can not get json output from custom js library

Content

I am trying to convert to xml response to JSON format and return it as json format but oic js function only support string output. Consuqently we are getting this response:

"[{

\"ORDER_NO\":xxxx,

\"FULFILL_LINE_ID\":xxxxx,

\"LINE_NUMBER\":\"1-1:\"

}]"

but we want to JSON format like this

[{

"ORDER_NO":xxxx,

"FULFILL_LINE_ID":xxxxx,

"LINE_NUMBER":"1-1:"

}]

how can we achive that?

I upload SS of mapping response, oic export  js code for convertion

 

 

Code Snippet

function base64Decode(xml) {
    // Create the return object
	//xml=xml.replace('\\n','');
    //xml=xml.replace('\\"','"');
	var response = [];
	var pos=xml.indexOf('<G_1>');
	var i=0;
	while(pos!=-1)
	{
		xml=xml.substr(pos+5);
		xml=xml.substr(xml.indexOf('<'));
		var obj={},key='',value='';
		while(xml.substr(0,6)!='</G_1>')
		{
			key=xml.slice(1,xml.indexOf('>'));
			xml=xml.substr(xml.indexOf('>')+1);
			value=xml.slice(0,xml.indexOf('<'));
			xml=xml.substr(xml.indexOf('>')+1);
			xml=xml.substr(xml.indexOf('<'));
			i++;
			//console.log(xml.substr(0,6));
			if(/^-?[\d.]+(?:e-?\d+)?$/.test(value))
				obj[key]=Number(value);
			else
				obj[key]=value;
		}
		response.push(obj);
		pos=xml.indexOf('<G_1>');
	}
	var obj=JSON.stringify(response);
    return obj;
};