I have some web services that receive JSON data send by jquery method. But I need to edit the object before send this data. Is there any way to parse a JSON object to a simple object in javascript, modify it and then parse it again to JSON. or maybe update this JSON object without parse it?

I have some web services that receive JSON data send by jquery method. But I need to edit the object before send this data. Is there any way to parse a JSON object to a simple object in javascript, modify it and then parse it again to JSON. or maybe update this JSON object without parse it?

• javascript
• json

• I realized that is a string, I had to use JSON.Parse to get the JSON object – jcvegan Commented Jan 5, 2012 at 21:40

5 Answers 5

To go from a JSON string to a JavaScript object: JSON.parse, or $.parseJSON if you're using jQuery and concerned about patibility with older browsers.

To go from a JavaScript object to a JSON string: JSON.stringify.

If I've already do this var myData = JSON.stringify({ oJson:{data1 :1}}); and then I want to update that information setting data1 = 2, what is the best way to do this?

var myData = JSON.stringify({ oJson:{data1 :1}});
// later...
parsedData = JSON.parse(myData);
parsedData.oJson.data1 = 2;
myData = JSON.stringify(parsedData);

Even better though, if you save a reference to the object before stringifying it, you don't have to parse the JSON at all:

var obj = { oJson:{data1 :1}};
var myData = JSON.stringify(obj);
// later...
obj.oJson.data1 = 2;
myData = JSON.stringify(obj);

var parsed = JSON.parse('{"a": 1}');
parsed.b = 2;
var string = JSON.stringify(parsed);
//string is: '{"a":1,"b":2}'

I think something like the following should work...

//Convert your JSON object into a JavaScript object
var myObject = JSON.parse(json);

//You can then manipulate the JavaScript object like any other
myObject.SomeValue = "new";

//Then you can convert back to a JSON formatted string
json = JSON.stringify(myObject);

As JSON is an JavaScript object you can simply manipulate it with JavaScript.

You could do something like this to get a javascript object:

var jsObject = JSON.parse(jsonString);

Then you could modify jsObject and turn it back into a JSON string with JSON.stringify.

This page has more information on it.