JSON 포맷터 및 유효성 검사기

{
  "user": {
    "id": 12345,
    "username": "johndoe",
    "email": "john.doe@example.com",
    "profile": {
      "firstName": "John",
      "lastName": "Doe",
      "avatar": "https://example.com/avatar.jpg",
      "bio": "Software developer and coffee enthusiast"
    },
    "settings": {
      "notifications": true,
      "theme": "dark",
      "language": "en"
    },
    "roles": [
      "user",
      "moderator"
    ],
    "metadata": {
      "createdAt": "2024-01-15T10:30:00Z",
      "lastLogin": "2026-09-17T14:22:00Z",
      "loginCount": 847
    }
  },
  "success": true,
  "timestamp": "2026-09-17T14:22:35Z"
}