/BACKEND

A comprehensive backend development journey covering Node.js, Express.js, MongoDB, REST APIs, authentication, and more. This repository showcases hands-on projects aligned with each topic to solidify understanding and practical skills.

Primary LanguageJavaScript

💻 BACKEND

Welcome to the BACKEND repository by ExploitEngineer — a full-stack backend journey built with Node.js, Express.js, MongoDB, JWT, bcrypt, Socket.IO, and more. This repo contains hands-on implementations, real-world projects, and core backend concepts — structured in a professional and developer-friendly way.

🚀 Description

This repository includes all backend code from scratch, covering everything from the Node.js environment setup to advanced backend project architecture. It is designed to build deep backend skills by implementing every concept practically.

🧱 Tech Stack

  • Node.js (Runtime)
  • Express.js (Framework)
  • MongoDB & Mongoose (Database & ODM)
  • EJS (Template Engine)
  • JWT & bcrypt (Authentication & Security)
  • Multer (File Upload)
  • Socket.IO (Real-time Communication)
  • dotenv (Environment Configuration)
  • MVC Architecture (Project Organization)

📁 Repository Structure

BACKEND/
│
├── auth-system/
├── crud-operations/
├── file-upload-multer/
├── mongo-relations/
├── scatch-store/
├── chess-clone-socketio/
│
├── config/
├── utils/
├── middlewares/
└── README.md

📚 Topics Covered

  1. JavaScript Essentials for Backend
  2. Node.js Setup & File System Operations
  3. NPM – Basics & Advanced Usage
  4. Express.js – Routing, Middleware, Config
  5. Form Handling, Sessions, Cookies
  6. EJS Templating, Layouts, Views
  7. CRUD Operations with MongoDB
  8. Mongoose – Schema & Model Design
  9. JWT, bcrypt – Auth & Security
  10. Multer – File Uploads & Folder Structure
  11. Real-Time Chat/App – Using WebSockets
  12. MVC Project Architecture
  13. .env & Deployment Setup

🔨 Major Projects

💼 Scatch: Premium Bag Store

A fully functional eCommerce-like backend project.

  • User Authentication with JWT
  • Add to Cart and Session Handling
  • MVC Folder Structure
  • Clean Separation of Concerns
  • Production vs Development Environment Setup

♟️ Chess.com Clone (Real-time Multiplayer)

Real-time chess app using Socket.IO

  • WebSocket-based communication
  • Multiplayer Rooms & Event Handling
  • Game State Sync
  • Real-time Messaging & Move Broadcasting

📁 File Upload System

Multer-powered file upload API

  • Uploads with multipart/form-data
  • Folder management with custom storage config
  • Secure handling and sanitization

🔐 Auth System (JWT + bcrypt)

Secure login and registration system

  • Password hashing with bcrypt
  • Token generation & verification using JWT
  • Middleware for protected routes

🧪 Setup Instructions

  1. Clone the repository:

    git clone https://github.com/ExploitEngineer/BACKEND.git
cd BACKEND

  2. Navigate to a project folder:

    cd auth-system

  3. Install dependencies:

    npm install

  4. Create a .env file in root of the project and add:

    PORT=4000
MONGO_URI=your_mongodb_connection
JWT_SECRET=your_secret_key

  5. Run the server:

    npm run dev

📦 Environment Variables

Example .env file:

PORT=4000
MONGO_URI=mongodb+srv://your-db-uri
JWT_SECRET=yourSuperSecret

🧠 Learning Goals

  • Build production-ready REST APIs
  • Understand async/await, promises, and middleware flow
  • Work with MongoDB relations and CRUD ops
  • Implement secure authentication with JWT + bcrypt
  • Upload and manage files with Multer
  • Create real-time apps with Socket.IO
  • Use environment configs and structure code properly

🧑‍💻 Author

ExploitEngineer 🌐 github.com/ExploitEngineer

“Backend isn't just about saving data; it's about building logic that powers the world behind the scenes.”