https://web.archive.org/web/20110422225659/https://en.wikipedia.org/wiki/Base64#URL_applications talks about base64Url – Decode a modified Base64 for URL variant exists, where no padding ‘=’ will be used, and the ‘+’ and ‘/’ characters of standard Base64 are respectively replaced by ‘-‘ and ‘_’ I created the following function: it returns a very small set of characters that don’t even resemble to the expected results. any ideas? Answer