convert json array to javascript array

Question

i have a json array that i want to convert into a plain javascript array:

This is my json array:

var users = {"0":"John","1":"Simon","2":"Randy"}

How to convert it into a plain javascript array like this:

var users = ["John", "Simon", "Randy"]

I also found this useful: http://stackoverflow.com/questions/4375537/convert-json-string-to-array-of-json-objects-in-javascript — shasi kanth, Apr 11 '11 at 15:10
@anil This might help: http://stackoverflow.com/a/12289961/386579 — shasi kanth, Jan 19 '17 at 11:48

score 9 · Accepted Answer · edited May 23 '17 at 11:53

9

users is already a JS object (not JSON). But here you go:

var users_array = [];
for(var i in users) {
    if(users.hasOwnProperty(i) && !isNaN(+i)) {
        users_array[+i] = users[i];
    }
}

Edit: Insert elements at correct position in array. Thanks @RoToRa.

Maybe it is easier to not create this kind of object in the first place. How is it created?

edited May 23 '17 at 11:53

Community

answered Apr 11 '11 at 08:19

Felix Kling

This json array is created dynamically with Zend_Json::encode, but the response is passed back to a js function, that accepts a plain javascript array. – shasi kanth Apr 11 '11 at 09:03
2

@dskanth: If you are not doing anything fancy, use the native function `json_encode`. It will only turn associative arrays into JSON objects and numerical indexed ones into arrays. – Felix Kling Apr 11 '11 at 09:10
4

Careful, your code may not assign the values to the correct indexes, because you are assuming the object properties are iterated sorted. `if (!isNaN(+i)) {users_array[+i] = users[i]}` may be better. – RoToRa Apr 11 '11 at 09:37
@RoToRa: You are right. No I did not assume that they are sorted, but I didn't pay attention to the order... I will add this to my answer. – Felix Kling Apr 11 '11 at 09:46

David Tang · Answer 2 · 2011-04-11T10:10:56.907

4

Just for fun - if you know the length of the array, then the following will work (and seems to be faster):

users.length = 3;
users = Array.prototype.slice.call(users);

edited Apr 11 '11 at 10:10

answered Apr 11 '11 at 09:59

David Tang

score 0 · Answer 3 · answered Feb 24 '14 at 12:28

0

Well, here is a Jquery+Javascript solution, for those who are interested:

var user_list = [];

$.each( users, function( key, value ) {
    user_list.push( value );    
});

console.log(user_list);

answered Feb 24 '14 at 12:28

shasi kanth

3 Answers3