Loop and get key/value pair for JSON array using jQuery

Question

I'm looking to loop through a JSON array and display the key and value.

It should be a simplified version of the following post, but I don't seem to have the syntax correct: jQuery 'each' loop with JSON array

I also saw the post Get name of key in key/value pair in JSON using jQuery?, but it also seemed like lots of code for a simple activity.

This illustrates what I'm looking for (but it doesn't work):

var result = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
$.each(result, function(k, v) {
             //display the key and value pair
            alert(k + ' is ' + v);
        });

There is no mandatory jQuery requirement, but it is available. I can also restructure the JSON if it cuts down the required code.

You have to parse JSON to a JavaScript object first. – Felix Kling Oct 22 '11 at 16:49 — Felix Kling, Oct 22 '11 at 16:49

score 147 · Accepted Answer · edited Oct 21 '17 at 11:01

147

You have a string representing a JSON serialized JavaScript object. You need to deserialize it back to a JavaScript object before being able to loop through its properties. Otherwise you will be looping through each individual character of this string.

var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
var result = $.parseJSON(resultJSON);
$.each(result, function(k, v) {
    //display the key and value pair
    alert(k + ' is ' + v);
});

Live demo.

edited Oct 21 '17 at 11:01

Peter Mortensen

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answered Oct 22 '11 at 16:49

Darin Dimitrov

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Excellent. I added var result = $.parseJSON(resultJSON); and now it works. – JStark Oct 22 '11 at 17:32
@Darin how to get "index" value? – Darshan theerth Nov 15 '17 at 11:33

score 18 · Answer 2 · edited May 23 '15 at 07:20

18

var obj = $.parseJSON(result);
for (var prop in obj) {
    alert(prop + " is " + obj[prop]);
}

edited May 23 '15 at 07:20

mythicalcoder

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answered Oct 22 '11 at 16:49

xdazz

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score 7 · Answer 3 · edited May 23 '15 at 07:21

7

You can get the values directly in case of one array like this:

var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
var result = $.parseJSON(resultJSON);
result['FirstName']; // return 'John'
result['LastName'];  // return ''Doe'
result['Email']; // return 'johndoe@johndoe.com'
result['Phone'];  // return '123'

edited May 23 '15 at 07:21

mythicalcoder

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answered Dec 30 '13 at 12:02

Oskar

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score 6 · Answer 4 · edited Oct 21 '17 at 11:03

6

The following should work for a JSON returned string. It will also work for an associative array of data.

for (var key in data)
     alert(key + ' is ' + data[key]);

edited Oct 21 '17 at 11:03

Peter Mortensen

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answered Mar 03 '14 at 01:40

Smith

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`JSON` string has to be parsed into `JSON` object. – mythicalcoder May 23 '15 at 06:39

score 2 · Answer 5 · answered May 23 '15 at 06:34

Parse the JSON string and you can loop through the keys.

var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"johndoe@johndoe.com","Phone":"123 dead drive"}';
var data = JSON.parse(resultJSON);

for (var key in data)
{
    //console.log(key + ' : ' + data[key]);
    alert(key + ' --> ' + data[key]);
}

score 0 · Answer 6 · edited Oct 21 '17 at 11:02

0

The best and perfect solution for this issue:

I tried the jQuery with the Ajax success responses, but it doesn't work so I invented my own and finally it works!

Click here to see the full solution

var rs = '{"test" : "Got it perfect!","message" : "Got it!"}';
eval("var toObject = "+ rs + ";");
alert(toObject.message);

edited Oct 21 '17 at 11:02

Peter Mortensen

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answered Jul 01 '13 at 19:21

Loop and get key/value pair for JSON array using jQuery

6 Answers6

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