🚀 Express.js Learning Repository

This repository is created to learn Express.js step by step in a practical way.

The goal is not just to use Express, but to understand how it works internally, especially how backend APIs handle requests and responses.

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📌 What is Express.js?

Express.js is a minimal and flexible Node.js framework used to build:

• Backend servers
• REST APIs
• Web applications

It simplifies many things that are complex in pure Node.js.

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🧠 What I Learned in This Repo

✅ Core Concepts

• How Express works on top of Node.js
• Difference between Node.js server & Express server
• Request (req) and Response (res) deep understanding

✅ HTTP Methods (CRUD)

• GET – Fetch data
• POST – Create new data
• PUT – Replace existing data
• PATCH – Update specific fields
• DELETE – Remove data

All methods are tested using Thunder Client.

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🧪 Testing Tool

• Thunder Client (VS Code Extension)
• Used to send HTTP requests and test APIs easily.

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📂 Project Structure (Simple)

Express Js/ │ ├── server.js ├── package.json └── README.md │ ├── project-01-crud/ │ ├── server.js │ └── README.md │ ├── project-02-rest-api/ │ ├── server.js │ └── README.md │ └── project-03-advanced/ ├── server.js └── README.md

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⚙️ How to Run the Project

1. Install dependencies:

npm install

2. Start the server:

node server.js

📡 Sample API Endpoints

| Method | Endpoint   | Description           |
| ------ | ---------- | --------------------- |
| GET    | /users     | Get all users         |
| GET    | /users/:id | Get single user       |
| POST   | /users     | Create new user       |
| PATCH  | /users/:id | Update user partially |
| PUT    | /users/:id | Replace user          |
| DELETE | /users/:id | Delete user           |


⚠️ Important Note

Data is stored in memory (RAM) for learning purposes.
When the server restarts, data resets.
In real-world applications, a database is used instead.

🎯 Learning Goal

Build strong backend fundamentals
Understand API flow clearly
Prepare for real-world backend + database integration

👨‍💻 Author

Israr Ahmad
Frontend Web Developer learning Backend with Express.js 🚀


⭐ If you find this helpful, feel free to star the repository!