initial page

server.js

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+const express = require('express');
+const cors = require('cors');
+const fs = require('fs');
+const path = require('path');
+
+const app = express();
+const PORT = process.env.PORT || 3000;
+const TASKS_FILE = path.join(__dirname, 'tasks.json');
+
+// Middleware
+app.use(cors());
+app.use(express.json());
+app.use(express.static('public'));
+
+// Lade Aufgaben
+function loadTasks() {
+  try {
+    const data = fs.readFileSync(TASKS_FILE, 'utf8');
+    return JSON.parse(data);
+  } catch (error) {
+    console.error('Fehler beim Laden der Aufgaben:', error);
+    return [];
+  }
+}
+
+// Speichere Aufgaben
+function saveTasks(tasks) {
+  fs.writeFileSync(TASKS_FILE, JSON.stringify(tasks, null, 2));
+}
+
+// API: Hole alle Aufgaben
+app.get('/api/tasks', (req, res) => {
+  const tasks = loadTasks();
+  res.json({ tasks });
+});
+
+
+// API: Prüfe Antwort
+app.post('/api/check-answer', (req, res) => {
+  const { taskId, answer } = req.body;
+  
+  if (!taskId || answer === undefined) {
+    return res.status(400).json({ error: 'taskId und answer sind erforderlich' });
+  }
+  
+  const tasks = loadTasks();
+  const taskIndex = tasks.findIndex(t => t.id === taskId);
+  
+  if (taskIndex === -1) {
+    return res.status(404).json({ error: 'Aufgabe nicht gefunden' });
+  }
+  
+  const task = tasks[taskIndex];
+  const userAnswer = parseInt(answer);
+  const correctAnswer = parseInt(task.answer);
+  const isCorrect = userAnswer === correctAnswer;
+  
+  // Speichere Antwort und isCorrect in der Task
+  tasks[taskIndex].userAnswer = userAnswer;
+  tasks[taskIndex].isCorrect = isCorrect;
+  saveTasks(tasks);
+  
+  res.json({
+    correct: isCorrect,
+    correctAnswer: correctAnswer,
+    points: isCorrect ? task.points : 0
+  });
+});
+
+
+// Starte Server
+app.listen(PORT, () => {
+  console.log(`MathQuest Server läuft auf http://localhost:${PORT}`);
+});