Safely turning a JSON string into an object

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

Obviously I can do this unsafely with something like:

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

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


JSON.parse(jsonString) is a pure JavaScript approach so long as you can guarantee a reasonably modern browser.

JSON.parse(), JSON.parse(jsonString) is a clean JavaScript approach if you can guarantee a reasonably modern browser. Safely turning a JSON string into an object -JSON.parse() converts any JSON String passed into the function, to a JSON Object.


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).

3 ways to convert String to JSON object in Java?, 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  It takes a JSON and parses it into an object so as to access the elements in the provided JSON. Example-1 In the following example, a JOSN is assigned to a variable and converted it into an object and later on displayed the values of the elements in the JSON as shown in the output.


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

This answer is outdated and Jonathan's answer above (JSON.parse(jsonString)) is now the best answer.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 four different ones for JavaScript. I believe most people would consider json2.js their goto implementation.

JSON.parse(), jQuery.parseJSON( json )Returns: String or Number or Object or Array or Booleanversion To parse JSON strings use the native JSON.parse method instead. JSON format can be easily converted into Java objects in an Object oriented manner. JSON is interoperable: program and platform independent. Java Object to Json String: Tutorial. Step by step examples of how to convert Java Object to JSON string. The most common way to convert Java Object to JSON string is to use an API. The most common APIs for this purpose are Jackson and GSON.


Use the simple code example in "JSON.parse()":

var jsontext = '{"firstname":"Jesper","surname":"Aaberg","phone":["555-0100","555-0120"]}';
var contact = JSON.parse(jsontext);

and reversing it:

var str = JSON.stringify(arr);

Safely turning a JSON string into an object, toJson() – convert java object to JSON format -> fromJson() – convert JSON into java object import com.google.gson.Gson; public class  You can use the JSON.parse() method in JavaScript, to convert a JSON string into a JSON object. JSON is a commonly used data format for exchanging data between a server and web applications. It can be used in a variety of ways and today I am sharing an example here, which shows how to convert a JSON string data to a JSON object in JavaScript.


I'm not sure about other ways to do it but here's how you do it in Prototype (JSON tutorial).

new Ajax.Request('/some_url', {
  method:'get',
  requestHeaders: {Accept: 'application/json'},
  onSuccess: function(transport){
    var json = transport.responseText.evalJSON(true);
  }
});

Calling evalJSON() with true as the argument sanitizes the incoming string.

javascript - Safely turning a JSON string into an object, 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. JSON.parse () parses a string as JSON, so it will take in a string value and output a JSON value. Ergo, it’s the opposite of JSON.stringify (). That’s enough stringification fun for now. Manipulating JSON into your string format is pretty easy to do, but as always, if you’re still stuck, drop us a line below.


jQuery.parseJSON(), parse() takes a JSON string and then transforms it into a JavaScript object. Let's take a look at a code example: JSON.stringify() can take additional  Then JSON.stringify converts from an object back to a (valid) JSON string. Calling eval is dangerous if the string is not from a trusted source because it could literally run any JavaScript which opens up the possibility of cross-site scripting attacks.


How can I convert String to JSON object in Java?, The JSON.parse () method parses a JSON string, constructing the JavaScript value or object described by the string. An optional reviver function can be provided to perform a transformation on the resulting object before it is returned. The source for this interactive example is stored in a GitHub repository.


Safely turning a JSON string into an object?, A valid syntax to safely turning a JSON string into an object shall be: var object = JSON.decode(string[, secure]); Moreover a JSON Request is can raise an object that able to parse directly.