How to parse returning JSON object

Question

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How to parse json string to javascript object

I am trying to get the values of returned JSON object by using javascript.

returned data

data: "[{"userID":"35047","testID":"5","subject":"1"..and more}]

in javascript, how do I loop through the userID/testID and value...etc.

Thanks for the help

Answer 1

First parse with JSON.parse() then access them like an object. Example:

var obj = JSON.parse(your_data);

then

obj[0].userID

Explanation:

• The outer [] create an array and you can access the array elements by subscripts like obj[0].
• The inner {} create an object, and you can access the fields by their names. Therefore obj[0].userID, obj[0].testID, etc.

Note!

JSON.parse() requires a shim (see json.js/json2.js) in IE6/IE7. It may also be missing in other legacy browsers. You can however include it for all browsers because it detects that a native JSON.parse() exists.

Answer 2

jQuery can parse the JSON - http://api.jquery.com/jQuery.parseJSON/

And this post will show you how to iterate over key/value pairs in an object.

How do I loop through or enumerate a JavaScript object?

Answer 3

use JSON.parse()

var object = JSON.parse(jsonString);

Answer 4

First of all you need to parse the JSON, if you are targeting only this green browsers, then you can simply do:

var myJson = JSON.parse(data);

If not you can load a extern parse library like this one and then do it the same way.