Further reading
To learn about contributing to Protovalidate, its technical foundations, and interesting uses of Protovalidate, we encourage you to explore the following.
Protovalidate on GitHub
Protovalidate is an open source project licensed under Version 2.0 of the Apache license.
Buf welcomes bug reports, suggested enhancements, and pull requests within any of its GitHub repositories.
Core repository
The core Protovalidate repository contains Protobuf definitions for its standard rules, extensibility, and violation messages. It also provides a library of custom rule examples, conformance tooling for runtime implementations, and a migration tool for protoc-gen-validate users.
Runtime repositories
Each of the following provides an idiomatic Protovalidate runtime that meets the specification enforced by the core repository's conformance tooling.
- protovalidate-go
- protovalidate-java
- protovalidate-python
- protovalidate-cc
- protovalidate-es (Coming soon!)
Language contributions welcome
Interested in adding support for another language? Check out our Contributing guidelines.
Common Expression Language (CEL)
Common Expression Language (CEL) is a lightweight, high-performance expression language designed to be embedded within applications.
Supporting Protobuf well-known types, calculations, and even transformations with a JavaScript-like syntax, CEL allows expressions like this.first_flight_duration + this.second_flight_duration < duration('48h') to evaluate consistently across languages.
All Protovalidate rules are based on CEL expressions.
Learn more at about CEL at cel.dev.
Community projects
FauxRPC
FauxRPC enables rapid development for Connect, gRPC, gRPC-Web, and REST by creating fake implementations of RPC services defined in Protobuf files. It doesn't just enforce Protovalidate rules: it uses your Protovalidate rules to generate its fake responses.
Learn more about Protovalidate in FauxRPC.