Clone this repo:


  1. 56786dc testing/prototest: refactor prototest API by Damien Neil · 9 days ago master
  2. fb5fde4 internal/impl: remove blocking TODO by Joe Tsai · 8 hours ago
  3. 929c287 internal/testprotos: add a missing Copyright header line by Damien Neil · 5 hours ago
  4. f26a9e7 all: rename IsInitialized as CheckInitialized by Joe Tsai · 9 hours ago
  5. 5e75048 all: fix license header by Joe Tsai · 7 hours 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.