ASP seems to lack a URL Decode function but has a URL Encode function available. Here is a function that can decode any URL Encoded URL or variable.

URLDecode.asp

<%
FUNCTION URLDecoder(str)
'// This function:
'// - decodes any utf-8 encoded characters into unicode characters eg. (%C3%A5 = å)
'// - replaces any plus sign separators with a space character
'//
'// IMPORTANT:
'// Your webpage must use the UTF-8 character set. Easiest method is to use this META tag:
'// <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
'//
    Dim objScript
    Set objScript = Server.CreateObject("ScriptControl")
    objScript.Language = "JavaScript"
    URLDecoder = objScript.Eval("decodeURIComponent(""" & str & """.replace(/\+/g,"" ""))")
    Set objScript = NOTHING
END FUNCTION
%>

This function is great and simple and it really helped me in solving an issue I had with URL encoding.
But I do have one important note about it:
The name of the function should be change from URLDecode, as this is a built-in function in Classic ASP and unfortunately, there is no way to override an existing function (like in JavaScript, C and so on).
I would slightly change it to URLDecoder and that would easily solve the problem described here.
(*) Don't forget to change this name also inside the function (the return value)!

many thanks. it's simple and helpful.

Thanks from 2012 :) I'm surprised that Classic ASP doesn't have URL decoding.

🤌🤌🤌🤌🤌