grpcurl

What grpcurl is

grpcurl is a free command-line tool for interacting with gRPC servers and invoking RPC methods. It accepts JSON request messages and converts them to protobuf binary format, making it useful for people and scripts. Its list and describe commands show services, methods, and schema descriptions. grpcurl can discover schemas through server reflection or use .proto source files or compiled protoset files; when a server lacks reflection, one of those files is required. It supports streaming RPCs, including interactive bidirectional streaming through a terminal and stdin. Connections can use TLS or plaintext, with TLS configuration options and mutual TLS client certificates. The tool is available on Linux, macOS, and Windows, and can also be used in self-hosted environments. Installation options documented by the project include release binaries, Homebrew, Docker, Snap, source installation, and third-party packages. The repository identifies its license as MIT and provides a Go library package for building command-line tools that dynamically invoke gRPC endpoints. The listed plan is free, with no paid plans or usage limits stated.