JS object keys with or without quotes?

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What is the difference between object keys with quotes and without quotes?

Is interest, what is right way, write object keys in quotes or not? that is

var obj = {
    "name": "Jhon"
}

or

var obj = {
    name: "Jhon"
}

for example, from php code echo json_encode(array("a"=>"aaa","b"=>"bbb")); result is object who has keys with quotes. But for example see jquery animate, in documentation is keys without quotes, (This is also JS object format, right?)

                $("#someElement").animate({
                    marginLeft: "200px"
                },
                {
                    duration: 1000
                });

So, what is more right way?

Good read about JSON vs object literal: http://benalman.com/news/2010/03/theres-no-such-thing-as-a-json/ — Fabrício Matté, Oct 20 '12 at 19:45

score 13 · Accepted Answer · answered Oct 20 '12 at 19:42

13

Don't confuse JSON object and Javascript object literal. JSON object is basicly just a string and its syntax requires to have proper quotes. However for javascript object quotes around its properties are not necessary. But in some cases you have to use them, e.g:

var test = {
    "with spaces": 12
}

answered Oct 20 '12 at 19:42

dfsq

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1

O, right I confuse JSOn and JS objects. As I understood, in any case, better is write keys in quotes, so, thanks. – Oto Shavadze Oct 20 '12 at 19:59
3

No, better to not use quotes. Realy. You only need these extra characters in case if property name is not valid identifier: "with space", "hello-john", "123test", etc. – dfsq Oct 20 '12 at 20:02
Understood, thanks very much. – Oto Shavadze Oct 20 '12 at 20:10

JS object keys with or without quotes?

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