<head>
    <script src="jquery-1.8.0.min.js" type="text/javascript"></script>
    <script src="jquery.json-2.4.js" type="text/javascript"></script>
  </head>


var str = {
            ApiName: 'sc.ps.getHouseIdentityByDigitalCode',
            AppKey: 'EFB4A705E64DF0289C6EB1E330A93149',
            AppSecret: 'F593701D226604AF31FC263FD82A2A68',
            AppSession: "null",
            Parmeters: ["10188001300010780"]  
        };

var jsonStr = $.toJSON(str);
        
var name = $.evalJSON( jsonStr ).ApiName;
alert(name);