Intermediate

Build a gRPC Service

Define a service in Protocol Buffers, generate typed Go clients and servers, and implement unary and streaming RPCs.

~6h

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Intro

Before We Start

Prerequisites: Build a REST API in Go; protoc (Protocol Buffer compiler) installed.

Version note: verified against current docs as of July 2026, targeting the common Go 1.25/1.26 feature set. grpc-go's own compatibility policy supports any one of the two latest major Go releases, so on Go 1.25 or 1.26 you're in the supported window either way.

gRPC defines the contract once in a .proto file and generates strongly-typed client and server code in Go (and every other supported language) from it, over HTTP/2, with built-in support for streaming in both directions. This project defines a small inventory service, generates its Go bindings, implements both a unary RPC and a server-streaming RPC, and wires up a client to call it.

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Install the protoc plugins and define the service

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Generate and implement the server

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Implement a server-streaming RPC

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Secret Mission

Secret Mission: Add an interceptor

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Wrap Up

Before You Go

Pro

Test what you just learned

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