How to decode Json using native JSON or actionjson in Flex 3

If the fastest parser is what you want, then you'll want use native JSON parsing. Its usage is as simple as this:

var result:Object = JSON.parse(event.result);trace(result.workflow.template);  //traces "Analysis1"

The JSON class is located in the root package, so no need to import anything. You can find information on its usage in the docs.

However native JSON is only available for Flash Player 11 or higher, which means you'll have to target at least that player version. Since your compiling a Flex 3 application, it will target Flash Player 9 by default. If your requirements don't prohibit you from targeting FP11+, the easiest fix is to compile with the Flex 4.6 (or higher) SDK. The screenshot in your question shows that you're using Flex 3.5, so you'll have to change that in the "build path" settings.

If you wish to traverse the resulting object dynamically, you can do it with a simple 'for' loop:

//workflow is the root node of your structurevar workflow:Object = result.workflow;//iterate the keys in the 'workflow' objectfor (var key:String in workflow) {    trace(key + ': ' + workflow[key]);}//template: Analysis1//start: [Object]//host: [Object]//...

If you want to do it recursively, you can check whether a value is an Object or not:

if (workflow[key] is Object) {    //parse that node too}else {    //just use the value}

<?xml version="1.0" encoding="utf-8"?><mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"><mx:Script>    <![CDATA[        import com.adobe.serialization.json.JSON;               [Embed(source="assets/test.json",mimeType="application/octet-stream")]        private var json_file:Class;        protected function button1_clickHandler(event:MouseEvent):void        {                       trace("Hello from Flex Debugging!");            var bytes:ByteArray = new json_file();            var json:String = bytes.readUTFBytes(bytes.length);            trace(json);                        var arr:Object = JSON.decode(json);            for (var keyname:String in arr)            {                trace ( keyname + ": " + arr[ keyname ] );                      }               grid.dataProvider = arr;        }    ]]></mx:Script><mx:DataGrid id="grid" right="10" left="10" top="10" bottom="10">        <mx:columns>            <mx:DataGridColumn headerText="Name" dataField="name"/>            <mx:DataGridColumn headerText="Age" dataField="age"/>        </mx:columns>    </mx:DataGrid>    <mx:Button x="538" y="45" label="Get Json" click="button1_clickHandler(event)"/></mx:WindowedApplication>

test.json

{"name": "dibneg","age" : "67","sex": "female","imagePath": "kamil.jpg"}

After following solution from RIAstar, this is what I did (both Flex 3.5 compiler & 4.6 compiler code)

Flex 3.5 compiler using as3corelib.swc for JSON

import com.adobe.serialization.json.JSON;private var temp:String ='{"workflow":{ "template":"HeapDumpAnalysis",      "start":{       "instance":"HDA_run1",      "user":"symtest",       "date":"3-Mar-2012",        "timestamp":"1330948220475" },  "host":{        "name":"estilo",        "user":"symtest1",      "password":"symtest1",      "installpath":"",       "product":""    },  "javadump":{        "pid":"8989",       "corefilename":"",      "heapdump":"",      "stack":"",     "INFA_HOME":""  },  "mat":{ },  "email":{       "to":"vsatwik@informatica.com",     "subject":"",       "message":""    },  "end":{ }}}';private function test():void{    var obj = JSON.decode(temp);    var workflow:Object = obj.workflow;    for (var key:String in workflow) {        trace(key + ': ' + workflow[key] + (key is String) + ", " + (workflow[key] is String));    }}

output

javadump: [object Object]true, falsetemplate: HeapDumpAnalysistrue, truehost: [object Object]true, falseend: [object Object]true, falsemat: [object Object]true, falseemail: [object Object]true, falsestart: [object Object]true, false

Flex 4.6 compiler using native Json parsing

private var temp:String ='{"workflow":{ "template":"HeapDumpAnalysis",      "start":{       "instance":"HDA_run1",      "user":"symtest",       "date":"3-Mar-2012",        "timestamp":"1330948220475" },  "host":{        "name":"estilo",        "user":"symtest1",      "password":"symtest1",      "installpath":"",       "product":""    },  "javadump":{        "pid":"8989",       "corefilename":"",      "heapdump":"",      "stack":"",     "INFA_HOME":""  },  "mat":{ },  "email":{       "to":"ars@gmail.com",       "subject":"",       "message":""    },  "end":{ }}}';private function test():void{    var result:Object = JSON.parse(temp);    var workflow:Object = result.workflow;    for (var key:String in workflow) {        trace(key + ': ' + workflow[key] + (key is String) + ", " + (workflow[key] is String));    }}

output

javadump: [object Object]true, falsemat: [object Object]true, falseend: [object Object]true, falseemail: [object Object]true, falsehost: [object Object]true, falsestart: [object Object]true, falsetemplate: HeapDumpAnalysistrue, true