jq

Simple use

echo '[{"username":"user1"},{"username":"user2"}]' | jq '. | length'

echo '[{"username":"user1"},{"username":"user2"}]' | jq '.[] | .username'

Simple use

myjson='[
  {
    "name": "apple",
    "color": "green",
    "price": 1.2
  },
  {
    "name": "banana",
    "color": "yellow",
    "price": 0.5
  },
  {
    "name": "kiwi",
    "color": "green",
    "price": 1.25
  }
]'

echo $myjson | jq '.[] | .name'
  

Merge objects and create array

cat packages.json | jq '.dependencies * .devDependencies | to_entries[]'

Create a csv from package.json

cat ./package.json | jq '.dependencies * .devDependencies | to_entries[] | [.key, .value] | @csv' | sed 's/["\\^]//g' | sed 's/,/@/g'
  