CSV→JSON

[
  {
    "name": "张三",
    "age": "25",
    "city": "北京"
  },
  {
    "name": "李四",
    "age": "30",
    "city": "上海"
  },
  {
    "name": "王五",
    "age": "28",
    "city": "深圳"
  }
]