Get value of first object property

Question

I have a simple object that always has one key:value like var obj = {'mykey':'myvalue'}

What is the fastest way and elegant way to get the value without really doing this?

for (key in obj) {
  console.log(obj[key]);
  var value = obj[key];
}

Like can I access the value via index 0 or something?

Please note that the problem has nothing to do with JSON at all. It seems you are confusing JavaScript object literals (constructs of the JavaScript language syntax) with JSON (a language-independent data-exchange format, like XML or CSV). I will edit your question accordingly. See also: There is no such thing as a "JSON object". — Felix Kling
– Felix Kling, Commented Oct 2, 2013 at 13:42
related: JavaScript: Get first and only property name of object — Felix Kling
– Felix Kling, Commented Oct 2, 2013 at 13:46

thefourtheye · Accepted Answer · 2013-10-02 13:58:29Z

25

var value = obj[Object.keys(obj)[0]];

Object.keys is included in javascript 1.8.5. Please check the compatibility here http://kangax.github.io/es5-compat-table/#Object.keys

Edit:

This is also defined in javascript 1.8.5 only.

var value = obj[Object.getOwnPropertyNames(obj)[0]];

Reference:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Working_with_Objects?redirectlocale=en-US&redirectslug=JavaScript%2FGuide%2FWorking_with_Objects#Enumerating_all_properties_of_an_object

edited Oct 2, 2013 at 13:58

answered Oct 2, 2013 at 13:40

thefourtheye

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georg · Accepted Answer · 2013-10-02 14:06:34Z

1

function firstProp(obj) {
    for(var key in obj)
        return obj[key]
}

edited Oct 2, 2013 at 14:06

answered Oct 2, 2013 at 13:46

georg

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Comments

SandroMarques · Accepted Answer · 2021-01-27 23:09:27Z

0

You can use Object.values()

const obj = {
  myKeyA: 'my value A',
  myKeyB: 'my value B',
}

const [valueOfFirstObjectProperty] = Object.values(obj)

console.log('Value:', valueOfFirstObjectProperty) // my value A

edited Jan 27, 2021 at 23:09

answered Jan 27, 2021 at 22:45

SandroMarques

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