BASE64 constant
BASE64 = const Base64Codec()A base64 encoder and decoder.
It encodes using the default base64 alphabet, decodes using both the base64 and base64url alphabets, does not allow invalid characters and requires padding.
Examples:
var encoded = BASE64.encode([0x62, 0x6c, 0xc3, 0xa5, 0x62, 0xc3, 0xa6, 0x72, 0x67, 0x72, 0xc3, 0xb8, 0x64]); var decoded = BASE64.decode("YmzDpWLDpnJncsO4ZAo=");
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https://api.dartlang.org/stable/1.24.3/dart-convert/BASE64-constant.html