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Go.mod file

As explained in Learn Go with Pocket-Sized Projects

go.mod is a Go module definition file that declares a module's path and dependency requirements.

A go.mod file identifies a Go module and anchors the project to a module path. Create it while starting a project with go mod init. section 2.1 section 8.1.2

Use a repository path when the project will be shared:

  • Create a directory, enter it, and run go mod init followed by the chosen module name. section 2.1
  • Prefer the full repository path as the module name when publishing code. section 8.1.2
  • Confirm that initialization produced a new go.mod file before writing the application. section 2.1
> go mod init example.com/your-repository

Run go mod init with a repository-style path to create the module definition. section 2.1

How Learn Go with Pocket-Sized Projects covers it

How deep it goes
Explains creation and module naming, but does not detail dependency declarations or broader file syntax.
Examples
Uses hello-world and HTTP service projects initialized with learngo-pockets/hello and learngo/httpgordle.
What it assumes
Assumes basic command-line use and teaches module initialization from a newly created project directory.
What you can do after
Operate/configure a new Go project by creating its go.mod file with go mod init.
How it connects
Connects Go modules with packages, repository paths, and executable services.

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This explainer was generated by Manning's knowledge graph from the text of Learn Go with Pocket-Sized Projects. The section links point to the parts of the book it draws on.