Clone this repo:


  1. c600d6c all: do best-effort initialization check on fast path unmarshal by Damien Neil · 2 days ago master
  2. d30e561 proto: add MarshalState, UnmarshalState by Damien Neil · 17 hours ago
  3. f0831e8 internal/impl: change unmarshal func return to unmarshalOptions by Damien Neil · 2 days ago
  4. 61781dd all: abstract fast-path marshal and unmarshal inputs and outputs by Damien Neil · 2 days ago
  5. f12fb45 all: add ProtoMethods method to protoreflect.Message by Damien Neil · 2 days 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.