Vercel Functions using Node.js can now detect when a request is cancelled and stop execution before completion. This is configurable on a per-path basis, and includes actions like navigating away, closing a tab, or hitting stop on an AI chat to terminate compute processing early. This reduces unnecessary compute, token generation, and sending data the user would never see. To enable cancellation, add "supportsCancellation": true to your vercel.json configuration. You can apply it to specific paths or all functions: { "functions" : { "api/*" : { "supportsCancellation" : true } } } Once enabled, you can listen for cancellation using Request.signal.aborted or the abort event: export const GET = async ( req : Request ) => { const abortController = new AbortController ( ) ; req . signal . addEventListener ( "abort" , ( ) => { console . log ( "request aborted" ) ; abortController .…