CLI Weather App – OpenWeather Integration

web/Learning-Season/03-backend/challenges/solution/.gitignore

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+.env
+/node_modules

web/Learning-Season/03-backend/challenges/solution/README.md

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+# 🌦 Weather CLI App
+
+A Node.js command-line application that fetches real-time weather data from the [OpenWeatherMap API](https://openweathermap.org/api) and displays it in the console.
+
+---
+
+## Features
+
+- Interactive city input — no flags or arguments required
+- Also supports CLI argument for scripted/automated use
+- Clean error handling for invalid cities, bad API keys, and network failures
+- Modular architecture: service layer, display layer, and entry point are fully separated
+- Secure API key management via environment variables
+
+---
+
+
+
+## Example Output
+
+```
+Enter city name: Alger
+Fetching weather data for Algiers...
+--------------------
+City: Algiers, DZ
+Temperature: 14°C
+Humidity: 48%
+Wind Speed: 0.51 m/s
+Description: fog
+--------------------
+```
+
+---
+
+## Error Handling
+
+| Scenario | Behavior |
+|---|---|
+| Empty city input | Prints usage message and exits |
+| City not found (404) | Prints `[404] city not found` |
+| Invalid API key (401) | Prints `[401] Invalid API key` |
+| No internet / network failure | Prints fetch error message |
+
+---
+
+## Tech Stack
+
+- **Node.js** (ES Modules)
+- **node-fetch** — HTTP requests
+- **dotenv** — environment variable management
+- **readline** — interactive terminal input
+

web/Learning-Season/03-backend/challenges/solution/index.js

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+//Reads cli args, calls the service, passes the result to display. 
+import dotenv from 'dotenv';
+dotenv.config();
+import readline from 'readline';
+import {fetchWeather} from './services/weatherService.js';
+import {displayWeather} from './utils/display.js';
+
+
+async function askCity(){
+    const rl=readline.createInterface({
+        input: process.stdin,
+        output: process.stdout,
+    });
+    return new Promise((resolve)=>{
+        rl.question('Enter city name: ',(city)=>{
+            rl.close();
+            resolve(city.trim());
+        });
+    })
+}
+async function main() {
+    const city= process.argv[2]|| (await askCity());//argv[0]=node, argv[1]=script, argv[2]=first
+
+    if(!city){
+        console.error('Error: City name cant be empty');
+        process.exit(1);
+    }
+    console.log(`Fetching weather data for ${city}...`);
+    try{
+        const weather= await fetchWeather(city);
+        displayWeather(weather);
+    } catch(err){
+        console.error('Error:',err.message);
+        process.exit(1);
+    }
+}
+
+main();