Convert from and to base64 a String in dart

base64_mixin.dart

import 'dart:convert';

/// Manage conversion to and from base 64
mixin Base64Mixin {
  /// Converts a [dynamic] data from plain [String] to base64
  String toBase64(dynamic data) => base64.encode(utf8.encode(jsonEncode(data)));

  /// Converts a [dynamic] data from base64 to plain [String]
  String fromBase64(dynamic data) => utf8.decode(base64.decode(data as String));
}