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JavaScript Academy · Lesson

Retrying & Backoff Patterns

Retry failing async work a few times with delays; add exponential backoff and tiny jitter; stop after a clear max.

Why retry?

Goal: Add small, controlled retries.

  • Simple retry loop
  • Exponential backoff
  • Tiny jitter
  • Clear max attempts
Retrying & Backoff Patterns — illustration 1

Delay helper

You need a tiny delay helper to pause between attempts.

// delay: resolve after ms
function delay(ms) {
  return new Promise(function (resolve) {
    setTimeout(function () { resolve(); }, ms);
  });
}

async function demoDelay() {
  console.log("wait...");
  await delay(5);
  console.log("done");
}

demoDelay();
Retrying & Backoff Patterns — illustration 2

All lessons in this course

  1. Writing async functions; try/catch; parallel vs sequential
  2. Timeouts & Aborting with AbortController
  3. Retrying & Backoff Patterns
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