根据值获取json根密钥

{
  "name": "John",
  "age": 25,
  "email": "john@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York"
  }
}

function findRootKey(jsonData, targetValue) {
  for (const key in jsonData) {
    if (jsonData[key] === targetValue) {
      return key; // 返回找到的密钥
    }
    if (typeof jsonData[key] === 'object') {
      const nestedKey = findRootKey(jsonData[key], targetValue); // 递归遍历嵌套的对象
      if (nestedKey) {
        return key + '.' + nestedKey; // 返回找到的密钥（包括父级密钥）
      }
    }
  }
  return null; // 没有找到匹配的密钥
}

const jsonData = {
  "name": "John",
  "age": 25,
  "email": "john@example.com",
  "address": {
    "street": "123 Main St",
    "city": "New York"
  }
};

const targetValue = "New York";
const rootKey = findRootKey(jsonData, targetValue);
console.log(rootKey); // 输出：address.city