How We Monitor APIs: A Real-World Example Using Node.js

APIs are the backbone of modern applications. But just because your API returns a 200 OK doesn't mean everything's working fine.

Slow responses, partial timeouts, or degraded performance can silently break your user experience. In this post, we'll show you:

• How to monitor an API using a simple Node.js example
• Which metrics matter most
• How Watchman Tower handles API monitoring effortlessly

A Basic Health Check in Node.js

const fetch = require('node-fetch');
async function checkAPI() {  
const start = Date.now(); 
try {   
	const res = await fetch('https://api.myapp.com/health');
    const duration = Date.now() - start;
    if (!res.ok) {    
        console.error(`API returned error: ${res.status}`);    
    } else {
        console.log(`API healthy. Response time: ${duration}ms`);   
     }  
} catch (err) {
     console.error('API is down or unreachable.', err);
}
                   
checkAPI();

✅ Checks uptime
✅ Measures response time
❌ But only works manually — and locally

Why Manual Monitoring Falls Short

Manual checks are unreliable. You need real-time monitoring, historical data, and alerts when things go wrong. That’s where Watchman Tower helps.

How Watchman Tower Handles API Monitoring

• Setup takes less than 5 minutes
• Endpoints are checked from multiple regions
• Slack, Email, and SMS alerts in real-time
• All response times are logged and visualized

Example:
🔔 GET https://api.myapp.com/health responded in 850ms → Slack alert sent

Custom Intervals & Timeouts

You can define how often to run checks and set custom timeout durations. Whether you want to ping your API every 1 minute or every 5 — it’s your choice.

Timeout settings are fully customizable, allowing you to decide when an API should be marked as “down.”

Threshold-Based Alerts? Coming Soon.

We’re working on smart alerting features like:

• “Notify me if latency > 500ms for 2+ minutes”
• “Only alert if consecutive checks fail”

If you'd like early access, let us know. We're building it with developer feedback.

Try It Yourself

No bloated configs. No YAML. Just fast, developer-friendly monitoring.

Start Monitoring Your APIs Now
🚀 14-day free trial – no credit card required