Pagerless for Fastify

Set up

npm i pagerless

import { pagerlessFastify } from "pagerless/fastify";

pagerlessFastify(app);

What it catches

• 5xx and unknown errors through Fastify's onError hook.
• Reports 5xx and crashes only, never 4xx, and leaves the response, logs and error exactly as they were.
• On Node it also starts the SDK: uncaught errors and unhandled rejections, status and latency per route, failing outbound calls (Stripe, OpenAI, Supabase and others named), a heartbeat every 60 seconds and a deploy marker.

Updated October 22, 2026.