When will you use this?

Use this lesson to build something you can show in interviews and on your resume.

• Portfolio projects prove you can finish — recruiters click your demo link.
• Build one dashboard or shop end-to-end; that beats ten half-finished tutorials.

Real-world: Naukri-like job portal

Real product: Naukri-like job portal (Recruitment). job seekers rely on job search filters and saved jobs every day. On this product, developers use Real-Time Monitoring Project to apply Real-Time Monitoring Project when building interactive screens on Naukri-like job portal. Without it, the team would ship slower, introduce more bugs, or hit performance walls as user count grows. The example below is simplified on purpose — the same pattern appears in production with error handling, loading states, and tests added around it.

Production-style code

connection.on('MetricUpdate', metric => {
  setMetrics(prev => [metric, ...prev].slice(0, 100));
});

{connectionState !== 'Connected' && (
  <Banner>Reconnecting to live feed...</Banner>
)}

What happens in production: In Naukri-like job portal, getting Real-Time Monitoring Project right means job seekers see a fast, correct job search filters and saved jobs. That is the difference between a demo and software people trust with real money, health data, or grades.

Lesson example (start here)

Copy this smaller example first. Once it works, compare it with the real-world code above.

connection.on('MetricUpdate', metric => {
  setMetrics(prev => [metric, ...prev].slice(0, 100));
});

{connectionState !== 'Connected' && (
  <Banner>Reconnecting to live feed...</Banner>
)}

Line-by-line walkthrough

How it works (big picture)

• Keep last 100 points in state for performance.
• Show banner when disconnected.
• Auto-reconnect on backend.

Do this on your computer

1. Mock stream with setInterval first.
2. Replace with WebSocket or SignalR.
3. Add connection status indicator.
4. Read the real-world section and name which part of the app uses this topic.
5. Run the example locally and confirm the same behavior in the browser.
6. Change one value in the example (text, initial state, or URL) and predict what will happen before you save.

Experiments — try changing this

• Change text or labels in the example and save — watch the browser update.
• Break the code on purpose (remove a bracket), read the error message, then fix it.

Remember

Push updates via WebSocket/SSE/SignalR. Cap history length. Show connection health.

Common questions