How to parse through a JSON object Map

Question

If I have a JSON Object Map :

var dataItem=[{
  "Lucy":{
    "id": 456,
    "full_name": "GOOBER, ANGELA",
    "user_id": "2733245678",
    "stin": "2733212346"
  },
  "Myra":{
    "id": 123,
    "full_name": "BOB, STEVE",
    "user_id": "abc213",
    "stin": "9040923411"
  }
}]

I want to iterate through this list and access the names (i.e. Lucy, Myra ) and corresponding information

All the loops that I came across looped through the list like this :

var dataItem = [
    {"Name":"Nthal","Class":3,"SubjectName":"English "},
    {"Name":"Mishal","Class":4,"SubjectName":"Grammer"},
    {"Name":"Sanjeev","Class":3,"SubjectName":"Social"},
    {"Name":"Michal","Class":5,"SubjectName":"Gk"},
]

for(x in dataItem)
{
alert(dataItem[x].Name);
alert(dataItem[x].Class);
alert(dataItem[x].SubjectName);
}

Thanks in advance

You have an array with a single item, so loop through the properties for that object: for(var x in dataItem[0]) — Matt Burland
– Matt Burland, Commented Apr 9, 2014 at 18:39
possible duplicate of Access / process (nested) objects, arrays or JSON — Felix Kling
– Felix Kling, Commented Apr 9, 2014 at 18:47

Paul · Accepted Answer · 2014-04-09 18:40:39Z

1

What you have there is not JSON, maybe because you've already parsed it. You have is an array consisting of a single object, with names for its keys. Regardless, I'll show you how to access that data:

var data = dataItem[0];
for(name in data) {
    alert(name);
    alert(data[name].id);
    alert(data[name].full_name);
}

answered Apr 9, 2014 at 18:40

Paul

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4 Comments

greengrassbluesky Over a year ago

Thanks very much for a quick reply. I added this code and for name I get each and every letter not the whole name. so in case of "Lucy" I get "L", "U" ,"C", "Y" for each iteration of for and not the whole name "lucy". Can you please help me ? Where am I going wrong ?

greengrassbluesky Over a year ago

It seems to me like its never converting my JSON string to JSON Object. I tried using JSON.parse and $.parseJSON. None of them seem to work.

greengrassbluesky Over a year ago

sorry for the inconvinience.. my problem was that I was logging using console.log (" jsonObj:"+jsonObj); which was converting my object to string and hence printing wrong data.

Paul Over a year ago

@greengrassbluesky No problem, if you want to log an object with a string like that, you can pass them as separate arguments to console.log, like this: console.log('jsonObj:', jsonObj);. That should give you some nice output.

Matt Burland · Accepted Answer · 2014-04-09 18:42:15Z

0

for (var x in dataItem[0]) {
    if (dataItem[0].hasOwnProperty(x)) {
        console.log(x);
    }
}

http://jsfiddle.net/B44LW/

If you want other properties, then you can use the bracket notation:

dataItem[0][x].id

answered Apr 9, 2014 at 18:42

Matt Burland

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1 Comment

greengrassbluesky Over a year ago

Thanks a lot for creating a fiddle. I am sorry that I didnt mention the in the original question that I am also converting JSON string to JSON object before looping through it. turns out the problem is in conversion. I updated the fiddle to following: jsfiddle.net/B44LW/1

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