Environment configuration in Node.js - Mini Project: Build & Apply

Environment Configuration in Node.js

📖 Scenario: You are building a simple Node.js application that needs to connect to a database. To keep your database connection details safe and flexible, you will use environment variables.

🎯 Goal: Create a Node.js script that reads database connection details from environment variables and logs a connection message using those details.

📋 What You'll Learn

Create environment variables for database host, user, and password

Use a configuration object to hold these variables

Write a function that uses the configuration to simulate a database connection message

Log the connection message using the configuration values

💡 Why This Matters

🌍 Real World

Environment variables keep sensitive data like passwords out of your code and allow easy changes without editing code.

💼 Career

Understanding environment configuration is essential for backend developers to build secure and flexible applications.

1

Set up environment variables

Create three environment variables named DB_HOST, DB_USER, and DB_PASS with the exact values localhost, admin, and secret123 respectively. Use process.env to access these variables in your Node.js script.

Node.js

// Access environment variables DB_HOST, DB_USER, and DB_PASS
// Your code here

Need a hint?

Use process.env.VARIABLE_NAME to read environment variables in Node.js.

2

Create a configuration object

Create a constant object named dbConfig that holds the properties host, user, and password using the variables DB_HOST, DB_USER, and DB_PASS.

Node.js

const DB_HOST = process.env.DB_HOST;
const DB_USER = process.env.DB_USER;
const DB_PASS = process.env.DB_PASS;

// Create dbConfig object here
// Your code here

Need a hint?

Create an object with keys host, user, and password assigned to the environment variables.

3

Write a function to simulate connection

Write a function named connectToDatabase that takes the dbConfig object as a parameter and returns a string: Connected to database at HOST with user USER, replacing HOST and USER with the corresponding values from dbConfig.

Node.js

const DB_HOST = process.env.DB_HOST;
const DB_USER = process.env.DB_USER;
const DB_PASS = process.env.DB_PASS;

const dbConfig = {
  host: DB_HOST,
  user: DB_USER,
  password: DB_PASS
};

// Write connectToDatabase function here
// Your code here

Need a hint?

Use a template string to include config.host and config.user in the returned message.

4

Log the connection message

Call the connectToDatabase function with dbConfig and assign the result to a constant named connectionMessage. Then, log connectionMessage to the console.

Node.js

const DB_HOST = process.env.DB_HOST;
const DB_USER = process.env.DB_USER;
const DB_PASS = process.env.DB_PASS;

const dbConfig = {
  host: DB_HOST,
  user: DB_USER,
  password: DB_PASS
};

function connectToDatabase(config) {
  return `Connected to database at ${config.host} with user ${config.user}`;
}

// Call function and log the message
// Your code here

Need a hint?

Assign the function call result to connectionMessage and use console.log to display it.