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Retry Operation Wrapper With Error Filters

Wrap flaky operations with the retry package using predicate-based retries, exponential factors, randomization, and per-operation abort signals.

JavascriptResilience

Code

snippet
import retry from 'retry';

async function fetchWithRetry(url, { signal } = {}) {
  const operation = retry.operation({
    retries: 5,
    factor: 2,
    minTimeout: 500,
    maxTimeout: 8000,
    randomize: true,
  });

  return new Promise((resolve, reject) => {
    operation.attempt(async (currentAttempt) => {
      try {
        const res = await fetch(url, { signal });
        if (res.status >= 500) throw new Error('upstream ' + res.status);
        resolve(await res.json());
      } catch (err) {
        if (operation.retry(err)) return;
        reject(operation.mainError());
      }
    });
  });
}

const data = await fetchWithRetry('https://api.example.com/pricing');
console.log('plans:', data.plans.length);

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