Clone this repo:


  1. 2c870bb internal/impl: implement oneof fields by Joe Tsai · 4 days ago master
  2. ba1159f protogen: move comment generation into protogen by Damien Neil · 4 days ago
  3. 3903b21 reflect/protoreflect: remove List method by Joe Tsai · 4 days ago
  4. bbfaeb7 internal/impl: implement Map fields by Joe Tsai · 5 days ago
  5. 91e1466 internal/impl: implement Vector fields by Joe Tsai · 5 weeks ago

Next Generation Go Protocol Buffers

WARNING: This repository is in active development. There are no guarantees about API stability. Breaking changes will occur until a stable release is made and announced.

This repository is for the development of the next major Go implementation of protocol buffers. This library makes breaking API changes relative to the existing Go protobuf library. Of particular note, this API aims to make protobuf reflection a first-class feature of the API and implements the protobuf ecosystem in terms of reflection.

Design Documents

List of relevant design documents:


We appreciate community contributions. See

Reporting Issues

Issues regarding the new API can be filed at Please use a APIv2: prefix in the title to make it clear that the issue is regarding the new API work.