Some quick JQ scribbles

Posted on April 9, 2022 by vhs
Tags: jq, bash

quick scribles to remember jq usage

  • identity cat <file> | jq '.'
  • property access cat <file> | jq '<name of property>'
  • combine two filters with | cat <file> | jq '. | .foo'
  • provide 2 outputs with “,” cat <file> | jq '. , .foo'
  • when mapping, “.” is considered each value, use map for array mapValues for objects

example

#! /usr/bin/env sh

cat ./storage.json | jq '.' | jq '.favorites' \
  | jq 'map({"id": ., "with20delay": false, "with30delay": false})' | jq '{favorites: .}'

Map a value with point-free style

#! /usr/bin/env sh

cat ./storage.json | jq '.favorites' | jq 'map(.rate |= tonumber)'