Convert array to JSON object using JS

Question

help please with converting array to JSON object

var array = [1, 2, 3, 4]; 
var arrayToString = JSON.stringify(Object.assign({}, array));
var stringToJsonObject = JSON.parse(arrayToString);
 
console.log(stringToJsonObject);

I try this and get:

{0: 1, 1: 2, 2: 3, 3: 4}

Expected result

{place0: 1, place1: 2, place2: 3, place3: 4}

Where's that "place" stuff coming from? And you result looks like a Javascript object, no JSON text involved. — Bergi, Nov 01 '20 at 17:38
Maybe here you can find the answer https://stackoverflow.com/questions/2295496/convert-array-to-json — lissettdm, Nov 01 '20 at 17:40

score 12 · Accepted Answer · answered Nov 01 '20 at 17:40

12

You can do this with .reduce:

var array = [1, 2, 3, 4]; 

var res = array.reduce((acc,item,index) => {
  acc[`place${index}`] = item;
  return acc;
}, {});
 
console.log(res);

answered Nov 01 '20 at 17:40

Majed Badawi

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score 4 · Answer 2 · answered Nov 01 '20 at 17:41

4

var array = [1, 2, 3, 4];
const jsonObj = {}
array.forEach((v,i) => jsonObj['place'+i] = v);
console.log(jsonObj)

answered Nov 01 '20 at 17:41

Sarun UK

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score 0 · Answer 3 · answered Nov 01 '20 at 17:43

0

You can use Object.entries() to get all the array elements as a sequence of keys and values, then use map() to concatenate the keys with place, then finally use Object.fromEntries() to turn that array back into an object.

There's no need to use JSON in the middle.

var array = [1, 2, 3, 4]; 
var object = Object.fromEntries(Object.entries(array).map(([key, value]) => ['place' + key, value]));
console.log(object);

answered Nov 01 '20 at 17:43

Barmar

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1

Just another way to do it. – Barmar Nov 01 '20 at 17:45

score 0 · Answer 4 · answered Nov 01 '20 at 17:44

0

Using for of loop and accumulating into the object

var array = [1, 2, 3, 4];
const result = {}
for (let item of array) {
  result['place' + item] = item;
}
console.log(result)

answered Nov 01 '20 at 17:44

EugenSunic

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Convert array to JSON object using JS

4 Answers4