Genv: Read Environment Variables Easily with Dotenv Support


Genv is a library for Go (golang) that makes it easy to read and use environment variables in your projects. It also allows environment variables to be loaded from the .env file.


go get


Create a .env file in the root directory of your project and enter the environment variables you want to use:

# .env

In the meantime, it is optional to use the .env file. You can also send environment variables to your project in classic ways:

APP_HOST=localhost ./myproject

Rather than using your environment variables directly in your project, it is better to map and match them with a struct. Below you can see how we get our application parameters from environment variables:

// config/config.go
package config

import ""

type appConfig struct {
    Host string
    Port int
    Debug bool

var  App = &appConfig{
    Host: genv.Key("APP_HOST").String(),
    Port: genv.Key("APP_PORT").Default(8080).Int(),
    Debug: genv.Key("APP_DEBUG").Default(false).Bool(),

In main.go we first include the package that allows you to automatically load the environment variables from the .env file. Then we can include and use the parameters defined in config.go:

// main.go
package main

import (
    _ ""


func  main() {
    fmt.Println(config.App.Host) // localhost
    fmt.Println(config.App.Port) // 1234
    fmt.Println(config.App.Debug) // true

Accessing Environment Variables

Genv provides an easy-to-use API for accessing environment variables.

First we specify the key to the variable want to access

var env = genv.Key("MY_VARIABLE")

Define default value (optional)

env = env.Default("default_value")

Finally, we specify the type of the environment variable and pass its contents to another variable

var myVariable = env.String()

Supported Variable Types

Genv provides support for the following data types:

  • String(): Returns data of String type
  • Int(): Returns data of Int32 type
  • Float(): Returns data of Float64 type
  • Bool(): Returns data of Bool type

For other types, you can use type conversion:

var stringValue = genv.Key("KEY").String()
var byteArrayValue = []byte(stringValue)


Thanks in advance for your contributions :) I would appreciate it if you make sure that the API remains simple when developing.

code changes without tests will not be accepted

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Added some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request

Author: Sakirsensoy
Source Code: 
License: MIT License

#go #golang 

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Genv: Read Environment Variables Easily with Dotenv Support
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Method 1

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Method 2

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Step 1.

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Step 2.

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