The proto-lens library provides an API for protocol buffers using modern Haskell language and library patterns. Specifically, it provides:

• Composable field accessors via lenses
• Simple field name resolution/overloading via type-level literals
• Type-safe reflection and encoding/decoding of messages via GADTs

Links for more information:

• Tutorial
• Build instructions
• Installing protoc
• Reference table of scalar types used by generated code
• List of reserved variable names

This is not an official Google product.