The `dart:convert` library contains an encoder and decoder for Base64 and Base64Url. However, they encode and decode Lists of integers, so for strings you also need to encode and decode in UTF-8. Rather than doing these two encodings separately, you can combine them with [`fuse`][1].
You need to have the following import:
import 'dart:convert';
## Base64
String credentials = "username:password";
Codec<String, String> stringToBase64 = utf8.fuse(base64);
String encoded = stringToBase64.encode(credentials); // dXNlcm5hbWU6cGFzc3dvcmQ=
String decoded = stringToBase64.decode(encoded); // username:password
Note that this is equivalent to:
String encoded = base64.encode(utf8.encode(credentials)); // dXNlcm5hbWU6cGFzc3dvcmQ=
String decoded = utf8.decode(base64.decode(encoded)); // username:password
## Base64Url
String credentials = "username:password";
Codec<String, String> stringToBase64Url = utf8.fuse(base64Url);
String encoded = stringToBase64Url.encode(credentials); // dXNlcm5hbWU6cGFzc3dvcmQ=
String decoded = stringToBase64Url.decode(encoded); // username:password
Again, this is equivalent to:
String encoded = base64Url.encode(utf8.encode(credentials)); // dXNlcm5hbWU6cGFzc3dvcmQ=
String decoded = utf8.decode(base64Url.decode(encoded)); // username:password
## See also
- [RCF 4648][2]
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[2]:
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