jq ist ein Kommandozeilen-Tool zur Verarbeitung und Formatierung von JSON-Daten. Es erlaubt das Filtern, Transformieren und Abfragen von JSON-Strukturen.

=====Daten formatieren=====

<code>
echo '{"name":"Alice","age":25}' | jq .
</code>

<code json>
{
  "name": "Alice",
  "age": 25
}
</code>

=====Mehrstufiges JSON navigieren=====

<code json>
{
  "user": {
    "name": "Alice",
    "details": {
      "age": 25,
      "city": "Berlin"
    }
  }
}
</code>

<code>
echo '{"user":{"name":"Alice","details":{"age":25,"city":"Berlin"}}}' | jq .user.details.city
</code>

<code json>
"Berlin"
</code>

=====Arrays=====

<code json>
[
  {"name": "Alice", "age": 25},
  {"name": "Bob", "age": 30}
]
</code>

<code>
echo '[{"name":"Alice","age":25},{"name":"Bob","age":30}]' | jq '.[0].name'
</code>

<code json>
"Alice"
</code>

<code>
echo '[{"name":"Alice","age":25},{"name":"Bob","age":30}]' | jq '.[].name'
</code>

<code json>
"Alice"
"Bob"
</code>

=====JSON Filtern=====

<code>
echo '[{"name":"Alice","age":25},{"name":"Bob","age":30}]' | jq '[.[] | select(.age > 25)]'
</code>

<code json>
[
  {
    "name": "Bob",
    "age": 30
  }
]
</code>

=====JSON Transforrmieren=====

<code>
echo '[{"name":"Alice","age":25},{"name":"Bob","age":30}]' | jq '[.[] | {name: (.name | ascii_upcase), age}]'
</code>

<code json>
[
  {
    "name": "ALICE",
    "age": 25
  },
  {
    "name": "BOB",
    "age": 30
  }
]
</code>