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Express.js Full Documentation Series

A complete bilingual (Bangla + English) learning resource for Express.js, designed for beginners and intermediate Node.js developers. This repository provides structured, chapter-wise documentation covering everything from basics to advanced topics.

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📘 Project Overview

This repository includes:

• Step-by-step Express.js documentation
• Bangla (Bng) and English (Eng) versions for every topic
• Practical examples and conceptual explanations
• Best practices for building production-ready Express applications

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📂 Documentation Index

01–04: Basics

• 01 Introduction to Express.js (Bng).md

• 01 Introduction to Express.js (Eng).md

• 02 Setting up the Environment (Bng).md

• 02 Setting up the Environment (Eng).md

• 03 Express Routing (Bng).md

• 03 Express Routing (Eng).md

• 04 HTTP methods (Bng).md

• 04 HTTP methods (Eng).md

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05–08: Core Concepts

• 05 Middleware in Express.js (Bng).md

• 05 Middleware in Express.js (Eng).md

• 06 Templating (Bng).md

• 06 Templating (Eng).md

• 07 EJS in Express.js (Bng).md

• 07 EJS in Express.js (Eng).md

• 08 Serving static files in Express.js (Bng).md

• 08 Serving static files in Express.js (Eng).md

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09–12: Working with Data

• 09 Handling form data in Express.js (Bng).md

• 09 Handling form data in Express.js (Eng).md

• 10 Connecting to Database Express (Bng).md

• 10 Connecting to Database Express (Eng).md

• 11 .js vs .mjs (Bng).md

• 11 .js vs .mjs (Eng).md

• 12 Cookies in Express.js (Bng).md

• 12 Cookies in Express.js (Eng).md

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13–15: User & API Management

• 13 Session management in Express (Bng).md

• 13 Session management in Express (Eng).md

• 14 Authentication (Bng).md

• 14 Authentication (Eng).md

• 15 REST full API with Express (Bng).md

• 15 REST full API with Express (Eng).md

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16–17: Project Structure & Error Handling

• 16 Project Scaffolding in Express.js (Bng).md

• 16 Project Scaffolding in Express.js (Eng).md

• 17 Error Handling in Express.js (Bng).md

• 17 Error Handling in Express.js (Eng).md

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📑 How to Use This Repository

This repository is designed as a complete learning path for Express.js. Follow it in sequence or jump to specific topics as needed.

1. Start from the Basics (01–04) to understand core Express foundations.
2. Move into Core Concepts (05–08) to learn middleware, templating, and rendering.
3. Continue with Data Handling (09–12) for forms, cookies, sessions, and databases.
4. Explore User & API Management (13–15) to understand authentication and REST APIs.
5. Finish with Project Structure & Error Handling (16–17) to learn production-ready patterns.
6. Choose Bangla or English documentation based on your preference.
7. Implement the code snippets in actual Express.js apps for hands-on learning.
8. Use this repository as a quick reference while developing Express applications.
9. Treat each .md file as a standalone mini-tutorial with examples.
10. Clone the repository to use the docs offline.

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📂 Recommended Learning Path

If you want structured progress:

Step 1: Basics of Express Introduction → Environment Setup → Routing → HTTP Methods

Step 2: Core Express Features Middleware → Templating → EJS → Static Files

Step 3: Working With Data Forms → Databases → Cookies → Sessions

Step 4: Application Security & API Building Authentication → REST APIs

Step 5: Production Practices Project Scaffolding → Error Handling

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🧰 Requirements

To use the examples and code snippets effectively:

• Node.js (LTS recommended, e.g., 18+ or 20+)
• npm or yarn package manager
• A code editor like VS Code
• Basic JavaScript knowledge (variables, functions, modules)
• Optional: Postman or Thunder Client for API testing
• Optional: MongoDB / MySQL installed (for database topics)

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⚙️ Prerequisites

Before starting:

• You should already know basic terminal commands.
• You should know how to initialize a Node.js project (npm init -y).
• You should be able to install packages using npm (npm install express).
• Understanding of async/await helps but is not mandatory.

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🚀 Running Example Projects

Some topics may include example Express.js code. To run them:

1. Clone the repository

   git clone YOUR_REPO_URL
   

2. Navigate to any example folder (if included)

3. Install dependencies

   npm install
   

4. Start the server

   node app.js
   

5. Open your browser and visit:

   http://localhost:3000
   

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📁 Suggested Folder Structure

If you ever add sample Express projects to this repo:

/docs
   01 Introduction...
   02 Environment...
/examples
   /routing-example
   /middleware-example
   /templating-example
   /auth-example

This helps beginners learn both theory and practice.

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✨ Best Practices for Learning

• Practice each chapter with a real Express app.
• Use Git to save progress.
• Revisit Middleware, Routing, and Async Concepts often.
• Build a small project after finishing each section.
• Try rewriting examples in your own style.

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📬 Contribution

You may contribute by improving documentation, adding examples, fixing mistakes, or adding new chapters.

How to Contribute:

1. Fork the repository
2. Create a feature branch
3. Make changes
4. Add meaningful commit messages
5. Submit a pull request

Contribution Ideas:

• Add sample Express mini-projects
• Add images/diagrams for routing, middleware flow, etc.
• Add explanations of new ES modules (.mjs)
• Add security topics (Helmet, rate limiting)
• Add deployment topics (Vercel, Railway, Render)

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