How to parse JSON data with jQuery / JavaScript?

Question

I have a AJAX call that returns some JSON like this:

$(document).ready(function () {
    $.ajax({ 
        type: 'GET', 
        url: 'http://example/functions.php', 
        data: { get_param: 'value' }, 
        success: function (data) { 
            var names = data
            $('#cand').html(data);
        }
    });
});

Inside the #cand div I'll get:

[ { "id" : "1", "name" : "test1" },
  { "id" : "2", "name" : "test2" },
  { "id" : "3", "name" : "test3" },
  { "id" : "4", "name" : "test4" },
  { "id" : "5", "name" : "test5" } ]

How can I loop through this data and place each name in a div?

Answer 1

Assuming your server side script doesn't set the proper Content-Type: application/json response header you will need to indicate to jQuery that this is JSON by using the dataType: 'json' parameter.

Then you could use the $.each() function to loop through the data:

$.ajax({ 
    type: 'GET', 
    url: 'http://example/functions.php', 
    data: { get_param: 'value' }, 
    dataType: 'json',
    success: function (data) { 
        $.each(data, function(index, element) {
            $('body').append($('<div>', {
                text: element.name
            }));
        });
    }
});

or use the $.getJSON method:

$.getJSON('/functions.php', { get_param: 'value' }, function(data) {
    $.each(data, function(index, element) {
        $('body').append($('<div>', {
            text: element.name
        }));
    });
});

Answer 2

Setting dataType:'json' will parse JSON for you:

$.ajax({
  type: 'GET',
  url: 'http://example/functions.php',
  data: {get_param: 'value'},
  dataType: 'json',
  success: function (data) {
    var names = data
    $('#cand').html(data);
  }
});

Or else you can use parseJSON:

var parsedJson = $.parseJSON(jsonToBeParsed);

Then you can iterate the following:

var j ='[{"id":"1","name":"test1"},{"id":"2","name":"test2"},{"id":"3","name":"test3"},{"id":"4","name":"test4"},{"id":"5","name":"test5"}]';

...by using $().each:

var json = $.parseJSON(j);
$(json).each(function (i, val) {
  $.each(val, function (k, v) {
    console.log(k + " : " + v);
  });
}); 

JSFiddle

Answer 3

Try following code, it works in my project:

//start ajax request
$.ajax({
    url: "data.json",
    //force to handle it as text
    dataType: "text",
    success: function(data) {

        //data downloaded so we call parseJSON function 
        //and pass downloaded data
        var json = $.parseJSON(data);
        //now json variable contains data in json format
        //let's display a few items
        for (var i=0;i<json.length;++i)
        {
            $('#results').append('<div class="name">'+json[i].name+'</>');
        }
    }
});

Answer 4

 $(document).ready(function () {
    $.ajax({ 
        url: '/functions.php', 
        type: 'GET',
        data: { get_param: 'value' }, 
        success: function (data) { 
         for (var i=0;i<data.length;++i)
         {
         $('#cand').append('<div class="name">data[i].name</>');
         }
        }
    });
});

Answer 5

Use that code.

     $.ajax({

            type: "POST",
            contentType: "application/json; charset=utf-8",
            url: "Your URL",
            data: "{}",
            dataType: "json",
            success: function (data) {
                alert(data);
            },
            error: function (result) {
                alert("Error");
            }
        });

Answer 6

ok i had the same problem and i fix it like this by removing [] from [{"key":"value"}]:

1. in your php file make shure that you print like this

echo json_encode(array_shift($your_variable));

2. in your success function do this

 success: function (data) {
    var result = $.parseJSON(data);
      ('.yourclass').append(result['your_key1']);
      ('.yourclass').append(result['your_key2']);
       ..
    }

and also you can loop it if you want

Answer 7

I agree with all the above solutions, but to point out whats the root cause of this issue is, that major role player in all above code is this line of code:

dataType:'json'

when you miss this line (which is optional), the data returned from server is treated as full length string (which is default return type). Adding this line of code informs jQuery to convert the possible json string into json object.

Any jQuery ajax calls should specify this line, if expecting json data object.

Answer 8

var jsonP = "person" : [ { "id" : "1", "name" : "test1" },
  { "id" : "2", "name" : "test2" },
  { "id" : "3", "name" : "test3" },
  { "id" : "4", "name" : "test4" },
  { "id" : "5", "name" : "test5" } ];

var cand = document.getElementById("cand");
var json_arr = [];
$.each(jsonP.person,function(key,value){
    json_arr.push(key+' . '+value.name  + '<br>');
    cand.innerHTML = json_arr;
});

<div id="cand">
</div>

Answer 9

Json data

data = {"clo":[{"fin":"auto"},{"fin":"robot"},{"fin":"fail"}]}

When retrieve

$.ajax({
  //type
  //url
  //data
  dataType:'json'
}).done(function( data ) {
var i = data.clo.length; while(i--){
$('#el').append('<p>'+data.clo[i].fin+'</>');
}
});

Answer 10

$.ajax({
  url: '//.xml',
  dataType: 'xml',
  success: onTrue,
  error: function (err) {
      console.error('Error: ', err);
  }
});

$('a').each(function () {
  $(this).click(function (e) {
      var l = e.target.text;
      //array.sort(sorteerOp(l));
      //functionToAdaptHtml();
  });
});

Answer 11

Here's how you would do this in JavaScript, this is a really efficient way to do it!

let data = "{ "name": "mark"}"
let object = JSON.parse(data);
console.log(object.name);

this would print mark