What is the ( .env ) file

Introduction

The .env file is considered one of the most important files in software development because it contains variables that should not be viewed or known by others.

Importance of This File

The importance of this file lies primarily in security. As a developer, you should not use variables or sensitive data—such as database passwords, API keys, or secret tokens—directly within your source code. Instead, these variables are stored inside the .env file and are written in a KEY=VALUE format.

The file is then added to the .gitignore file. The role of the latter is to ignore any files listed within it, preventing them from being uploaded to platforms like GitHub.

After defining your variables and adding the file to .gitignore, you must manually add these variables to your hosting platform (such as Netlify, Vercel, or GitHub Actions) to ensure the application works in production.

How to Use These Variables

To call these variables when using Vite, they must be prefixed as follows: VITE_API_KEY=#1938348AJDFJBADFJK

You can then access the variable in your code by writing:

Copytypescript
1const API_KEY = import.meta.env.VITE_API_KEY;

If you are using Next then replace "VITE" with "NEXT_PUBLIC"