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What is Node.js?
Definition: Node.js is an open-source, cross-platform JavaScript runtime built on Chrome’s V8 engine.

Purpose: Allows you to run JavaScript outside the browser — mainly for building servers, APIs, CLI tools, and real-time apps.

Key Feature: Event-driven, non-blocking I/O → handles many connections efficiently.

2009 – The Birth
Creator: Ryan Dahl

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console.log("Hi")

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export PS1='%{%F{green}%}%n@%m%{%f%}:%{%F{yellow}%}%~%{%f%}$ '

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ls
ls -a
these are the commands

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Part - C: Backend Assignment

Title: Full Stack Backend System for Hotel Management with Advanced Security & Verification

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Question 1: [50 Marks]

Design and implement a complete backend for a Hotel Management System using Node.js, Express, and MongoDB. The system should support User, Admin, and Staff roles and include authentication, logging, rate-limiting, and user verification.

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Git and GitHub Setup 

To Install Git In Ubuntu 
1. sudo apt update && sudo apt install git -y
2. git --version 


To Install Git In MacOS

1.brew install git

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sudo chown -R $USER:$USER ~/.npm
sudo chown -R $USER:$USER node_modules package-lock.json
export NVM_DIR="$HOME/.nvm"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh"
[ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"
npm config delete proxy
npm config delete https-proxy
export PATH=$PATH:$(npm bin -g)

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Steps for Deployment WebApp / Websites 

1.Make sure you have webapp or website is working good at local
2.make a GitHub repo and push the code to GitHub without node_modules
3.Changes in GitHub Repo
- Add Description 
- Add URL
- Add Keywords
- Add README.md 

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sudo apt install -y git
sudo apt install -y net-tools
sudo timedatectl set-timezone Asia/Kolkata
sudo apt-get install -y nginx
sudo apt install -y snapd
sudo snap install core
sudo apt-get install -y python3-certbot-nginx
sudo snap install --classic certbot
sudo ln -s /snap/bin/certbot /usr/bin/
sudo apt install -y python3-pip

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import express from "express";
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";
import config from "config";
import cors from "cors";

// Database connection
import "./utils/dbConnect.js";