如何使用JQ从JSON中删除不必要的项？

{
  "name": "John",
  "age": 30,
  "email": "john@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY"
  }
}

jq '{name, email}' input.json

{
  "name": "John",
  "email": "john@example.com"
}

jq 'del(.age)' input.json

{
  "name": "John",
  "email": "john@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York",
    "state": "NY"
  }
}