JSON.stringify array resulting in double brackets

Question

var DTO = [];

$.each(data.Foobars, function(i, val){
    DTO.push(val);
});

//example of a stringified object in the array:
// var val = {"a":"1","b":"2","c":"3"};

var jsonString = JSON.stringify(DTO);

With one object in the array the ´jsonString´ would look like:

[{"a":"1","b":"2","c":"3"}]

With more than one:

[[{"a":"1","b":"2","c":"3"}, {"a":"1","b":"2","c":"3"}]]

Resulting in double brackets, which is causing me some problems serverside.

How can i get rid of the double brackets? Thanks

Causing you more problems server-side? The JavaScriptSerializer should have no problems with that :) — Mathew Thompson
– Mathew Thompson, Commented May 22, 2012 at 11:58
@mattytommo im using JSON.net and it has some problems with it. — Johan
– Johan, Commented May 22, 2012 at 12:01
@Johan that's what comes from JSON.stringify(); but have you inspected the value of DTO on the console? — Ja͢ck
– Ja͢ck, Commented May 22, 2012 at 12:06

Thach Mai · Accepted Answer · 2012-05-22 12:53:57Z

4

Are you sure the val object is not an array itself?

In my little test: http://jsfiddle.net/NatJS/, JSON.stringify works just fine.

Update: if val is an array, you need to treat it appropriately, such as: http://jsfiddle.net/NatJS/1/

var a = [{ a: 1, b: 2, c: 3},{ d: 10, e: 11, f: 12}];
//var a = { a: 1, b: 2, c: 3}
var j = [];


if (a.length) { // cheap way to check if a an an array; implement something like mooTools.typeOf if you want something more robust
    while (a.length > 0) {
        j.push(a.pop());               
    }
}
else {
    j.push(a);
}

console.log(JSON.stringify(j));

edited May 22, 2012 at 12:53

answered May 22, 2012 at 12:14

Thach Mai

9551 gold badge6 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Thach Mai Over a year ago

See me update above, you should check for the type of val and treat it appropriately. If you're pushing an array into an array, JSON.stringify behaves exactly like it should :)

Johan Over a year ago

I used typeof to check if it was an array. Should have used $.isArray. Solved it with jquerys $.makeArray (only makes one if necessary). Thanks

Ja͢ck · Accepted Answer · 2012-05-22 12:11:46Z

1

The comment area is too small for this.

Take a look at the following simplification of your problem:

var DTO = [];

DTO.push({"a":"1","b":"2","c":"3"});
DTO.push({"a":"1","b":"2","c":"3"});

console.log(JSON.stringify(DTO));

It will show:

[{"a":"1","b":"2","c":"3"},{"a":"1","b":"2","c":"3"}]

Conclusion: whatever you think val should contain it's not ;-)

answered May 22, 2012 at 12:11

Ja͢ck

174k39 gold badges269 silver badges316 bronze badges

1 Comment

Johan Over a year ago

My problem seems to be that if data.Foobars.length == 1 then val will contains the values of the object. 1,2,3. But if there are more than one object, val will be the entire object...

Jyaif · Accepted Answer · 2013-05-21 07:50:07Z

0

Check if toJSON is defined on your object. If it is defined, it can modify the behavior of stringify.

answered May 21, 2013 at 7:50

Jyaif

1,1351 gold badge10 silver badges18 bronze badges

Collectives™ on Stack Overflow

JSON.stringify array resulting in double brackets

3 Answers 3

2 Comments

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related