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server.js

+const express = require('express');
+const http = require('http');
+const socketIo = require('socket.io');
+const axios = require('axios');
+
+const app = express();
+const server = http.createServer(app);
+const io = socketIo(server);
+
+const PORT = process.env.PORT || 3000;
+const rooms = {};
+
+app.use(express.static('public'));
+
+io.on('connection', (socket) => {
+  console.log('A user connected:', socket.id);
+
+  socket.on('createRoom', () => {
+    const roomCode = Math.random().toString(36).substring(2, 7).toUpperCase();
+    rooms[roomCode] = { players: [], questions: [] };
+    socket.join(roomCode);
+    socket.emit('roomCreated', roomCode);
+    console.log(`Room created with code ${roomCode}`);
+  });
+
+  socket.on('joinRoom', (roomCode) => {
+    if (rooms[roomCode]) {
+      socket.join(roomCode);
+      socket.emit('roomJoined');
+      console.log(`User ${socket.id} joined room ${roomCode}`);
+    } else {
+      socket.emit('error', 'Room not found');
+    }
+  });
+
+  socket.on('startGame', ({ roomCode, category, difficulty }) => {
+    fetchQuestions(category, difficulty).then((questions) => {
+      if (!questions || questions.length === 0) {
+        socket.emit('error', 'Failed to load questions');
+        return;
+      }
+
+      rooms[roomCode].questions = questions;
+      io.in(roomCode).emit('newQuestion', questions[0]); 
+    });
+  });
+
+  socket.on('submitAnswer', (data) => {
+    const room = rooms[data.roomCode];
+    
+    if (!room || !room.questions || room.questions.length === 0) {
+      socket.emit('error', 'No questions available');
+      return;
+    }
+    
+    const question = room.questions[0];
+    const correct = question.correctAnswer === data.answer;
+    socket.emit('answerResult', { correct, correctAnswer: question.correctAnswer });
+  });
+
+  socket.on('nextQuestion', (roomCode) => {
+    const room = rooms[roomCode];
+    
+    if (room && room.questions.length > 0) {
+      room.questions.shift();
+      if (room.questions.length > 0) {
+        io.in(roomCode).emit('newQuestion', room.questions[0]);
+      } else {
+        io.in(roomCode).emit('gameOver');
+      }
+    } else {
+      io.in(roomCode).emit('gameOver');
+    }
+  });
+
+  socket.on('disconnect', () => {
+    console.log('User disconnected:', socket.id);
+  });
+});
+
+function fetchQuestions(category, difficulty) {
+  return axios.get(`https://opentdb.com/api.php`, {
+    params: {
+      amount: 5,
+      category,
+      difficulty,
+      type: 'multiple',
+    },
+  })
+  .then((response) => {
+    return response.data.results.map((q) => {
+      let options = [q.correct_answer];
+      for (let incorrect of q.incorrect_answers) {
+        options.push(incorrect); 
+      }
+      options = shuffleArray(options); 
+      return {
+        question: q.question,
+        options: options,
+        correctAnswer: q.correct_answer,
+      };
+    });
+  })
+  .catch((error) => {
+    console.error('Error fetching questions:', error);
+    return [];
+  });
+}
+
+function shuffleArray(array) {
+  for (let i = array.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [array[i], array[j]] = [array[j], array[i]];
+  }
+  return array;
+}
+
+server.listen(PORT, () => console.log(`Server is running on http://localhost:${PORT}`));