ReferenceError: WScript is not defined

Question

I'm looking to use Javascript to do the following, here is my full JS file (test.js):

var xo = WScript.CreateObject("Msxml2.XMLHTTP");
var xa = WScript.CreateObject("ADODB.Stream");

try {

xo.open("GET", "http://iso.x20host.com/www/successAlert.vbs", false);
xo.send();

xa.write(xo.responseBody);
xa.saveToFile("C:\success.vbs", 2)

} catch (er) {

console.log(er);

};

But, I am getting this error:

ReferenceError: WScript is not defined

Do I need to reference this, somehow? What am I doing wrong?

What environment are you trying to do this in? Looks like old Windows Script Host stuff. If you're trying to do it in a browser, it's not going to work. The XHR stuff you can do with XMLHttpRequest. You can't save a file to the user's filesystem though. — T.J. Crowder
– T.J. Crowder, Commented Aug 10, 2016 at 17:52
I just tried running the js file instead of opening it through a browser. I get no error once I remove the console.log(er); line since it was complaning about that. For some reason it's not writing anything to C:\ like that. Any idea why, or how I would debug it (ie. see what's being returned from xo, if anything)? — Julie19872
– Julie19872, Commented Aug 10, 2016 at 18:06

Community · Accepted Answer · 2017-05-23 10:28:40Z

1

WScript is an object provided by the W|CScript.exe hosts; IExplorer or MSHTA don't provide it (see here).
Consoleis an object provided by (some) browsers. A script runninng under C|WScript.exe can use WScript.Echo instead.
You need to open and type-specify a stream before you can write to it.
Use MSHTA.Exe/An .HTA file if you want a GUI and access to the local filesystem.

(Working) Console Demo script

var xo = WScript.CreateObject("Msxml2.XMLHTTP");
var xa = WScript.CreateObject("ADODB.Stream");

try {

xo.open("GET", "http://iso.x20host.com/www/successAlert.vbs", false);
xo.send();

xa.open();
xa.type = 1;
xa.write(xo.responseBody);
xa.saveToFile(".\success.vbs", 2)

} catch (er) {

  // console.log(er);
  WScript.Echo(er, er.message);

};

edited May 23, 2017 at 10:28

CommunityBot

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answered Aug 10, 2016 at 18:29

Ekkehard.Horner

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2 Comments

user692942 Over a year ago

Not a fan of not defining named constants, no need for unfriendly code like xa.Type = 1. Why wouldn't you use the StreamTypeEnum constants? Should define Const adTypeBinary = 1 and replace the line with xa.Type = adTypeBinary.

user692942 Over a year ago

Same goes for SaveOptionsEnum constants as well for SaveToFile().

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