How To Convert Unicode String To Proper String (Chinese language) in Flutter

Your string is in escaped unicode format. If it is always in this format you can simply strip out the escaping U characters and convert the hex to code points.

  var original = 'u9c9cu82b1u548cu7231';

  // split on 'u' and remove the first empty element
  var parts = original.split('u')..removeAt(0);

  // map from hex string to code point int, and create string
  print(String.fromCharCodes(
    parts.map<int>((hex) => int.parse(hex, radix: 16)),
  ));