config

Config

This package provides environment-based configuration with automatic struct field mapping.

Usage

The GetConfig function takes 2 arguments:

• filename - path to the .env file (optional, can be empty)
• config - pointer to a struct that will be populated

type Config struct {
    Port string                    // Required by default
    DatabaseHost string            // Maps to DATABASE_HOST
    OptionalSetting string `required:"false"` // Optional field
}

var config Config
err := GetConfig(".env", &config)
if err != nil {
    log.Fatal(err)
}

Field Mapping

Struct field names are automatically converted to SNAKE_CASE environment variables:

• ServerPort → SERVER_PORT
• DatabaseHost → DATABASE_HOST

Configuration

• All fields must be strings
• Fields are required by default
• Use required:"false" tag for optional fields
• Missing required environment variables return an error

Environment File

Example .env file:

PORT=8080
DATABASE_HOST=localhost