Make a JSON in JavaScript

Question

I have strange issue, which I don't understand. I would like to make a JSON Object in JavaScript. My example code:

$(document).ready(function(){

var myJson = new Object();
var data = new Object();
myJson.items = [];

data.name  = 'test';

for (i = 0; i < 5; i++){
  data.counter = i;
  myJson.items.push(data);  
}
console.log(JSON.stringify(myJson));

});

Output:

{"items":[{"name":"test","counter":4},{"name":"test","counter":4},{"name":"test","counter":4},{"name":"test","counter":4},{"name":"test","counter":4}]}

Why the counter variable in JSON have always value 4 ??????

The property you're changing is always the same data.counter. — Teemu
– Teemu, Commented Nov 9, 2016 at 8:15

asdf_enel_hak · Accepted Answer · 2016-11-09 08:15:22Z

4

You are always working on the same data object
instead try putting data object initialization in loop

var myJson = new Object();

myJson.items = [];



for (i = 0; i < 5; i++){
  var data = new Object();
  data.name  = 'test';
  data.counter = i;
  myJson.items.push(data);  
}
console.log(JSON.stringify(myJson));

answered Nov 9, 2016 at 8:15

asdf_enel_hak

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1 Comment

Joshua Over a year ago

Construct objects, push them,to an array then JSON.stringify is also an option.

James · Accepted Answer · 2016-11-09 08:17:29Z

1

create a new object of var data = new Object(); inside for loop, comment the above one, also put data.name = 'test'; inside for loop

answered Nov 9, 2016 at 8:17

James

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