期望解码Dictionary <string，any =“”>但是找到了一个数组

Question

这是我的json：

[
  {
    "question": "What is the name of your favorite teacher?",
    "id": "Q1.1",
    "created_at": null,
  },
  {
    "question": "What is the name of your favorite singer?",
    "id": "Q1.2",
    "created_at": null,
  },
  {
    "question": "What is the name of your favorite teacher?",
    "id": "Q1.3",
    "created_at": null,
  }
]

如何使用Codable解析它？我的结构应该是什么？