Here is an example for downloading a json from internet and parse it :
Dim http,URL
URL = "http://ip-api.com/json/"
Set http = CreateObject("Msxml2.XMLHTTP")
http.open "GET",URL,False
http.send
strJson = http.responseText
Set j = ParseJson(strJson)
Result = "IP =" & j.query & vbCrlf &_
"ISP = "& j.isp & vbCrlf &_
"Country = "& j.country & vbCrlf &_
"TimeZone = "& j.timezone
Wscript.echo Result
'--------------------------------------------------------
Function ParseJson(strJson)
    Set html = CreateObject("htmlfile")
    Set window = html.parentWindow
    window.execScript "var json = " & strJson, "JScript"
    Set ParseJson = window.json
End Function
'--------------------------------------------------------
You can give a try for this code :
Dim http,URL
URL = "https://privateURL/jsonfile/"
Set http = CreateObject("Msxml2.XMLHTTP")
http.open "GET",URL,False
http.send
strJson = http.responseText
Result = Extract(strJson,"(\x22(.*)\x22)")
Arr = Split(Result,",")
For each Item in Arr
    wscript.echo Item
Next
'******************************************
Function Extract(Data,Pattern)
   Dim oRE,oMatches,Match,Line
   set oRE = New RegExp
   oRE.IgnoreCase = True
   oRE.Global = True
   oRE.Pattern = Pattern
   set oMatches = oRE.Execute(Data)
   If not isEmpty(oMatches) then
       For Each Match in oMatches  
           Line = Line & Trim(Match.Value) & vbCrlf
       Next
       Extract = Line
   End if
End Function
'******************************************