如何遍历MarkLogic中的JSON对象以将所有键推入数组中？

Question

I have a multi level JSON like in the example below. I want to write a simple code to loop through it and fetch all the keys there are in it for validation purposes.

I tried Object.keys() but that gives the keys only for the first level of the object. How do I loop it to get the whole result?

{
"id": "0001",
"ppu": 0.55,
"batters": {
    "batter": [{
            "id": "1001",
            "type": "Regular"
        },
        {
            "id": "1004",
            "type": "Devil's Food"
        }
    ]
},
"topping": {
    "id": "5001",
    "type": "None",
    "moreData": {
        "id": "5003",
        "type1": "Chocolate",
        "type2": {
            "id": "5004",
            "type": "Maple"
        }
    }
  }
}

I normally get only the first keys, ie "id", "ppu","batters",topping" but I want all the keys including "batter", "type", "moreData", etc. NOTE: All my keys are unique unlike the example below.

EDIT - Code that I'm trying:

function keyCheck(obj) {
    var a = Object.keys(obj);
    var arr=[];
    arr.push(a);
    for (var i = 0; i < a.length; i++) {
        var b = obj[a[i]];
        if (typeof (b) == 'object') {
            keyCheck(b);
        }   
    }    
    return arr[0];
}
keyCheck(obj);

Answer 1

You can write a recursive method as follows,

 let obj = { "id": "0001", "ppu": 0.55, "batters": { "batter": [{ "id": "1001", "type": "Regular" }, { "id": "1004", "type": "Devil's Food" } ] }, "topping": { "id": "5001", "type": "None", "moreData": { "id": "5003", "type1": "Chocolate", "type2": { "id": "5004", "type": "Maple" } } } } function getKeys(obj, arr = []) { Object.entries(obj).forEach(([key, value]) => { if(typeof value === 'object' && !Array.isArray(value)) { arr.push(key); getKeys(value, arr); } else { arr.push(key); } }); return arr; } console.log(getKeys(obj)); 

For old browsers

function getKeys(obj, arr = []) {
    Object.entries(obj).forEach(function(entry) {
        let key = entry[0];
        let value = entry[1]
        if(typeof value === 'object' && !Array.isArray(value)) {
            arr.push(key);
            getKeys(value, arr);
        } else {
            arr.push(key);
        }
    });
    return arr;
}

Answer 2

You can achieve this with making a recursive function with Object.keys()

  const object = { id: '0001', ppu: 0.55, batters: { batter: [{ id: '1001', type: 'Regular', }, { id: '1004', type: "Devil's Food", }, ], }, topping: { id: '5001', type: 'None', moreData: { id: '5003', type1: 'Chocolate', type2: { id: '5004', type: 'Maple', }, }, }, }; function getKeyNames(obj, secondObj) { Object.keys(obj).forEach((r) => { const elem = obj[r]; const refObj = secondObj; if (!Array.isArray(elem)) { refObj[r] = r; } if (typeof elem === 'object' && (!Array.isArray(elem))) { getKeyNames(elem, secondObj); } }); return secondObj; } function getAllKeys(obj) { const secondObj = {}; const keys = getKeyNames(obj, secondObj); return Object.keys(keys); } const result = getAllKeys(object); console.log(result); 

Answer 3

You can use a recursive function to get all the keys. Below method takes a second argument unique that lets you set if keys should be duplicated in your resulting array of keys.

 const allKeys = (obj, unique = true) => { const res = Object.entries(obj).flatMap(([k, v]) => { if (typeof v === 'object') { if (Array.isArray(v)) return [k, v.flatMap(vv => allKeys(vv, unique))].flat(); return [k, allKeys(v, unique)].flat(); } return k; }); return unique ? [...new Set(res)] : res; }; console.log(allKeys(obj)); 

 <script> const obj = { "id": "0001", "ppu": 0.55, "batters": { "batter": [{ "id": "1001", "type": "Regular" }, { "id": "1004", "type": "Devil's Food" } ] }, "topping": { "id": "5001", "type": "None", "moreData": { "id": "5003", "type1": "Chocolate", "type2": { "id": "5004", "type": "Maple" } } } }; </script> 

Answer 4

The JSON.parse reviver parameter can be used to get all key value pairs :

 var keys = {}, json = '{"id":"0001","ppu":0.55,"batters":{"batter":[{"id":"1001","type":"Regular"},{"id":"1004","type":"Devil\\'s Food"}]},"topping":{"id":"5001","type":"None","moreData":{"id":"5003","type1":"Chocolate","type2":{"id":"5004","type":"Maple"}}}}' JSON.parse(json, function(key, value) { if ( isNaN(key) ) keys[key] = value }) console.log( Object.keys(keys) ) 

Answer 5

So I figured out a solution by using the inputs provided by everyone here.Due to some policy I cannot post my own solution but this is what I did: Get Object.keys() for first level data. Check if it's another object or array & call the same function recursively. If not then add it to the array.