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Go Modules

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What Go Modules is

Go Modules is a free dependency manager for Go projects. It organizes packages into modules that are released, versioned, and distributed together. Each module has a UTF-8 encoded go.mod file at its root, declaring the module path and dependency information. Modules normally use semantic versions in major, minor, and patch form. Minimal version selection keeps chosen versions consistent for reproducible builds, while commands that load the module graph can update go.mod when required. A go.work file allows a workspace to use multiple modules. Dependencies may come from version-control repositories or module proxy servers, with GOPROXY controlling proxy behavior. Go 1.13 and later users default to the public Go module mirror. Downloaded hashes are checked against go.sum and mismatches stop installation with a security error; a public checksum database supplies verification entries. Private modules can be configured with settings such as GOPRIVATE and GONOPROXY. Go Modules support dependency resolution, lockfiles, workspaces, private registry authentication, and offline installation. The open-source Go project is distributed under a BSD-style license.

Who it suits

Go developers who need versioned dependency management, reproducible builds, workspaces, or private-module configuration. It suits projects targeting supported Go systems, including Linux, macOS, Windows, Android, and iOS.

What it does well

  • Free plan
  • Reproducible builds through minimal version selection
  • Workspace support with go.work
  • Private module configuration
  • Offline installation support

What to know first

  • Toolchain rejects modules declaring newer Go versions
  • Requires go.mod module metadata

Verdict

Go Modules provides Go projects with structured dependency metadata, version selection, verification, and workspace support. Its free, open-source distribution suits teams that need reproducible or private dependency workflows.

Facts from Go Modules's own pages

Automatic updates
Commands that load the module graph automatically update go.mod when needed. · go.dev, 1 Oct 2026
Checksum database
The public checksum database provides a global source of go.sum lines to verify module contents. · go.dev, 1 Oct 2026
Compatibility requirement
Since Go 1.21, a toolchain refuses to use a module that declares a newer Go version than the toolchain supports. · go.dev, 2 Oct 2026
Dependency file
Each module is defined by a UTF-8 encoded go.mod file in its root directory. · go.dev, 1 Oct 2026
Dependency metadata
A module is identified by its module path, declared in a go.mod file together with information about its dependencies. · go.dev, 2 Oct 2026
Dependency resolution
Yes · go.dev, 21 Sept 2026
Dependency sources
Modules may be downloaded directly from version control repositories or from module proxy servers. · go.dev, 2 Oct 2026
Free plan
Yes · go.dev, 21 Sept 2026
Integrity verification
Downloaded module hashes are checked against go.sum and mismatches produce a security error without installing the file. · go.dev, 1 Oct 2026
License
Go is an open source project distributed under a BSD-style license. · go.dev, 1 Oct 2026
Lockfile support
Yes · go.dev, 21 Sept 2026
Module model
A module is a collection of packages released, versioned, and distributed together. · go.dev, 1 Oct 2026
Module proxy
The go command defaults to downloading modules from the public Go module mirror for Go 1.13 and later module users. · go.dev, 1 Oct 2026
Module structure
A module is a collection of packages that are released, versioned, and distributed together. · go.dev, 2 Oct 2026
Offline installation
Yes · go.dev, 21 Sept 2026
Origin
Go was created at Google in 2007 and released publicly in November 2009. · go.dev, 1 Oct 2026
Package formats
Go modules,module ZIP files · go.dev, 21 Sept 2026
Private dependencies
The Go Modules reference documents environment variables including GOPRIVATE and GONOPROXY for controlling module lookup behavior. · go.dev, 2 Oct 2026
Private modules
The go command can download and build modules from private sources with configuration such as GOPRIVATE and GOPROXY. · go.dev, 1 Oct 2026
Private registry auth
Yes · go.dev, 21 Sept 2026
Project and license
Go is an open source project developed by a team at Google and community contributors, and is distributed under a BSD-style license. · go.dev, 2 Oct 2026
Proxy configuration
The go command's GOPROXY setting can specify proxy URLs or the keywords direct or off. · go.dev, 2 Oct 2026
Purpose
Go modules are how Go manages dependencies. · go.dev, 2 Oct 2026
Reproducible builds
Minimal version selection provides consistent module versions and 100% reproducible builds. · go.dev, 1 Oct 2026

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