Monitoring and Health Checks

Health Check Endpoint

app.get('/health', async (req, res) => {
  const health = {
    uptime: process.uptime(),
    timestamp: Date.now(),
    status: 'ok'
  };
  
  try {
    await mongoose.connection.db.admin().ping();
    health.database = 'connected';
    
    await redisClient.ping();
    health.redis = 'connected';
    
    res.json(health);
  } catch (error) {
    health.status = 'error';
    health.error = error.message;
    res.status(503).json(health);
  }
});

Track Response Time

app.use((req, res, next) => {
  const start = Date.now();
  
  res.on('finish', () => {
    const duration = Date.now() - start;
    console.log(`${req.method} ${req.url} - ${duration}ms`);
    
    if (duration > 1000) {
      console.warn('Slow request detected');
    }
  });
  
  next();
});

Key Takeaway

Implement health checks. Track response times. Alert on anomalies. Use monitoring services.