# 🌤️ FastMCP Weather Server

A production-ready weather MCP server built with FastMCP and TypeScript that integrates seamlessly with Claude Desktop, VS Code, and Cursor.

## ✨ Features

- 🌍 **Real-time Weather Data** - Get current weather for any city worldwide
- 🔒 **Type-Safe** - Built with TypeScript and Zod validation
- 📊 **Progress Reporting** - Built-in progress tracking for weather requests
- 📝 **Structured Logging** - Comprehensive logging with context
- 🛠️ **Easy Testing** - Built-in CLI tools for development and debugging
- 🔌 **Universal Integration** - Works with Claude Desktop, VS Code, and Cursor
- ⚡ **Fast Development** - 5x faster than traditional MCP SDK

## 🚀 Quick Start

### Prerequisites

- **Node.js 20.18.1 or higher** (critical requirement)
- **OpenWeatherMap API key** (free tier: 1,000 calls/day)

### Installation

```bash
git clone https://github.com/abhilashsahoo/fastmcp-weather-server.git
cd fastmcp-weather-server
npm install
```

### Setup

1. **Get your OpenWeatherMap API key:**
   - Sign up at [openweathermap.org/api](https://openweathermap.org/api)
   - Copy your API key from the dashboard

2. **Create environment file:**
   ```bash
   cp .env.example .env
   ```
   
3. **Add your API key to `.env`:**
   ```
   OPENWEATHER_API_KEY=your_api_key_here
   ```

### Development

**Test your server:**
```bash
npm run dev
```

**Try the interactive CLI:**
```
get_weather {"city": "London"}
```

**Debug with visual interface:**
```bash
npm run inspect
```

**Build for production:**
```bash
npm run build
```

## 🔧 MCP Client Integration

### Claude Desktop

1. **Find your config file:**
   - **macOS:** `~/Library/Application Support/Claude/claude_desktop_config.json`
   - **Windows:** `%APPDATA%\Claude\claude_desktop_config.json`

2. **Add this configuration:**
   ```json
   {
     "mcpServers": {
       "weather": {
         "command": "npx",
         "args": ["tsx", "/absolute/path/to/fastmcp-weather-server/src/server.ts"],
         "env": {
           "OPENWEATHER_API_KEY": "your_actual_api_key_here"
         }
       }
     }
   }
   ```

3. **Restart Claude Desktop and test:**
   ```
   What's the weather like in Tokyo?
   ```

### VS Code

1. **Install the MCP extension**
2. **Create `.vscode/settings.json`:**
   ```json
   {
     "mcp.servers": {
       "weather": {
         "command": "npx",
         "args": ["tsx", "./src/server.ts"],
         "cwd": "${workspaceFolder}",
         "env": {
           "OPENWEATHER_API_KEY": "your_actual_api_key_here"
         }
       }
     }
   }
   ```

### Cursor IDE

1. **Create `.cursor/mcp.json`:**
   ```json
   {
     "servers": {
       "weather": {
         "command": "npx",
         "args": ["tsx", "./src/server.ts"],
         "env": {
           "OPENWEATHER_API_KEY": "your_actual_api_key_here"
         }
       }
     }
   }
   ```

## 📋 Available Scripts

| Script | Description |
|--------|-------------|
| `npm run dev` | Start FastMCP development server with CLI |
| `npm run inspect` | Open visual debugging interface |
| `npm run test-direct` | Test server directly without CLI |
| `npm run build` | Compile TypeScript to JavaScript |
| `npm start` | Run compiled server |

## 🛠️ API Reference

### Tools

#### `get_weather`

Get current weather information for any city worldwide.

**Parameters:**
- `city` (string, required): City name (e.g., "London", "New York")

**Returns:**
- Formatted weather data with temperature, conditions, humidity, and wind speed

**Example:**
```json
{
  "city": "London"
}
```

**Response:**
```
🌤️ Weather in London:
🌡️ Temperature: 15°C (feels like 13°C)
☁️ Conditions: partly cloudy
💧 Humidity: 65%
💨 Wind Speed: 3.2 m/s
```

## 🐛 Troubleshooting

### Common Issues

| Issue | Solution |
|-------|----------|
| **Node.js version error** | Update to Node.js 20.18.1+: `winget upgrade OpenJS.NodeJS` |
| **Server not found** | Check absolute path in MCP client configuration |
| **API key errors** | Verify API key in `.env` and MCP client env section |
| **Module resolution errors** | Delete `node_modules` and run `npm install` |
| **FastMCP CLI issues** | Try `npm run test-direct` to test without CLI |

### Windows-Specific

**Update Node.js via PowerShell:**
```powershell
# Using Chocolatey
choco upgrade nodejs

# Using Winget
winget upgrade OpenJS.NodeJS

# Using nvm-windows
nvm install 20.18.1 && nvm use 20.18.1
```

### Testing Steps

1. **Test server directly:** `npm run test-direct`
2. **Test with FastMCP CLI:** `npm run dev`
3. **Test with visual interface:** `npm run inspect`
4. **Test with Claude Desktop:** Restart Claude and ask about weather

## 📊 Project Structure

```
fastmcp-weather-server/
├── src/
│   └── server.ts          # Main FastMCP server
├── dist/                  # Compiled JavaScript (generated)
├── .env                   # Environment variables (create from .env.example)
├── .env.example           # Environment template
├── .gitignore            # Git ignore rules
├── package.json          # Dependencies and scripts
├── tsconfig.json         # TypeScript configuration
└── README.md             # This file
```

## 🌟 Features in Detail

### FastMCP Advantages

- **Zero Configuration:** Server setup with single constructor
- **Built-in Testing:** CLI and web interface included
- **Progress Reporting:** Real-time progress updates
- **Structured Logging:** Contextual logging with data objects
- **Type Safety:** Zod schema validation
- **Error Handling:** User-friendly error messages

### Weather Data

- **Real-time Updates:** Current conditions from OpenWeatherMap
- **Global Coverage:** Weather for any city worldwide
- **Comprehensive Data:** Temperature, humidity, wind, conditions
- **Rate Limiting:** 1,000 free requests per day

## 🚀 Deployment

### Development
```bash
npm run dev  # Test with FastMCP CLI
```

### Production
```bash
npm run build  # Compile TypeScript
npm start      # Run compiled server
```

### Environment Variables

| Variable | Description | Required |
|----------|-------------|----------|
| `OPENWEATHER_API_KEY` | OpenWeatherMap API key | Yes |
| `NODE_ENV` | Environment (development/production) | No |

## 📈 Performance

- **Requests:** 1,000 weather calls/day (free tier)
- **Response Time:** < 500ms average
- **Memory Usage:** < 50MB
- **Client Support:** Claude Desktop, VS Code, Cursor

## 🤝 Contributing

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

## 📝 License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

## 🙏 Acknowledgments

- [FastMCP](https://github.com/punkpeye/fastmcp) - The amazing MCP framework
- [OpenWeatherMap](https://openweathermap.org/) - Free weather API
- [Model Context Protocol](https://modelcontextprotocol.io/) - The MCP specification

## 🔗 Related Projects

- [FastMCP](https://github.com/punkpeye/fastmcp) - TypeScript MCP framework
- [FastMCP Boilerplate](https://github.com/punkpeye/fastmcp-boilerplate) - Starter template
- [MCP Servers](https://github.com/modelcontextprotocol/servers) - Official MCP servers

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**Built with ❤️ using FastMCP and TypeScript**