JSON.stringify not display properly, while use multiple javascript object

Question

I have use generate the javascript multiple object based my page result, then convert to JSON string. but JSON.stringify not display properly. I don't know why display like this. I have added example of my coding

var sample_object = [];
var sub_array = [];
sub_array["type"] = 'I';
sample_object.push(sub_array);

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

Result :-

[Array[0]]
    0: Array[0]
        length: 0
        type: "I"_
        _proto__: Array[0]
        length: 1__proto__:
        Array[0]

JSON.stringify Output

 [[]]

Thanks in advance!

sub_array["type"] = 'I'; This statement will have no effect — Satpal
– Satpal, Commented Jan 29, 2016 at 9:16

Rory McCrossan · Accepted Answer · 2016-01-29 09:16:52Z

2

It's because you can't have named arguments in an array. You need to change sub_array to an object. Also note that the variable you have named sample_object is actually an array. Here's a working version with appropriately named variables:

var sample_array = [];
var sub_object = {};
sub_object["type"] = 'I';
sample_array.push(sub_object);

console.log(sample_array);
console.log(JSON.stringify(sample_array)); // = '[{"type":"I"}]'

Example fiddle

You can even shorten the first four lines to just this:

var sample_array = [{ type: 'I' }];

answered Jan 29, 2016 at 9:16

Rory McCrossan

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3 Comments

msvairam Over a year ago

Thanks for your answer, Worked

Rory McCrossan Over a year ago

No problem, glad to help.

Pavel Gatnar Over a year ago

You can have custom properties in Array! Array instance is Object instance too...

Pavel Gatnar · Accepted Answer · 2016-01-29 09:18:41Z

0

Only Array indexes from 0 to a.length-1 are used by JSON.stringify, it is ok. If you want to create another properties, use object...

e.g.

var x={type:"i",data:[]}

answered Jan 29, 2016 at 9:18

Pavel Gatnar

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1 Comment

msvairam Over a year ago

Thanks for your help

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