Using Environment Variables in Next.js

Keeping your keys safe.

Introduction

Environment variables are used everywhere nowadays. Libraries such as dotenv help with achieving the same functionalities while bigger frameworks such as Next.js implement their own versions of dotenv.

A .env file is a file used on your own system which contains keys for making API calls, database connection strings, and so on. But it is important that you would keep these safe for obvious reasons.

Most of the time, frameworks implement environment variables in roughly the same ways. So reading this article will still be useful for understanding the same principles that you could use in other projects.

Installation

Next.js is a simple framework to build web applications using React for templating. It has more features such as routing which I will not get into today.

In your console, run npm initand npm i next react react-dom to install Next.js, React, and ReactDOM via Node Package Manager.

Add the following scripts in your package.json:

"scripts": {  
  "dev": "next dev",
  "build": "next build",
  "start": "next start"
}

Next, we need to add a /pages/ directory with a index.js in it.

function HomePage() {
    return <div>Welcome to Next.js!</div>
  }

  export default HomePage

index.js

Run npm run dev in your terminal, go to localhost:3000 and check if the page is displayed.

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