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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.

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Your object is invalid: arr2 should be an object, not an array. – VisioN 17 mins ago
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Have you tried to execute this code? The first line isn't even valid JavaScript. – James McLaughlin 16 mins ago
To elaborate on @VisioN's comment: In JavaScript, Objects always have a combination of key:value, Arrays never do. – Cerbrus 15 mins ago
Fixed the object – Lapa 30 secs ago
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2 Answers

up vote 1 down vote

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.

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up vote 0 down vote

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

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