遍历 JSON 中具有相同属性的未知标识符（和未知数量）

Question

我正在使用 node.js 来编程。

这是一个 JSON 我将收到的简化示例：

{
  "Transaction ID213": {
    "drink": "milk",
    "food": "eggs",
    "mealType": "breakfast"
  },
  "Transaction ID432": {
    "drink": "beer",
    "food": "steak",
    "mealType": "brunch"
  },
  "Transaction ID908": {
    "drink": "water",
    "food": "tacos",
    "mealType": "dinner"
  },
  "Transaction ID776": {
    "drink": "orange juice",
    "food": "waffles",
    "mealType": "breakfast"
  }
}

我知道每个交易 ID 中的所有属性键。然而，我 will/do 不知道交易 ID 或我将收到多少个对象 (id)。示例中有 4 个对象 ID。最多可能有 20,000 人进入，也可能只有 1 人。数量未知。

对于每个交易 ID，我会将每个键的值发布到 api。我正在将该值映射到另一种 JSON 格式。例如：

{
  "PROCESS_MEAL_Input": {
    "LIQUID": TransactionID213.drink,
    "SOLID": TransactionID213.food,
    "TYPE": TransactionID213.mealType
  }
}

我无法知道 TransactionID213，但我知道其中的密钥。

我想知道是否有办法使用 for 循环或其他循环结构来获取第一个对象（未知的 TransactionID213），POST 其中的属性，然后移动到下一个目的。继续此过程，直到 JSON 中不再有对象。谢谢。

Answer 1

也许您需要这样的东西？

var obj = {
  "Transaction ID213": {
    drink: "milk",
    food: "eggs",
    mealType: "breakfast"
  },
  "Transaction ID432": {
    drink: "beer",
    food: "steak",
    mealType: "brunch"
  },
  "Transaction ID776": {
    drink: "water",
    food: "tacos",
    mealType: "dinner"
  },
  "Transaction ID777": {
    drink: "orange juice",
    food: "waffles",
    mealType: "breakfast"
  }
};

var arr = [];

for (let p in obj) {      
  let newObj = {
    PROCESS_MEAL_Input: {
      LIQUID: obj[p].drink,
      SOLID: obj[p].food,
      TYPE: obj[p].mealType
    }
  };
 //POST here.   http.request(.... Or something
  arr.push(newObj);
}

console.log(arr);

Answer 2

可能这样的事情会有所帮助：-

var jsonObject = 
{
"Transaction ID213":
{
"drink": "milk",
"food": "eggs",
"mealType": "breakfast"
},
"Transaction ID432":
{
"drink": "beer",
"food": "steak",
"mealType": "brunch"
},
"Transaction ID776":
{
"drink": "water",
"food": "tacos",
"mealType": "dinner"
},
"Transaction ID776":
{
"drink": "orange juice",
"food": "waffles",
"mealType": "breakfast"
}
}

var userStr = JSON.stringify(jsonObject);

var ans = JSON.parse(userStr, (key, value) => {
  if (typeof value === 'string') {
    return value
  }
  return value;
});

console.log(ans);

希望对您有所帮助！

遍历 JSON 中具有相同属性的未知标识符（和未知数量）

Looping through unknown identifiers (and unknown amount) in JSON with same attributes inside

json

for-loop

key-value

node.js