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Portable Dart package to handle data serialization/deserialization efficiently, including a dynamic BytesBuffer to read/write data.

API Documentation

See the API Documentation for a full list of functions, classes and extension.


import 'package:data_serializer/data_serializer.dart';

void main() {
  // Dynamic bytes buffer with initial capacity of 16 bytes.
  var buffer = BytesBuffer(16);

  // Write a unsigned int of 32 bits:

  // Write a `String` encoded using UTF-8:

  // Write a unsigned int of 64 bits:

  // Write a data block (prefixed by 4 bytes for he data length).
  var dataBlock = [110, 120, 130, 140, 150, 160].toUint8List();

  // Write all bytes:
  buffer.writeAll([210, 220]);

  // The current length of the buffer, expanded automatically:
  print('length: ${buffer.length}');

  // Change the current position cursor to `0`:;

  // Read a 32 bits int:
  var n32 = buffer.readUint32();
  print('n32: 0x${n32.toHex32()}');

  // Reads a `String` decoding from UTF-8:
  var s = buffer.readString();
  print('s: $s');

  // Read a 64 bits int:
  var n64 = buffer.readUint64();
  print('n64: $n64');

  // The current buffer position:
  print('position: ${buffer.position}');

  // Read a data block:
  var dataBlock2 = buffer.readBlock32();
  print('dataBlock2: $dataBlock2');

  // The position after read the data block:
  print('position: ${buffer.position}');

  // The remaining bytes in the buffer:
  var tailBytes = buffer.readRemainingBytes();
  print('tailBytes: $tailBytes');


length: 34
n32: 0x10203040
s: Hello!
n64: 9223372036854775807
position: 22
dataBlock2: [110, 120, 130, 140, 150, 160]
position: 32
tailBytes: [210, 220]

Browser/JavaScript compatibility

All the operations are tested to be compatible with JavaScript.

Note that JS only supports 53-bits integers. To avoid any issue serializing 64-bits integers, try to use BigInt serialization, or ensure that you are bellow the 53-bits range.

See the class DataSerializerPlatform if you need runtime information about integers support.

Test Coverage


This package aims to always have a high test coverage percentage, over 95%. With that the package can be a reliable tool to support your important projects.


The official source code is hosted @ GitHub:

Features and bugs

Please file feature requests and bugs at the issue tracker.


Any help from the open-source community is always welcome and needed:

  • Found an issue?
    • Please fill a bug report with details.
  • Wish a feature?
    • Open a feature request with use cases.
  • Are you using and liking the project?
    • Promote the project: create an article, do a post or make a donation.
  • Are you a developer?
    • Fix a bug and send a pull request.
    • Implement a new feature.
    • Improve the Unit Tests.
  • Have you already helped in any way?
    • Many thanks from me, the contributors and everybody that uses this project!

If you donate 1 hour of your time, you can contribute a lot, because others will do the same, just be part and start with your 1 hour.


Graciliano M. Passos: gmpassos@GitHub.


Apache License - Version 2.0


Library to handle data serialization/deserialization efficiently.
Library to handle data serialization/deserialization efficiently with dart:io support.