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

Submitted by: @import:tldr-pages·Mar 2, 2026·

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Problem

How to use the jello command: A JSON processor using Python syntax. More information: <https://github.com/kellyjonbrazil/jello#usage>.

Solution

jello — A JSON processor using Python syntax. More information: <https://github.com/kellyjonbrazil/jello#usage>.

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, "key2": _.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}}'

Code Snippets

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 _]'

Context

tldr-pages: common/jello

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