Parsing JSON in ActionScript (Adobe Flex). JSON.decode(string) returns null

Question

I am trying to parse JSON file in my Flex project. I included as3corelib.swc and imported com.adobe.serialization.json.JSON, but JSON.decode() function still returns null. What might be the problem?

[Embed(source="assets/test.json",mimeType="application/octet-stream")]
private var json_file:Class;

public function load():void
{
    var bytes:ByteArray = new json_file();
    var json:String = bytes.readUTFBytes(bytes.length);
    trace(json); // String is OK!
    var arr:Array = (JSON.decode(json) as Array);
    trace(arr); // Array is null!
}

I also tried:

    var str:String = (JSON.decode(json) as String);
    trace(arr); // null!

and:

    var arr:Object = JSON.decode(json); // [object Object]
    trace(arr.toString()); // empty string

Thanks for your time.

Could be either bad JSON, or you aren't using it properly. JSON uses key-value pairs and is always decoded into an object which has properties. You should access the decoded object as Object.someKey to get the data. — J_A_X
– J_A_X, Commented Jun 15, 2011 at 17:45
You are right J_A_X. I can access elements with: trace(arr.GlossEntry[0].Acronym.toString()); — Jacek
– Jacek, Commented Jun 15, 2011 at 17:58

Thirumalai murugan · Accepted Answer · 2013-03-23 06:32:16Z

3

In flex 4.5 it become parse instead of decode

var obj:Object=JSON.parse(json);

answered Mar 23, 2013 at 6:32

Thirumalai murugan

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Dinesh · Accepted Answer · 2012-12-21 07:11:41Z

2

Try this also working

var arr:Array = (JSON.decode(json) as Array);
for (var keyname:String in arr)
{
trace ( keyname + ": " + arr[ keyname ] );          
}

answered Dec 21, 2012 at 7:11

Dinesh

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Comments

Jacek · Accepted Answer · 2011-06-15 18:06:09Z

1

Problem solved thanks to J_A_X (see comments to the question). Elements can be accessed by key. Example:

var obj:Object = JSON.decode(json);
trace(obj.GlossEntry[0].Acronym.toString());

edited Jun 15, 2011 at 18:06

answered Jun 15, 2011 at 17:59

Jacek

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