Looking for a good and well documented Java library for Base64url encoding + decoding?
Apache Commons Codec does it: http://commons.apache.org/codec/
import org.apache.commons.codec.binary.Base64; // to encode into Base64url byte b64data = Base64.encodeBase64URLSafe(binaryData); // to decode a Base64url byte binaryData = Base64.decode(b64data);
Base64url was created to allow safe use of base64 encoded data in URL strings. This is done by avoiding ‘=’ padding at the end and emitting ‘-‘ and ‘_’ instead of the usual ‘+’ and ‘/’ characters.
Base64url is used to encode JSON Web Tokens (JWT).