gistfile1.dart

import 'dart:typed_data';
import 'dart:convert'; 


void main() {
  final j = {'k' : 'ජෝන්', 'non_unicode': 'abc'};
 
  /// Existing Version
  final oldencoded = json.encode(j);
  final oldutfencoded = Uint8List.fromList(oldencoded.codeUnits);
  final oldutfdecoded = String.fromCharCodes(oldutfencoded);
  final olddecoded = json.decode(oldutfdecoded);

  print(j['non_unicode'] == olddecoded['non_unicode']); // True
  print(j['k'] == olddecoded['k']); // False
  print(j.toString() == olddecoded.toString()); // False
 
 
  /// New Version
  final encoded = json.encode(j);
  final utfencoded = utf8.encoder.convert(encoded);
  final utfdecoded = utf8.decoder.convert(utfencoded);
  final decoded = json.decode(utfdecoded);
 
  print(j['non_unicode'] == decoded['non_unicode']); // True
  print(j['k'] == decoded['k']);  // True
  print(j.toString() == decoded.toString()); // True
}