errorcore
Middleware

Fastify

Fastify already has a well-defined request lifecycle. Add request context in a hook that runs before handlers, then capture in the shared error handler.

fastify hooks
app.addHook("onRequest", async (request) => {
  errorcore.setRequestContext({
    method: request.method,
    route: request.routerPath ?? request.url,
    requestId: request.id,
  });
});

app.setErrorHandler((error, request, reply) => {
  errorcore.captureError(error, { request: { method: request.method, route: request.url } });
  reply.send(error);
});

Avoid capturing both in a hook and in setErrorHandler, or the same request can produce duplicate incidents.

Express

Mount request context early and let the terminal error middleware report failures once per request.

Koa

Wrap the async middleware chain once so the failing request still carries its request scope.

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Fastify