Inngest + Next.js: The Complete Guide (2026)

Serverless functions have a time limit. Vercel gives you 60 seconds on Pro. None of that is enough to send a welcome email sequence, process an uploaded CSV, or run any workflow with multiple external API calls. Inngest solves this by turning your Next.js API routes into reliable, retryable, observable background jobs — without Redis, without a worker process, without any separate queue infrastructure. Read the full guide with all code examples at stacknotice.com How It Works You define functions that run in response to events . When an event fires, Inngest calls your function via HTTP. If the function fails, Inngest retries it. If the function has multiple steps, Inngest checkpoints each step so a failure halfway through doesn't restart from scratch. Setup npm install inngest // lib/inngest/client.ts import { Inngest } from ' inngest ' export const inngest = new Inngest ({ id : ' my-app ' }) // app/api/inngest/route.ts import { serve } from ' inngest/next ' import { inngest } from ' @/lib/inngest/client ' import { welcomeSequence } from ' @/lib/inngest/functions/welcome ' export const { GET , POST , PUT } = serve ({ client : inngest , functions : [ welcomeSequence ], }) Welcome Email Sequence export const welcomeSequence = inngest . createFunction ( { id : ' welcome-email-sequence ' , retries : 3 }, { event : ' user/signed-up ' }, async ({ event , step }) => { const { userId , email , name } = event . data // Each step is independently retried await step . run ( ' send-welcome-email ' , async () => { await resend . emails . send ({ from : ' hello@yourapp.com ' , to : email , subject : `Welcome, ${ name } !` , html : `<p>Thanks for signing up...</p>` , }) }) await step . sleep ( ' wait-2-days ' , ' 2 days ' ) await step . run ( ' send-tips-email ' , async () => { await resend . emails . send ({ from : ' hello@yourapp.com ' , to : email , subject : ' Top 5 tips to get the most out of the app ' , html : `<p>Here are the tips...</p>` , }) }) await step . sleep ( ' wait