jq

A command-line JSON processor that uses a domain-specific language.

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• Output a JSON file, in pretty-print format:

jq . {file.json}

• Output all elements from arrays (or all the values from objects) in a JSON file:

jq '.[]' {file.json}

• Output elements from arrays which match provided filter:

jq '.[] | select(.{key_name} == {value})'

• Read JSON objects from a file into an array, and output it (inverse of jq .[]):

jq --slurp . {file.json}

• Output the first element in a JSON file:

jq '.[0]' {file.json}

• Output the value of a given key of each element in a JSON text from stdin:

cat {file.json} | jq 'map(.{key_name})'

• Output the value of multiple keys as a new JSON object (assuming the input JSON has the keys key_name and other_key_name):

cat {file.json} | jq '{{my_new_key}: .{key_name}, {my_other_key}: .{other_key_name}}'

• Output the value of a given key to a string (and disable JSON output):

cat {file.json} | jq --raw-output '"some text: \(.{key_name})"'

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