mirror of https://github.com/CrimsonTome/tldr.git
37 lines
971 B
Markdown
37 lines
971 B
Markdown
# jq
|
|
|
|
> A lightweight and flexible command-line JSON processor.
|
|
> More information: <https://stedolan.github.io/jq>.
|
|
|
|
- Output a JSON file, in pretty-print format:
|
|
|
|
`jq . {{file.json}}`
|
|
|
|
- Output all elements from arrays (or all key-value pairs from objects) in a JSON file:
|
|
|
|
`jq '.[]' {{file.json}}`
|
|
|
|
- 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 the first element in a JSON text from `stdin`:
|
|
|
|
`cat {{file.json}} | jq '.[0].{{key_name}}'`
|
|
|
|
- Output the value of a given key of each element in a JSON text from `stdin`:
|
|
|
|
`cat {{file.json}} | jq 'map(.{{key_name}})'`
|
|
|
|
- Combine multiple filters:
|
|
|
|
`cat {{file.json}} | jq 'unique | sort | reverse'`
|
|
|
|
- Output the value of a given key to a string (and disable JSON output):
|
|
|
|
`cat {{file.json}} | jq --raw-output '"some text: \(.{{key_name}})"'`
|