Express gRPC Transcoder

Express middleware that transcodes JSON HTTP requests to gRPC and vice versa, similar to grpc-gateway but as a Node.js library. Current stable version is 0.4.0, with active development. It allows Express apps to serve a gRPC service via HTTP/1.1 JSON without an external proxy. Handles protocol buffer metadata, streaming, and error mapping. Differentiators: pure JavaScript, zero external proxy dependency, full TypeScript support, works with any gRPC service definition.