以下のJSONをYAMLに変換：

{
  "name": "John",
  "age": 30
}

{
  "database": {
    "host": "localhost",
    "port": 5432,
    "credentials": {
      "username": "admin",
      "password": "secret"
    }
  }
}

database:
  host: localhost
  port: 5432
  credentials:
    username: admin
    password: secret

name,age,city
John,30,Tokyo
Jane,25,Osaka

[
  {"name": "John", "age": 30, "city": "Tokyo"},
  {"name": "Jane", "age": 25, "city": "Osaka"}
]

<user>
  <name>John</name>
  <age>30</age>
  <email>john@example.com</email>
</user>

{
  "user": {
    "name": "John",
    "age": 30,
    "email": "john@example.com"
  }
}