Karim w2 node js

assignments/hackyourtemperature/.gitignore

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+node_modules

assignments/hackyourtemperature/__tests__/app.test.js

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+import app from '../app.js';
+import supertest from 'supertest';
+
+const request = supertest(app);
+
+describe('POST /weather', () => {
+    test('400 when cityName missing', async () => {
+        const res = await request.post('/weather').send({});
+        expect(res.status).toBe(400);
+        expect(typeof res.body.error).toBe('string');
+        expect(res.body.error.toLowerCase()).toContain('cityname');
+    });
+
+    test('404 when city not found', async () => {
+        const res = await request
+            .post('/weather')
+            .send({ cityName: '___nope___' });
+        expect(res.status).toBe(404);
+        expect(typeof res.body.weatherText).toBe('string');
+        expect(res.body.weatherText.toLowerCase()).toContain('not found');
+    });
+
+    test('200 for a valid city returns fields', async () => {
+        const res = await request
+            .post('/weather')
+            .send({ cityName: 'Amsterdam' });
+        expect(res.status).toBe(200);
+        expect(res.body.cityName.toLowerCase()).toContain('amsterdam');
+        expect(typeof res.body.weatherText).toBe('string');
+        expect(
+            typeof res.body.temperature === 'number' || res.body.temperature === null
+        ).toBe(true);
+    });
+});

assignments/hackyourtemperature/app.js

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+import express from 'express';
+import fetch from 'node-fetch';
+import keys from './sources/keys.js';
+
+const app = express();
+app.use(express.json());
+
+app.get('/', (_req, res) => {
+    res.type('text/plain').send('hello from backend to frontend');
+});
+
+app.post('/weather', async (req, res) => {
+    const { cityName } = req.body ?? {};
+    if (!cityName || typeof cityName !== 'string' || !cityName.trim()) {
+        return res.status(400).json({
+            error: 'Send JSON like { "cityName": "Amsterdam" }',
+        });
+    }
+
+    try {
+        const url =
+            `https://api.openweathermap.org/data/2.5/weather` +
+            `?q=${encodeURIComponent(cityName.trim())}` +
+            `&appid=${keys.API_KEY}&units=metric`;
+
+        const r = await fetch(url);
+        const data = await r.json();
+
+        if (r.status === 404 || data?.cod === '404') {
+            return res.status(404).json({ weatherText: 'City is not found!' });
+        }
+
+        const name = data?.name ?? cityName.trim();
+        const temp = typeof data?.main?.temp === 'number' ? data.main.temp : null;
+
+        return res.json({
+            cityName: name,
+            temperature: temp,
+            weatherText: `${name}: ${temp}°C`,
+        });
+    } catch (err) {
+        console.error(err);
+        return res.status(500).json({ error: 'Server error contacting API' });
+    }
+});
+
+export default app;

assignments/hackyourtemperature/babel.config.cjs

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+module.exports = {
+    presets: [
+        [
+            '@babel/preset-env',
+            {
+                targets: {
+                    node: 'current'
+                },
+            },
+        ],
+    ],
+};

assignments/hackyourtemperature/jest.config.js

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+export default {
+    transform: {
+        '^.+\\.jsx?$': 'babel-jest'
+    },
+
+    testEnvironment: 'node',
+    transformIgnorePatterns: [],
+};

assignments/hackyourtemperature/package.json

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+{
+  "name": "hackyourtemperature",
+  "version": "1.0.0",
+  "type": "module",
+  "main": "server.js",
+  "description": "",
+  "scripts": {
+    "test": "jest",
+    "start": "node server.js",
+    "dev": "nodemon --ext js,json --watch . server.js"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "express": "^5.1.0",
+    "express-handlebars": "^8.0.3",
+    "node-fetch": "^3.3.2"
+  },
+  "devDependencies": {
+    "@babel/preset-env": "^7.28.5",
+    "babel-jest": "^30.2.0",
+    "jest": "^30.2.0",
+    "nodemon": "^3.1.10",
+    "supertest": "^7.1.4"
+  }
+}

assignments/hackyourtemperature/server.js

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+import app from './app.js';
+
+const PORT = process.env.PORT || 3000;
+app.listen(PORT, () => {
+    console.log(`Server listening on http://localhost:${PORT}`);
+});

assignments/hackyourtemperature/sources/keys.js

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+export default {
+    API_KEY: 'f6f12ccf08763d2f26c3ea0142cc94ee',
+};