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tldr/pages/common/jello.md
Managor 4b1e0196d1
common/*: reduce usage of "command-line" (part 3) (#16951) 
Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>
Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <wiktor@perskawiec.cc>
2025-06-28 13:12:44 +00:00

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jello

A JSON processor using Python syntax. More information: https://github.com/kellyjonbrazil/jello.

  • Pretty-print JSON or JSON-Lines data from stdin to stdout:

cat {{file.json}} | jello

  • Output a schema of JSON or JSON Lines data from stdin to stdout (useful for grep):

cat {{file.json}} | jello -s

  • Output all elements from arrays (or all the values from objects) in JSON or JSON-Lines data from stdin to stdout:

cat {{file.json}} | jello -l

  • Output the first element in JSON or JSON-Lines data from stdin to stdout:

cat {{file.json}} | jello _[0]

  • Output the value of a given key of each element in JSON or JSON-Lines data from stdin to stdout:

cat {{file.json}} | jello '[i.{{key_name}} for i in _]'

  • Output the value of multiple keys as a new JSON object (assuming the input JSON has the keys key_name1 and key_name2):

cat {{file.json}} | jello '{"{{key1}}": _.{{key_name1}}, "{{key_name}}": _.{{key_name2}}}'

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

cat {{file.json}} | jello -r '"{{some text}}: " + _.{{key_name}}'