How to add variable as json key in javaScript

Question

I have a json object with key value pair. I want to add a variable as key but i dont know how to add. I tried with some code but it dosen't set the variable value. How can i solve this?

var id='second'
var obj={'first': 123, id: 23}
console.log(obj); //{first: 123, id: 23}

But i want to be the result like this.

{first: 123, second: 23}

Please help me to fix this problem. Thankyou

Possible duplicate of JavaScript set object key by variable and literally hundreds of others — JJJ
– JJJ, Commented Nov 22, 2017 at 17:46
You don't have a "JSON object". See What is the difference between JSON and Object Literal Notation? — JJJ
– JJJ, Commented Nov 22, 2017 at 17:47

Gamsh · Accepted Answer · 2017-11-22 18:02:25Z

11

Try this one. This is works.

id='second'
var obj={'first': 123,[id]: 23}

answered Nov 22, 2017 at 18:02

Gamsh

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CRice · Accepted Answer · 2017-11-22 17:56:30Z

10

If you have built the object already, you can add the property by

obj[id] = 23

If you have not built the object and are putting it together at that moment:

var obj = {
    first: 123,
    [id]: 23
}

answered Nov 22, 2017 at 17:56

CRice

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Comments

Marek · Accepted Answer · 2017-11-22 17:48:00Z

2

This one is simple:

obj[id]=123;

answered Nov 22, 2017 at 17:48

Marek

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2 Comments

giththan giththan Over a year ago

its chows the result like {first: 123, id: 23, second: 123} but i want with out ` id: 23` in a efficient way

Marek Over a year ago

I am not sure what exactly are you trying to do. So you want to change id: 23 to second: 123? Then add delete obj["id"]; before

sofalse · Accepted Answer · 2017-11-22 17:47:53Z

1

Try:

obj[id] = 23

It'll add a key named by the value of variable id and set its value to 23.

answered Nov 22, 2017 at 17:47

sofalse

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