# 🚀 Simple User CRUD API with Express.js This is a beginner-friendly Node.js project that demonstrates how to perform full CRUD (Create, Read, Update, Delete) operations using **Express.js** and **Postman**. It stores user data in a local mock JSON file (`MOCK_DATA.js`) and dynamically updates it using Node's file system. --- ## 📦 Features - ✅ `GET /api/users` — Fetch all users - ✅ `GET /api/users/:id` — Fetch a specific user by ID - ✅ `POST /api/users` — Create a new user - ✅ `PATCH /api/users/:id` — Update an existing user - ✅ `DELETE /api/users/:id` — Delete a user All API endpoints can be tested using **Postman**. --- ## 🛠 Tech Stack - **Node.js** - **Express.js** - **JavaScript Modules** - **File System (`fs`)** for persistent storage - **Postman** for API testing --- ## 📁 File Structure 

. ├── index.js # Main server file ├── MOCK_DATA.js # Array of user objects (export default [...]) ├── package.json # Dependencies and script info

 --- ## 📦 Installation & Setup 1. **Clone the repo** ```bash git clone https://github.com/your-username/express-crud-api.git cd express-crud-api 

2. Install dependencies

   npm install

3. Start the server

   npm start

4. The server runs at:

   http://localhost:3000 

• Method: GET
• URL: http://localhost:3000/api/users
• Response: JSON array of all users

• Method: GET
• URL: http://localhost:3000/api/users/1
• Response: JSON of that specific user

• Method: POST
• URL: http://localhost:3000/api/users
• Body: (raw JSON)

{ "first_name": "Yasra", "last_name": "Khan", "email": "yasra@example.com" }

• Response: Newly created user with an auto-incremented id

• Method: PATCH
• URL: http://localhost:3000/api/users/1
• Body: (raw JSON)

{ "email": "yasra.updated@example.com" }

• Response: Updated user data

• Method: DELETE
• URL: http://localhost:3000/api/users/1
• Response: Confirmation + deleted user info

• Visit http://localhost:3000/users to see a simple HTML list of users rendered on the browser.

• How to set up and use Express routes
• How to read and write to files using Node’s fs module
• How to test backend APIs using Postman
• How CRUD works at the API level

• Add validation for required fields
• Use UUIDs instead of numeric IDs
• Move to a .json file instead of .js
• Connect to a real database (e.g. MongoDB)

Yasra Kashif

This project is open source and available under the MIT License.

 --- ## 🧩 Add This to Your `package.json` (if not already): ```json "scripts": { "start": "node index.js" }