Why Does My Go Project Show a 'Malformed Module Path' Error After Switching from GOPATH to Go Modules?

Malformed Module Path "my-api-server/my-utils/uuid" When Migrating from GOPATH-Based Dep to Go Mod

When migrating from GOPATH-based dep to Go mod, you may encounter the following error:

$ go version
1.13.3

$ go run main.go
build command-line-arguments: cannot load my-api-server/my-utils/uuid: malformed module path "my-api-server/my-utils/uuid": missing dot in first path element

Cause:

The error occurs because the first part of the module path, "my-api-server," is not a valid domain or path with a period (".").

Solution:

To resolve this issue, you need to create a "go.mod" file at the root of your project (e.g., "my-api-server/go.mod"). The go.mod file should contain the following information:

• Module Path: The full path to your module, including the domain/path and project name. For example, if your GitHub username is "your-github-username," the module path would be "github.com/your-github-username/my-api-server."
• Module Requirements: If you have dependencies in other modules, you can include "require" statements to specify them. However, since the "uuid" package is in the same module as "main.go," you do not need a "require" statement.

Once you have created the go.mod file, you can import the "uuid" package using the full module path, like so:

import "github.com/your-github-username/my-api-server/my-utils/uuid"

Additional Tips:

• Use "go build" to create an executable instead of "go run" to ensure all necessary files are included.
• Refer to the Go blog post linked below for a comprehensive guide on using Go modules.

https://blog.golang.org/using-go-modules

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