JSON array length

Question

Here is my JSON array code

var App = [
 {
   "id": "123",
   "caption": "Test",
   "description": "Test Desc"
 },
 {
   "id": "345",
   "caption": "adsasdasd",
   "description": ""
 },
 {
   "id": "456",
   "caption": "adsasdasd",
   "description": ""
 },
 {
   "id": "578",
   "caption": "adsasdasd",
   "description": ""
 }
]

i tried with the following code

var obj = $.parseJSON(App);
alert(JSON.stringify(obj,4,null));
var AppLen = obj[i].length;
alert(AppLen);

but i didn't get any solution. Let me know if i missed any thing to get the JSON object array length.

where is question? can you explain wnat you want? anyway see [mdn](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/length) — Grundy, Dec 18 '14 at 08:17

score 1 · Answer 1 · answered Dec 18 '14 at 08:52

your data is already json format:do like this

var App = [
           {
             "id": "123",
             "caption": "Test",
             "description": "Test Desc"
           },
           {
             "id": "345",
             "caption": "adsasdasd",
             "description": ""
           },
           {
             "id": "456",
             "caption": "adsasdasd",
             "description": ""
           },
           {
             "id": "578",
             "caption": "adsasdasd",
             "description": ""
           }
          ];

console.log(App);
console.log(App[0].length);// you can not get length from this because it is not array it's an object now.

var AppLen = App.length;
alert(AppLen);

score -1 · Answer 2 · edited May 23 '17 at 10:26

-1

obj.size() or obj.length

If that dont run try this: Length of a JavaScript object

Object.size = function(obj) {
    var size = 0, key;
    for (key in obj) {
        if (obj.hasOwnProperty(key)) size++;
    }
    return size;
};

// Get the size of an object
var size = Object.size(myArray);

edited May 23 '17 at 10:26

Community

1
1

answered Dec 18 '14 at 08:22

Raúl Monge

223
2
7

There is not `.count()` neither for `Object` nor for `Array` – t.niese Dec 18 '14 at 08:40
1

Extending `Object.prototype` is a **very bad** practice, that can be compared to killing kittens or genocide. – Ginden Dec 18 '14 at 08:44
@Ginden In this case it is not the `Object.prototype` but the `Object` itself. But yes neither the `prototype` nor the Object itself of a standard Object should be changed/modified unless it is a poly-fill. – t.niese Dec 18 '14 at 09:12

JSON array length

2 Answers2