how would to count elements in keyed json in jquery

Question

I wan't to find the number of records in a keyed json object in jquery.

For example if I have an indexed object as follows

var json = [{"key1":{"value":"33"},"key2":{"value":"36 "},"key3":{"value":"38"},"key4":{"value":"41"}}]

How could I get a count of the number of records? (their are 4 records)

json.length returns undefined

Barry Hamilton
– Barry Hamilton

2015-08-07 08:07:57 +00:00
Commented Aug 7, 2015 at 8:07 — Barry Hamilton
– Barry Hamilton, Commented Aug 7, 2015 at 8:07
the format of json variable is invalid

Tushar
– Tushar

2015-08-07 08:08:56 +00:00
Commented Aug 7, 2015 at 8:08 — Tushar
– Tushar, Commented Aug 7, 2015 at 8:08
I have just corrected that

Barry Hamilton
– Barry Hamilton

2015-08-07 08:09:24 +00:00
Commented Aug 7, 2015 at 8:09 — Barry Hamilton
– Barry Hamilton, Commented Aug 7, 2015 at 8:09
Check this Object.keys(json[0]).length

Tushar
– Tushar

2015-08-07 08:10:29 +00:00
Commented Aug 7, 2015 at 8:10 — Tushar
– Tushar, Commented Aug 7, 2015 at 8:10

Tushar · Accepted Answer · 2015-09-01 07:45:46Z

1

Use Object.keys() to get the array of all the keys in object.

In your case, json array contains an object. So, you can use json[0] to get the object from array and then use Object.keys() on it.

Object.keys(json[0]).length

var json = [{
  "key1": {
    "value": "33"
  },
  "key2": {
    "value": "36 "
  },
  "key3": {
    "value": "38"
  },
  "key4": {
    "value": "41"
  }
}];

document.write(Object.keys(json[0]).length);

edited Sep 1, 2015 at 7:45

answered Aug 7, 2015 at 8:13

Tushar

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