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}

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

Answer 1

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);

Answer 2

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

Answer 3

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);

• Barmar: Just another way to do it.

Answer 4

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)