retry-later: a tiny TypeScript retry helper

by Tomás Reyes · listed Oct 16, 2026DEMO LISTING

Exponential backoff with full jitter, typed, zero dependencies. The one I keep copy-pasting.

$151 sale

Commercial use

AI involvementHuman-made

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likely 0–12%

052050100%

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Process evidence: 30% strength1 item

Preview

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// retry-later: the retry helper I keep copy-pasting between projects. // No deps. Works in Node 18+ and the browser. export type RetryOpts = { tries?: number; // total attempts, not retries. 4 = 1 + 3 retries base?: number; // ms cap?: number; // ms, so we don't sleep for an hour on attempt 12 retryIf?: (err: unknown) => boolean; }; export async function retry<T>(fn: () => Promise<T>, opts: RetryOpts = {}): Promise<T> { const { tries = 4, base = 200, cap = 5_000, retryIf = () => true } = opts; let last: unknown; for (let i = 0; i < tries; i++) { try { return await fn(); } catch (err) { last = err; if (i === tries - 1 || !retryIf(err)) break; // full jitter. the AWS architecture blog post is still the best explanation of why const wait = Math.random() * Math.min(cap, base * 2 ** i); await new Promise((r) => setTimeout(r, wait)); } } throw last; } // TODO: AbortSignal support. Somebody asked for it in March and I keep forgetting.

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License: Commercial use. Buyer may use it in paid work. You keep ownership.

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Version history (commits, doc history)https://example.com/demo/retry-later-commitsCommit history back to 2022

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