How to get specific array from JSON object with Javascript?

Question

I am working with facebook JS SDK which returns user's information in JSON format. I know how to get the response like response.email which returns email address. But how to get an element from a nested array object? Example: user's education history may contain multiple arrays and each array will have an element such as "name" of "school". I want to get the element from the last array of an object.

This is a sample JSON I got:-

"education": [
{
  "school": {
    "id": "162285817180560",
    "name": "Jhenaidah** School"
  },
  "type": "H**hool",
  "year": {
    "id": "14404**5610606",
    "name": "2011"
  },
  "id": "855**14449421"
},
{
  "concentration": [
    {
      "id": "15158**968",
      "name": "Sof**ering"
    },
    {
      "id": "20179020**7859",
      "name": "Dig**ty"
    }
  ],
  "school": {
    "id": "10827**27428",
    "name": "Univer**g"
  },
  "type": "College",
  "id": "9885**826013"
},
{
  "concentration": [
    {
      "id": "108196**810",
      "name": "Science"
    }
  ],
  "school": {
    "id": "2772**996993",
    "name": "some COLLEGE NAME I WANT TO GET"
  },
  "type": "College",
  "year": {
    "id": "1388*****",
    "name": "2013"
  },
  "id": "8811215**16"
}]

Let's say I want to get "name": "some COLLEGE NAME I WANT TO GET" from the last array. How to do that with Javascript? I hope I could explain my problem. Thank you

Related: [Access / process (nested) objects, arrays or JSON](https://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json) — Jonathan Lonowski, Mar 11 '17 at 22:07
Related: [Get the last item in an array](https://stackoverflow.com/questions/3216013/get-the-last-item-in-an-array) — Jonathan Lonowski, Mar 11 '17 at 22:08

score 2 · Answer 1 · answered Mar 11 '17 at 22:10

2

If your json above was saved to an object called json, you could access the school name "some COLLEGE NAME I WANT TO GET" with the following:

json.education[2].school.name

answered Mar 11 '17 at 22:10

Steve Joachim

61
3

that 'education' is inside an array – Julfikar Mar 11 '17 at 22:20
The syntax is similar. If your json object is the first element of an array named `arr`, you can access the school name like this: `arr[0].education[2].school.name` – Steve Joachim Mar 11 '17 at 22:55

score 2 · Answer 2 · answered Mar 11 '17 at 22:12

2

If you know where that element is, then you can just select it as already mentioned by calling

var obj = FACEBOOK_ACTION;
obj.education[2].school.name

If you want to select specifically the last element, then use something like this:

obj.education[ obj.education.length - 1 ].scool.name

answered Mar 11 '17 at 22:12

lumio

7,428
4
40
56

Hi, thanks for your quick reply. But I have a confusion. what is FACEBOOK_ACTION here? – Julfikar Mar 11 '17 at 22:18
Well it is where your JSON data is stored. I just picked a random variable name where it might be stored :) Where is your JSON stored right now, then I will rewrite my answer for you – lumio Mar 11 '17 at 22:19
Oh thank you. My json starts like this:- { "id": "9040**1539", "name": "Mohammad Julfikar Mahmud", "email": "itsm**ail.com", "birthday": "02/10/19**", "education": [ { "school": { "id": "1622**0560", "name": "J***chool" }, – Julfikar Mar 11 '17 at 22:22
But how is the variable called? How do you call that JSON? – lumio Mar 11 '17 at 22:25
Sorry I didn't get it. This is the response that facebook returns :/ – Julfikar Mar 11 '17 at 22:27
I know, that is what Facebook returns. But how do you know, that facebook returns it? Where do you call it? Or are you just testing it on their SDK/Dev website? – lumio Mar 11 '17 at 22:29
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/137858/discussion-between-lumio-and-mohammad-julfikar). – lumio Mar 11 '17 at 22:31

Matt D. Webb · Accepted Answer · 2017-03-11T22:30:32.637

2

Here is a JsFiddle Example

var json = '{}' // your data;

// convert to javascript object:
var obj = JSON.parse(json);

// get last item in array:
var last = obj.education[obj.education.length - 1].school.name;
// result: some COLLEGE NAME I WANT TO GET

edited Mar 11 '17 at 22:30

answered Mar 11 '17 at 22:22

Matt D. Webb

3,216
4
29
51

the json I shared, was just a part of another json. how can I split it like you did in jsfiddle? – Julfikar Mar 11 '17 at 22:26
@MohammadJulfikar Create a Fork of the JsFiddle and update the JSON, then paste the link here, I will take a look! :-) – Matt D. Webb Mar 11 '17 at 22:27
@MohammadJulfikar awesome! :-) Glad I could help. – Matt D. Webb Mar 11 '17 at 22:31

Hamza Rashid · Answer 4 · 2017-03-11T22:38:58.723

Try this,

if (myData.hasOwnProperty('merchant_id')) {
    // do something here
}

where JSON myData is:

{
    amount: "10.00",
    email: "someone@example.com",
    merchant_id: "123",
    mobile_no: "9874563210",
    order_id: "123456",
    passkey: "1234"
}

This is a simple example for your understanding. In your scenario of nested objects, loop over your JSON data and use hasOwnProperty to check if key name exists.

How to get specific array from JSON object with Javascript?

4 Answers4