How to count JSON objects

Question

Here is my JSON:

[
    {
        \"id\": \"38\",
        \"article_id\": \"16\",
        \"news_event\": \"625\",
        \"language\": \"en\",
        \"cha         


        

Answer 1

Assuming it's in the variable foo, foo.length.

var foo = [{...},{...},...];
alert(foo.length);
foo[0].id// 38;

Answer 2

var json = [{ "id": "38", "article_id": "16", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:42", "website": null, "show_hours": null, "page_text": null }, { "id": "37", "article_id": "15", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:39", "website": null, "show_hours": null, "page_text": null }, { "id": "36", "article_id": "14", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:35", "website": null, "show_hours": null, "page_text": null }, { "id": "35", "article_id": "13", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:31", "website": null, "show_hours": null, "page_text": null}]


//Object.keys(json).length --> USE

for (var i = 1, l = Object.keys(json).length; i <= l; i++) {

}

//by:Jorge Nones, Jales.

Answer 3

That's an array.
You can parse it (JSON.parse), then use the length property.

Answer 4

You can also use online JSON editors to verify, for instance, try JSON Editor Online by josdejong

Answer 5

This routine counts 4 array elements with 16 attributes per element:

var obj = [{ "id": "38", "article_id": "16", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:42", "website": null, "show_hours": null, "page_text": null }, { "id": "37", "article_id": "15", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:39", "website": null, "show_hours": null, "page_text": null }, { "id": "36", "article_id": "14", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:35", "website": null, "show_hours": null, "page_text": null }, { "id": "35", "article_id": "13", "news_event": "625", "language": "en", "channel_partner_id": "625", "title": "Test", "show_logo": null, "description": "test\n\n", "schedule": null, "event_date": "2012-03-09 10:08:35", "link_text": null, "guid": null, "timestamp": "2012-03-09 11:19:31", "website": null, "show_hours": null, "page_text": null}]
for (var i = 0; i < obj.length; i++) {
  var ctr=0;
  for (attr in obj[i]) ctr++;
  alert('array['+i+']: ' +ctr);
}

Answer 6

You can use the following solution to count JSON objects:

var jsonObject = {"test1":1,"test2":2};
var keyCount  = Object.keys(jsonObject).length;