json - Recursive search values by key -

i have json this:

{    "a": { "error": null },   "b": { "c": {"error": "error string"}},   "c": { "d": {"error": null}},   "d": { "error": "err str"} }

end want find values of error keys not null.

for example should return

"error string" "err str"

how can it? possible jq?

use .. iterate recursively, , .error values. if they're null, remove them:

jq '.. | .error? // empty'

alternatively, instead of using empty can select elements strings strings:

jq '.. | .error? | strings'

Look