How to parse Json file in android?

Thanks to any response.

I've met some problem with parse the Json file of Facebook's Graph API in Unity, the codes can run well in the platform of PC but of Android, it met with some error code as " Type 'Object' doesn't support slicing", the codes below is what I used to parse the Json file of Facebook

=====================

import System.Globalization;

var url :String =""; private var encoding: System.Text.UnicodeEncoding;

function Start () { // Start a download of the given URL var www : WWW = new WWW (url);

 // Wait for download to complete
 yield www;

 var t1: String=convertEscString(www.text);
 var hh: Hashtable = eval(t1);

 for (var i: int=0; i<hh["data"].length; i++)
 {
     Debug.Log("name="+hh["data"][i]["name"]+" id="+hh["data"][i]["id"]);
 }

}

====================

the problem seems like Unity with Android platform cannot work with the Object of Hashtable?

Really really wanna some help to make Unity android work with JSON well, thanks to any response and help.