EnvLoader

EnvLoader is a Go package that loads environment variables from a .env file and optionally binds them to a struct.

Installation

go get gopkg.eu.org/envloader

Usage

Loading Environment Variables

package main

import (
    "fmt"

    "gopkg.eu.org/envloader"
)

func main() {
    // Load environment variables from a file.
    err := envloader.LoadEnvFile(".env")
    if err != nil {
        panic(err)
    }

    // Access the environment variables.
    fmt.Println(os.Getenv("API_KEY"))
    fmt.Println(os.Getenv("DATABASE_URL"))
}

Binding Environment Variables to a Struct

package main

import (
    "fmt"

    "gopkg.eu.org/envloader"
)

type Config struct {
    APIKey     string `env:"API_KEY"`
    DatabaseURL string `env:"DATABASE_URL"`
}

func main() {
    // Create a config struct.
    var config Config

    // Load and bind environment variables from a file.
    err := envloader.LoadAndBindEnvFile(".env", &config)
    if err != nil {
        panic(err)
    }

    // Access the config values.
    fmt.Println(config.APIKey)
    fmt.Println(config.DatabaseURL)
}

Struct Tag Options

You can use the env struct tag to specify the environment variable name to bind to a struct field:

type Config struct {
    APIKey     string `env:"API_KEY"`
    DatabaseURL string `env:"DATABASE_URL"`
}

Additionally, you can mark a field as required by adding the required option to the env tag. This will raise an error if the environment variable is not set:

type Config struct {
    APIKey     string `env:"API_KEY,required"`
    DatabaseURL string `env:"DATABASE_URL,required"`
}

Contributing

Contributions are welcome! Please open an issue or pull request if you have any suggestions or bug reports.

License

This package is licensed under the Unlicense.