Vercel Functions running on Node.js and Python runtimes now support graceful shutdown, giving you up to 500 milliseconds to run cleanup tasks before termination.

When a function is terminated, such as during scale-down, the runtime receives a SIGTERM signal. You can now use this signal to run cleanup tasks like closing database connections or flushing external logs.

process.on('SIGTERM', () => {
  console.log('Cleanup goes here');
});
export default {
  fetch() {
    return new Response('Hi from a Vercel Function!');
  }
}

Learn more about the SIGTERM signal.