{
  "id": "usr_a1b2c3d4",
  "username": "johndoe",
  "email": "john.doe@example.com",
  "profile": {
    "fullName": "John Doe",
    "age": 28,
    "avatar": "https://example.com/avatars/john-doe.jpg"
  },
  "preferences": {
    "theme": "dark",
    "notifications": {
      "email": true,
      "push": true,
      "sms": false
    }
  },
  "roles": ["user", "moderator"],
  "metadata": {
    "createdAt": "2024-01-15T10:30:00Z",
    "lastLogin": "2024-03-15T14:45:00Z",
    "version": "1.0.0"
  }
}