| Feature | .env file + godotenv | OS env vars | .env.go.local | | :--- | :--- | :--- | :--- | | | ❌ String only | ❌ String only | ✅ Full Go types | | Compile-time validation | ❌ Runtime error | ❌ Runtime error | ✅ Compiler catches errors | | Production isolation | ⚠️ Must not commit file | ✅ Secure | ✅ Build tags prevent leaks | | Developer experience | Okay | Tedious | Excellent (IDE autocomplete) | | Overhead | Runtime parsing | Zero | Zero (compile-time) |
Contains default, non-sensitive variables shared among the team (e.g., DB_PORT=5432 ). It is often committed to version control. .env.go.local
package main import ( "fmt" "log" "os" "://github.com" ) func init() // Cascade loading: Load the specific local file first. // If it doesn't exist, godotenv will throw an error, so we log it gently or ignore it. err := godotenv.Load(".env.go.local") if err != nil // Log informational message; falling back to standard .env log.Println("No .env.go.local found, falling back to base .env") if err := godotenv.Load(".env"); err != nil log.Println("Warning: No base .env file detected") func main() // Fetching values loaded from your environment files dbUser := os.Getenv("DB_USER") dbPass := os.Getenv("DB_PASSWORD") dbHost := os.Getenv("DB_HOST") fmt.Printf("Connecting to database at %s as user: %s\n", dbHost, dbUser) // Securely use the credentials... Use code with caution. Advanced Production Architecture | Feature |