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}

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}

• javascript
• json

• 3 Where's that "place" stuff coming from? And you result looks like a Javascript object, no JSON text involved. – Bergi Commented Nov 1, 2020 at 17:38
• 1 Maybe here you can find the answer stackoverflow.com/questions/2295496/convert-array-to-json – lissettdm Commented Nov 1, 2020 at 17:40
• ''place" can obviously be treated as a constant keyword – EugenSunic Commented Nov 1, 2020 at 17:41

4 Answers 4

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);

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

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);

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)