Serializing object with arrays with objects to JSON in javascript

Question

I have an object like this:

obj = {"arr1" : [], "arr2" : ['z1', 'z2', 'z3'], "arr3" : []};
obj['arr2']['z2'] = 'z8';

It has nested arrays, and each value of can be an object with or without arrays, etc.

How to get a JSON for that? JSON.stringify would lose 'z8' value.

Your object is invalid: arr2 should be an object, not an array. — VisioN
– VisioN, Commented Dec 20, 2012 at 12:08
Have you tried to execute this code? The first line isn't even valid JavaScript. — James M
– James M, Commented Dec 20, 2012 at 12:10
To elaborate on @VisioN's comment: In JavaScript, Objects always have a combination of key:value, Arrays never do. — Cerbrus
– Cerbrus, Commented Dec 20, 2012 at 12:11

Minko Gechev · Accepted Answer · 2012-12-20 12:15:09Z

3

In JSON (by standard) you have Arrays, Objects, values and strings, arrays are not Objects like in JavaScript. JSON is only a data-interchange format, you don't have a base prototype like in JavaScript where almost everything is an object and have properties.

So, if you want to have a property z3 of z2 you have to make z2 an object.

answered Dec 20, 2012 at 12:15

Minko Gechev

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Selvaraj M A · Accepted Answer · 2012-12-20 12:14:43Z

2

arr2 is an array. You cannot use it like a map.

var obj = {"arr1" : [], "arr2" : ['z1', {'z2':'z3'}], "arr3" : []};
obj['arr2'][1]["z2"] = 'z8';
alert(JSON.stringify(obj));

Fiddle

answered Dec 20, 2012 at 12:14

Selvaraj M A

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