How to Use Google Wire for Dependency Injection in Go

Google Wire is a code generation tool for dependency injection in Go, not a standard library, requiring installation via go install and configuration in a wire.go file.

Google Wire is not a standard Go library and is not included in the Go source code provided; use the official github.com/google/wire module instead. To use it, install the tool, define your dependencies in a wire.go file, and generate the wiring code.

go install github.com/google/wire/cmd/wire@latest
wire

Install the Wire tool by running the install command above.
Create a wire.go file in your package to define providers and injectors using wire.Build.
Run wire in your module directory to generate the wire_gen.go file containing the dependency injection logic.

Google Wire is a tool that automatically generates code to connect your Go dependencies, so you don't have to write the wiring logic by hand. Think of it like a blueprint that tells a builder exactly how to assemble a house, ensuring every part connects correctly without manual effort. You use it when your application has many components that rely on each other and you want to avoid messy, error-prone setup code.