working - string to json javascript

As mentioned by numerous others, most browsers support JSON.parse and JSON.stringify.

Now, I'd also like to add that if you are using AngularJS (which I highly recommend), then it also provides the functionality that you require:

var myJson = '{"result": true, "count": 1}';
var obj = angular.fromJson(myJson);//equivalent to JSON.parse(myJson)
var backToJson = angular.toJson(obj);//equivalent to JSON.stringify(obj)

I just wanted to add the stuff about AngularJS to provide another option. NOTE that AngularJS doesn't officially support Internet Explorer 8 (and older versions, for that matter), though through experience most of the stuff seems to work pretty well.

I thought JSON.parse(myObject) would work. But depending on the browsers, it might be worth using eval('('+myObject+')'). The only issue I can recommend watching out for is the multi-level list in JSON.

If you are getting this from an outside site it might be helpful to use jQuery's getJSON. If it's a list you can iterate through it with $.each

$.getJSON(url, function (json) {
    alert(json.result);
    $.each(json.list, function (i, fb) {
        alert(fb.result);
    });
});

If you pass a string variable (a well-formed JSON string) to JSON.parse from MVC @Viewbag that has doublequote, '"', as quotes, you need to process it before JSON.parse (jsonstring)

    var jsonstring = '@ViewBag.jsonstring';
    jsonstring = jsonstring.replace(/"/g, '"');  

If you use Dojo Toolkit:

require(["dojo/json"], function(JSON){
    JSON.parse('{"hello":"world"}', true);
});

If you want to use JSON 3 for older browsers, you can load it conditionally with:

<script>
    window.JSON || 
    document.write('<script src="//cdnjs.cloudflare.com/ajax/libs/json3/3.2.4/json3.min.js"><\/scr'+'ipt>');
</script>

Now the standard window.JSON object is available to you no matter what browser a client is running.

JSON.parse() converts any JSON String passed into the function, to a JSON object.

For better understanding, press F12 to open the Inspect Element of your browser, and go to the console to write the following commands:

var response = '{"result":true,"count":1}'; // Sample JSON object (string form)
JSON.parse(response); // Converts passed string to a JSON object.

Now run the command:

console.log(JSON.parse(response));

You'll get output as Object {result: true, count: 1}.

In order to use that object, you can assign it to the variable, let's say obj:

var obj = JSON.parse(response);

Now by using obj and the dot(.) operator you can access properties of the JSON Object.

Try to run the command

console.log(obj.result);

The easiest way using parse() method:

var response = '{"a":true,"b":1}';
var JsonObject= JSON.parse(response);

this is an example of how to get values:

var myResponseResult = JsonObject.a;
var myResponseCount = JsonObject.b;

The following example will make it clear:

var jsontext   = '{"name":"x","age":"11"}';
var getContact = JSON.parse(jsontext);
document.write(getContact.name + ", " + getContact.age);

// Output: x, 11

OR

You can also use the eval function. The following example is using the eval function:

var jsontext   = '{"name":"x","age":"11"}';
var getContact = eval('(' + jsontext + ')');
document.write(getContact.name + ", " + getContact.age);

// Output: x, 11

Since the JSON.parse function is more secure and executes faster than the eval function, I recommend you to use JSON.parse function.

You can either use the eval function as in some other answers. (Don't forget the extra braces.) You will know why when you dig deeper), or simply use the jQuery function parseJSON:

var response = '{"result":true , "count":1}'; 
var parsedJSON = $.parseJSON(response);

OR

You can use this below code.

var response = '{"result":true , "count":1}';
var jsonObject = JSON.parse(response);

And you can access the fields using jsonObject.result and jsonObject.count.