Consider using arrays instead of numerated object.

Arrays in json are defined using [] http://www.json.org/

Here is an example:

var foo = {
    "logged_in":true,
    "town":"Dublin",
    "state":"Ohio",
    "country":"USA",
    "products":
    [
        {
            "pic_id":"1500",
            "description":"Picture of a computer",
            "localion":"img.cloudimages.us/2012/06/02/computer.jpg",
            "type":"jpg",
            "childrenimages":
            [
                {
                    "pic_id":"15011",
                    "description":"Picture of a cpu",
                    "localion":"img.cloudimages.us/2012/06/02/mycpu.png",
                    "type":"png"
                },
                {
                    "pic_id":"15012",
                    "description":"Picture of a cpu two",
                    "localion":"img.cloudimages.us/2012/06/02/thiscpu.png",
                    "type":"png"
                }
            ]
        },
        {
            "pic_id":"1501",
            "description":"Picture of a cpu",
            "localion":"img.cloudimages.us/2012/06/02/cpu.png",
            "type":"png"
        }
    ],
};

(Forgive me if I forgot either closing { or [ or , its pretty hard to type code in SO :p )

This way you dont even need to have counts like

"products":2,

or

"childrenimages":2

You simply do

foo.products.length

or

foo.products[0].childrenimages.length

Good luck :)

an object literal has no .length

you can count properties using this method:

var count = 0;

for (i in jsonString) {
    if (jsonString.hasOwnProperty(i)) {
        count++;
    }
}

alert(count); //count shall have length for you

OR

since your array didn't have numeric indices (starting from 0), it assumed you used an associative array, hence they dumped an object of items rather than an array of items.

to turn them to numeric indices, all you have to do is use array_values before encoding them to json:

json_encode(array_values($array));

then the json will be an array.. then you can use length

from this:

Array(
[1] => Array(
        [product_id] => 1
        [product_model] => HFJ5G1.5
        [product_type] => plat
        [product_return] => graviteits
    )
[2] => Array(
        [product_id] => 2
        [product_model] => HHJ5S2.5
        [product_type] => holle plunjer
        [product_return] => veer       
    )
);

it becomes this using array_values(), note the indexes per item:

Array(
[0] => Array(
        [product_id] => 1
        [product_model] => HFJ5G1.5
        [product_type] => plat
        [product_return] => graviteits
    )
[1] => Array(
        [product_id] => 2
        [product_model] => HHJ5S2.5
        [product_type] => holle plunjer
        [product_return] => veer       
    )
);

then encoded to json and stored to jsonString:

jsonString = [
    {
        "product_id": "1",
        "product_model": "HFJ5G1.5",
        "product_type": "plat",
        "product_return": "graviteits"
    },
    {
        "product_id": "2",
        "product_model": "HHJ5S2.5",
        "product_type": "holle plunjer",
        "product_return": "veer"
    }
];

alert(jsonString.length);

@qDebug said:

Without [ and ] at the beginning an end, i can access the data. After a lot of try and error, i can't find the right solution to overcome the [ ].

• [ ] represents an array.
• { } represents an object.

NOTE: Your document does not contain any multidimensional arrays! It does contain objects-inside-arrays, arrays-inside-objects, and objects-inside-objects.

QJsonDocument search = QJsonDocument::fromJson(myJson.toUtf8());
QJsonObject getjson = search.object();

...

QJsonValue(undefined)

Why?

Look closely at your JSON document structure.

Your top-level structure is a JSON array, so you must convert the document to a QJsonArray, not a QJsonObject.

Then, notice that your top-level array contains 1 object. Extract this object from the array first. Then, you can access the object's "site" field (which is also an object).