Im unable to convert the xml to json

im given this task to convert the xml return by this api dwinnex.com/feed/ into json. I have tried using { parseString } from “xml2js” (a npm package) but it returns an exception, also i tried using this online converter codebeautify.org/xmltojson and its also gives an error. I think maybe its not possible to convert this to json because maybe its not xml.
Can someone please have a look and see if the data returned by the API is actually convertible to JSON?