🖥️ Backend Mastery: From Zero to Backend Hero 🔥

NOTE:- The "must_change.env" must require some changes;
     > remove the word "must_change.env" and change it into ".env" only
     > replace values with your own credentials inside .env file

📅 Day 01

"The journey of a thousand miles begins with one step."

1. Project Initialization

   • package.json setup
   • Install Express & dotenv
     

2. Configuration

   • Create .env file (PORT)
   • Build server (index.js)
     

3. Routing & Server

   • Define GET routes (/, /login, /signup)
   • Start server

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📅 Day 02

"Code is like humor. When you have to explain it, it’s bad."

1. API Fundamentals

   • What is an API
   • Role in frontend-backend communication
     

2. Working with APIs in React

   • Fetch vs Axios comparison
   • Axios GET request with then() & catch()
   • Best practices (useEffect, useState, error handling)
     

3. Handling CORS Issues

   • What is CORS
   • Proxy setup in Vite
   • Backend solutions (cors package, headers)

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📅 Day 03

"Structure your data before you build — clean models lead to clean code."

1. Data Modeling Basics

   • Object modeling purpose
   • Benefits of early planning
     

2. Introduction to Mongoose

   • What is Mongoose
   • Schemas and models
     

3. Project Structure & Naming Conventions

   • models/ folder setup
   • File naming patterns
     

4. Schema Definition Essentials

   • Field types and rules
   • Common validations (required, unique, min, etc.)
   • Timestamps for created/updated tracking
   • Model Relationships: Using ref for associations

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📅 Day 04

"Learning to write programs stretches your mind, and helps you think better."

1. Data Modeling Practice

   • E-Commerce Store Schema Design
   • Hospital Management System Schema Design
     

2. Exploring Mongoose Concepts

   • Review: models/ecommerce/
   • Review: models/hospital_management/

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📅 Day 05

"A well-structured project is the foundation of professional software development."

1. UI/UX Design & DB Planning Phase

   • Design all screens using tools like Figma
   • Collect data points for DB
   • Create data modeling diagram (with tools like Eraser.io)
     

2. Project Initialization & Structuring

   • Initialize package.json with npm init
   • Setup common folders: src, public, controllers, routes, etc.
   • Create essential files: .env, .gitignore, README.md, etc.
     

3. Development Tools Setup

   • Install nodemon for auto-restart
   • Install prettier for consistent formatting
     

4. Files Configuration

   • Use online generator to create .gitignore for Node.js
   • Add .prettierrc and .prettierignore files
   • Update package.json for modules and scripts

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📅 Day 06

"Build software the way real teams do – step by step, piece by piece."

1. MongoDB Atlas

   • Create account, project, cluster
   • Save URI in .env
     

2. DB Connection

   • Two connection approaches: Direct connect in index.js (less modular) Use src/db/connection.js
   • Best Practices: Use async/await + try/catch
     

3. Import Rules

   • Load dotenv at top of entry file
   • Add .js extension to imports
   • Keep secrets in .env
   • Keep index.js clean

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📅 Day 07

"Building real-world back-end architecture step by step."

1. Express App Setup (app.js)

   • Middlewares: cors, cookieParser, express.json, etc.
     

2. Server Initialization (index.js)

   • DB connection, server start, and error handling
     

3. Utility Modules (utils/)

   • asyncHandler.js – async error wrapper
   • ApiError.js – custom error class
   • ApiResponse.js – consistent success responses