JSFiddle - React, Tailwind, and code Playground

JavaScript

var data1 = "{" + 
    "    \"AppName\": \"TheName\", " + 
    "    \"AppUrl\": \"https:\/\/app\/icons\/unknown.png\", " + 
    "    \"aGUID\": \"45c055d2-2edc-d4444\", " + 
    "    \"DateCreated\": \"8\/23\/2012 11:04AM\", " +
    "    \"foo\": { " + 
    "        \"ID\": \"yser123\", " + 
    "        \"Name\":\"User\"" + 
    "    }" + 
    "}";

var data2 = '{' + 
    '    "AppName": "TheName", ' + 
    '    "AppUrl": "https:\/\/app\/icons\/unknown.png", ' + 
    '    "aGUID": "45c055d2-2edc-d4444", ' + 
    '    "DateCreated": "8\/23\/2012 11:04AM", ' +
    '    "foo": { ' + 
    '        "ID": "yser123", ' + 
    '        "Name":"User"' + 
    '    }' + 
    '}';

var data3 = "{" + 
    "    'AppName': 'TheName' " + 
    "    }";

var obj1 = JSON.parse(data1);
var obj2 = JSON.parse(data2);
var obj3 = JSON.parse(data3);

alert( obj1.AppName );
alert( obj2.AppName );
alert( obj3.AppName );