")
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# commas to colons...
gsub(","; ".")
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# remove quotes
gsub("\"";"")
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# bring back the double quotes for keys that are numbers
gsub("'(?<x>[0-9]+)'";"\"\(.x)\"")