Since is not a standard, default file name in the Go ecosystem (unlike .env or .env.local ), this guide assumes you are looking to implement a specific configuration pattern: Managing local environment variables for a Go application using a .env file.
Several other libraries offer similar or more sophisticated behavior. The github.com/jpfuentes2/go-env package, for instance, provides an autoload feature that, when imported, will automatically load .env and also attempt to load .env.local for local overrides. It also supports environment‑specific files through the GOENV environment variable. Setting GOENV=test would cause .env.test to be loaded instead of .env .
| Approach | When to use | |----------|--------------| | | Simple projects, single developer | | Multiple .env. files * | Need env‑specific (dev/staging/prod) overrides | | .env.go.local | Team development, persistent local overrides | | Config struct + viper | Production apps needing hot reload, multiple formats |
The developer then runs:
go get github.com/joho/godotenv
"github.com/joho/godotenv"
// 4. Validate critical variables if dbHost == "" log.Fatal("DB_HOST is required but not set.") .env.go.local
"No .env.local file found, using system environment variables" // Access variables using the standard os package port := os.Getenv( ) dbURL := os.Getenv( ) fmt.Printf( "Server starting on port %s...\n" , port) fmt.Printf( "Connecting to database at %s\n" , dbURL)
my-go-app/ ├── .env ├── .env.go.local ├── main.go └── ...
"github.com/joho/godotenv" )
The junior developer had created this file to work on his laptop months ago. He had added it to .gitignore so it wouldn't be committed.
Because .env.go.local is ignored by Git, new developers cloning your repository will not know what variables your application requires. Create a .env.example file that contains the keys but leaves the values blank or filled with safe defaults.
Your codebase should be identical across different environments (local, staging, production). The only thing that changes is the configuration. .env.go.local keeps the local machine's setup separate from the team’s shared settings. 2. Enhanced Security Since is not a standard, default file name
In this article, we'll explore the concept of .env.go.local and how it can simplify your local development workflow in Go applications.
func main() // Load environment variables from .env and .env.go.local files err := godotenv.Load(".env", ".env.go.local") if err != nil log.Fatal("Error loading environment variables:", err)