Safely turning a JSON string into an object

Question

Given a string of JSON data, how can you safely turn that string into a JavaScript object?

Obviously you can do this unsafely with something like...

var obj = eval("(" + json + ')');

...but that leaves us vulnerable to the json string containing other code, which it seems very dangerous to simply eval.

Answer 1

JSON.parse(jsonString);

json.parse will change into object.

Answer 2

You also can use reviver function to filter.

var data = JSON.parse(jsonString, function reviver(key, value) {
   //your code here to filter
});

for more information read JSON.parse

Answer 3

Just for fun, here is the way using function :

 jsonObject = (new Function('return ' + jsonFormatData))()

Answer 4

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

For Better understanding press F12 to open Inspect Element of your browser and go to console to write following commands : -

var response = '{"result":true,"count":1}'; //sample json object(string form)
JSON.parse(response); //converts passed string to 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 dot(.) operator you can access properties of the JSON Object.

Try to run the command

console.log(obj.result);

Answer 5

The jQuery method is now deprecated. Use this method instead:

let jsonObject = JSON.parse(jsonString);

---

Original answer using deprecated jQuery functionality:

If you're using jQuery just use:

jQuery.parseJSON( jsonString );

It's exactly what you're looking for (see the jQuery documentation).

Answer 6

Edit: This answer is for IE < 7, for modern browsers check Jonathan's answer above.

Edit: This answer is outdated and Jonathan's answer above (JSON.parse(jsonString)) is now the best answer.

JSON.org has JSON parsers for many languages including 4 different ones for Javascript. I believe most people would consider json2.js their goto implementation.