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t0r0X/jq-json-array-length.sh

Last active August 10, 2022 19:26
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Determine JSON array length, handling errors
Raw
jq-json-array-length.sh
# See https://stedolan.github.io/jq/manual/
echo '{}' | jq 'if isempty(. | arrays) then "error" else . | arrays | length end'
# error
echo '[]' | jq 'if isempty(. | arrays) then "error" else . | arrays | length end'
# 0
echo '{}' | jq 'if isempty(. | arrays) then "input not an array"|halt_error(1) else . | arrays | length end'
# input not an array
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