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TLS/SSL

Always use encrypted Redis connections in production: 
REDIS_URL=rediss://default:password@host:6379

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Authentication

Implement authentication before socket connection: 
server.on('connection', (socket) => {
  socket.on('authenticate', async ({ token }) => {
    const user = await verifyToken(token);
    if (!user) {
      socket.disconnect();
      return;
    }
    // Store user info
  });
});

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Input Validation

Always validate client input: 
socket.on('message', (data) => {
  if (!data.text || typeof data.text !== 'string') {
    socket.emit('error', { message: 'Invalid input' });
    return;
  }
  // Process valid data
});

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Rate Limiting

Implement rate limiting per session: 
const rateLimits = new Map();

socket.on('message', (data) => {
  const count = rateLimits.get(socket.id) || 0;
  if (count > 100) {
    socket.emit('error', { message: 'Rate limit exceeded' });
    return;
  }
  rateLimits.set(socket.id, count + 1);
});

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Next Steps