Need UUIDs that are shorter and URL safe? UUID -> hex bytes -> Base64Url

main.dart

import 'dart:convert';

import 'package:uuid/uuid.dart';

void main(List<String> arguments) {
  final uuid = "57290fdf-790f-4894-859e-3db0ae087f0e";

  final codec = ShortUuidCodec();
  final encodedUuid = codec.encode(uuid);
  final decodedUuid = codec.decode(encodedUuid);

  print(encodedUuid); // VykP33kPSJSFnj2wrgh_Dg==
  print(decodedUuid); // 57290fdf-790f-4894-859e-3db0ae087f0e
}

/// Converts between a UUID and the shortest possible Base64Url String
class ShortUuidCodec extends Codec<String, String> {
  static final _decoder = ShortUuidDecoder();

  static final _encoder = ShortUuidEncoder();

  @override
  Converter<String, String> get decoder => _decoder;

  @override
  Converter<String, String> get encoder => _encoder;
}

/// Encodes a UUID to the shortest possible Base64Url String
class ShortUuidEncoder extends Converter<String, String> {
  @override
  String convert(String input) {
    final bytes = Uuid.parse(input);
    return base64Url.encode(bytes);
  }
}

/// Decodes a "shortest possible" Base64Url encoded UUID String
class ShortUuidDecoder extends Converter<String, String> {
  @override
  String convert(String input) {
    final decoded = base64Url.decode(input);
    return Uuid.unparse(decoded);
  }
}

Dope