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JQ cheatsheet

15 Feb 2018 | json

Source: Monsanto

Add/change a key to a JSON

function jq_add_key {
  jq --arg key "$2" ". + {\"$1\": \$key}"
}

cat <source>.json | jq --arg key <value> '. + {<key>: $key}'

cat {source}.json | jq_change_key {key} {new_value} > {dest}.json

Modify a key only if exists in a JSON

function jq_change_key {
    jq "to_entries |
        map(if .key == \"$1\"
            then . + {\"value\":\"$2\"}
            else .
            end) |
        from_entries"
}                                      

cat {source}.json | jq_change_key {key} {new_value} > {dest}.json

Caution: do not replace {source}.json as you cat it, it would result in a blank file !

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