📒 Note-Taking App

A simple full-stack note-taking application built with Node.js, Express, MongoDB, and a vanilla HTML/CSS/JS frontend. Includes JWT authentication so multiple users can register, log in, and manage their own notes securely.

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🚀 Features

• User registration & authentication (JWT-based)
• Create, read, update, and delete personal notes
• Validation & error handling on server-side
• Clean, minimal front-end interface with HTML, CSS, and JS
• RESTful API endpoints for integration or external use

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🛠️ Setup Instructions

1. Clone the repository

git clone https://github.com/your-username/note-taking-app.git
cd note-taking-app

2. Install dependencies

npm install

3. Set up environment variables

Create a .env file in the root with the following variables:

PORT=3000
MONGO_URI=mongodb://localhost:27017/notetakingapp
JWT_SECRET=your_jwt_secret_here

4. Start the server

npm start

Server will run on http://localhost:3000.

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🖥️ Frontend Usage

Visit http://localhost:3000 to:

• Register/Login as a user
• Add, edit, and delete notes
• View your personal note collection

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📡 API Documentation

Authentication

All protected routes require an Authorization header:

Authorization: Bearer <your_token>

POST /api/auth/register

Register a new user.

// Request
{
  "email": "user@example.com",
  "password": "securepassword"
}

// Response
{
  "token": "<jwt_token>",
  "user": {
    "id": "1234567890",
    "email": "user@example.com"
  }
}

POST /api/auth/login

Log in an existing user.

// Request
{
  "email": "user@example.com",
  "password": "securepassword"
}

// Response
{
  "token": "<jwt_token>",
  "user": {
    "id": "1234567890",
    "email": "user@example.com"
  }
}

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Notes

GET /api/notes

Fetch all notes for the logged-in user.

// Response
{
  "success": true,
  "count": 2,
  "data": [
    {
      "_id": "note123",
      "title": "Shopping List",
      "content": "Milk, Bread, Eggs",
      "user": "1234567890"
    },
    {
      "_id": "note456",
      "title": "Todo",
      "content": "Finish project",
      "user": "1234567890"
    }
  ]
}

POST /api/notes

Create a new note.

// Request
{
  "title": "New Note",
  "content": "This is a test note."
}

// Response
{
  "success": true,
  "data": {
    "_id": "note789",
    "title": "New Note",
    "content": "This is a test note.",
    "user": "1234567890"
  }
}

PUT /api/notes/:id

Update an existing note.

// Request
{
  "title": "Updated Title",
  "content": "Updated content."
}

// Response
{
  "success": true,
  "data": {
    "_id": "note789",
    "title": "Updated Title",
    "content": "Updated content.",
    "user": "1234567890"
  }
}

DELETE /api/notes/:id

Delete a note.

// Response
{
  "success": true,
  "data": {}
}

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⚠️ Error Handling

The API returns structured error responses:

{
  "success": false,
  "error": "Validation error: Title is required"
}

Common error cases:

• Missing fields (e.g., no title or password)
• Invalid credentials on login
• Unauthorized access to another user’s note

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🤝 Contributing

1. Fork the repository
2. Create a new branch (git checkout -b feature/my-feature)
3. Commit your changes (git commit -m 'Add my feature')
4. Push to your branch (git push origin feature/my-feature)
5. Open a Pull Request

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📜 License

This project is licensed under the MIT License.