Reverse an order of json object keys with values using javascript

Question

let obj = { 
 one : 1, 
 two : 2, 
 three : 3
}

I want output like this :

let obj ={ 
 three: 3, 
 two : 2, 
 one : 1 
}

let keys = Object.keys(obj);
obj = keys.reverse();

there is no guarantee on any order of presentation of keys in a js object, especially when converting JSON to JS object hogs system resources — Mister Jojo, Nov 17 '22 at 19:10
If order is not important, what's the point of the question? — Pointy, Nov 17 '22 at 19:14
I am constructing a new json object via old object so, to make new json object shuffled everytime , I had need this technique — Jerry, Nov 17 '22 at 19:46
You confuse. the word JSON refers to `textual syntax`. **It is not a javascript object**. there is no JSON in your question. — Mister Jojo, Nov 17 '22 at 21:06
Why did you delete your [previous question](/q/74479478/4642212) just to repost it? — Sebastian Simon, Nov 17 '22 at 23:32

score 2 · Answer 1 · answered Nov 17 '22 at 19:06

Use Object.entries to generate an array of [key,value] pairs, then use Object.fromEntries() to convert it back into an object after reversing.

let obj = { 
 one : 1, 
 two : 2, 
 three : 3
}

let output = Object.fromEntries(Object.entries(obj).reverse())

console.log(output)

score 1 · Accepted Answer · answered Nov 17 '22 at 19:03

1

const obj = {
  one : 1, 
 two : 2, 
 three : 3
};

// ️ ['3', '2', '1']
const reversedKeys = Object.keys(obj).reverse();

reversedKeys.forEach(key => {
  console.log(key, obj[key]); 
});

const obj = {
  one : 1, 
 two : 2, 
 three : 3
};

// ️ ['3', '2', '1']
const reversedKeys = Object.keys(obj).reverse();

reversedKeys.forEach(key => {
  console.log(key, obj[key]); 
});

answered Nov 17 '22 at 19:03

Brr Switch

974
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21

Actually `reversedKeys` would yield `['one', 'two', 'three']` – Kinglish Nov 17 '22 at 22:39

Reverse an order of json object keys with values using javascript

2 Answers2