Initialize a Go module and manage dependencies with go mod init, go get, and go mod tidy
domain: go.dev · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
In the project root run `go mod init <module-path>` (e.g. go mod init github.com/org/app) — this writes go.mod.
Add or change a dependency version: `go get example.com/pkg@latest` or `go get example.com/pkg@v1.2.3`. `go get -u ./...` upgrades existing deps to newest minor/patch versions.
To drop a dependency, delete its imports from the source and run `go mod tidy` — tidy adds any missing requirements and removes unused ones, updating go.sum.
Commit BOTH go.mod and go.sum; go.sum holds cryptographic checksums the toolchain uses to verify downloads.
Docs: https://go.dev/ref/mod
Known gotchas
`go mod init` fails if go.mod already exists ('go.mod already exists') — there is no --force; edit or remove the file instead.
Module paths for v2+ of a module must end in /v2 (etc.); tagging v2.0.0 without the suffix breaks consumers.
go mod tidy considers all build tags and platforms, so it may keep requirements your current GOOS never compiles.
`go get -u` walks transitive dependencies and can pull in many upgrades at once; prefer targeted `go get pkg@version` for controlled bumps.
Never hand-edit go.sum; if it drifts, delete offending lines and re-run `go mod tidy`.
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