AbortController in Node (Canceling Work)

Why Cancellation Matters

In production systems, requests may need to be canceled: client disconnects, timeouts, or shutdown events. Without cancellation support, resources remain busy unnecessarily.

AbortController Basics

const controller = new AbortController();
const signal = controller.signal;

setTimeout(() => controller.abort(), 1000);

Using with fetch

await fetch('https://example.com', { signal });

Handling Abort

try {
  await fetch(url, { signal });
} catch (err) {
  if (err.name === 'AbortError') {
    console.log('Request cancelled');
  }
}

Production Insight

• Always cancel long-running external calls.
• Propagate cancellation downstream.
• Combine with graceful shutdown logic.