decodeUtf8 static method
Decodes a Base64url Encoding value into a String.
The encoded
string is decoded as a Base64url Encoding, and then those
sequence of bytes are interpreted as a UTF-8 encoded string.
Throws FormatException if it is not Base64url Encoding or does not contain a UTF-8 encoded string.
Implementation
static String decodeUtf8(String encoded) => utf8.decode(decode(encoded));