Lab Exercise: Working with ENV Variables

🎯 Objectives

This lab exercise focuses on:

• Understanding the importance of Environment (ENV) variables.
• Learning to use the dotenv package for managing these variables.
• Implementing a script that securely retrieves and utilizes ENV variables.

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📚 Prerequisites

Before starting, ensure you have:

• Basic knowledge of JavaScript.
• Familiarity with terminal/command line operations.

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🚀 Steps

1. Install the dotenv Package

Install the dotenv package using npm to help load ENV variables from a .env file into your application.

Run the following command:

npm install dotenv

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2. Create an .env File

Create a file named .env in your project directory and add the following variables:

API_KEY=
SERVER_SECRET=
IS_KALVIAN=true

Fill in the values for API_KEY and SERVER_SECRET as needed.

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3. Read the ENV Variables

Write a JavaScript script to retrieve and use these variables with the dotenv package.

Here’s an example:

// Load the dotenv package
require('dotenv').config();

// Access environment variables
const config = {
  apiKey: process.env.API_KEY,
  serverSecret: process.env.SERVER_SECRET,
  isKalvian: process.env.IS_KALVIAN === 'true',
};

// Export the config object
module.exports = config;

// Log the variables (Optional for testing)
console.log(config);

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4. Run the Script

Execute the script to verify that the environment variables are loaded and accessible.

node <your_script_name>.js

You should see the environment variables printed in the console if everything is set up correctly.

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🏁 Outcome

By completing this exercise, you will have:

• Created a script that securely retrieves and uses ENV variables.
• Learned the importance of dotenv in managing environment configurations.
• Enhanced the security and flexibility of your code by separating sensitive data from your source files.

🎉 Congratulations! You've successfully implemented a secure environment variable management system using the dotenv package.