MCP Weather Server

import { GeocodingResult, WeatherData } from "../types/weather.js"; export class WeatherAPI { private static readonly GEOCODING_BASE_URL = "https://geocoding-api.open-meteo.com/v1"; private static readonly WEATHER_BASE_URL = "https://api.open-meteo.com/v1"; static async getCoordinates( city: string ): Promise<{ latitude: number; longitude: number } | null> { console.error(`[WeatherAPI] Starting geocoding lookup for city: "${city}"`); try { const url = `${this.GEOCODING_BASE_URL}/search?name=${encodeURIComponent( city )}&count=1&language=en&format=json`; console.error(`[WeatherAPI] Geocoding API URL: ${url}`); const response = await fetch(url); console.error( `[WeatherAPI] Geocoding API response status: ${response.status}` ); if (!response.ok) { const errorMsg = `Geocoding API error: ${response.status} ${response.statusText}`; console.error(`[WeatherAPI] ${errorMsg}`); throw new Error(errorMsg); } const data: GeocodingResult = await response.json(); console.error( `[WeatherAPI] Geocoding API response:`, JSON.stringify(data, null, 2) ); if (!data.results || data.results.length === 0) { console.error( `[WeatherAPI] No geocoding results found for city: "${city}"` ); return null; } const { latitude, longitude, name, country } = data.results[0]; console.error( `[WeatherAPI] Found coordinates for "${name}, ${country}": lat=${latitude}, lon=${longitude}` ); return { latitude, longitude }; } catch (error) { console.error( `[WeatherAPI] Error fetching coordinates for "${city}":`, error ); return null; } } static async getCurrentWeather( latitude: number, longitude: number ): Promise<WeatherData | null> { console.error( `[WeatherAPI] Starting weather lookup for coordinates: lat=${latitude}, lon=${longitude}` ); try { const url = `${this.WEATHER_BASE_URL}/forecast?latitude=${latitude}&longitude=${longitude}&current_weather=true`; console.error(`[WeatherAPI] Weather API URL: ${url}`); const response = await fetch(url); console.error( `[WeatherAPI] Weather API response status: ${response.status}` ); if (!response.ok) { const errorMsg = `Weather API error: ${response.status} ${response.statusText}`; console.error(`[WeatherAPI] ${errorMsg}`); throw new Error(errorMsg); } const data: WeatherData = await response.json(); console.error( `[WeatherAPI] Weather API response:`, JSON.stringify(data, null, 2) ); const { temperature, windspeed, weathercode, is_day } = data.current_weather; console.error( `[WeatherAPI] Current weather: ${temperature}°C, wind: ${windspeed} km/h, code: ${weathercode}, day: ${ is_day ? "yes" : "no" }` ); return data; } catch (error) { console.error( `[WeatherAPI] Error fetching weather data for lat=${latitude}, lon=${longitude}:`, error ); return null; } } }