Next.js Build Failing on Vercel: How to Find the First Real Failure
A practical way to debug failing Next.js builds on Vercel, from first useful error lines and environment drift to route generation and memory pressure.
Articles
Vercel
Vercel is the company behind Next.js and provides a cloud platform for hosting and deploying modern web applications, particularly those built with React, Next.js, and other JavaScript frameworks. It includes Git integration, serverless functions, automatic scaling, and global edge deployment. It also provides first‑class support for Next.js rendering and routing features, including SSR, ISR, and API routes, helping teams ship high‑performance applications with less infrastructure configuration.
Below you will find a subset of articles from my blog specifically about Vercel and related Vercel deployment debugging. This is a topic I have worked with for many years, although it has not been one I have written about often. There are seven articles collected below.
Next.js Build Failing on Vercel: How to Find the First Real Failure. 
NextAuth Works Locally but Fails in Production. NextAuth Works Locally but Fails in Production
How to debug NextAuth when it works locally but fails in production, covering callback URLs, cookies, secrets, middleware, providers, and Vercel.
Why Next.js Builds Time Out on Vercel. Why Next.js Builds Time Out on Vercel
Debug Next.js build timeouts on Vercel by checking route generation, CMS data fan‑out, memory pressure, image work, caching, logs, and platform limits.
Next.js Site Broke After Deploy: A Production Triage Checklist. Next.js Site Broke After Deploy: A Production Triage Checklist
A Next.js production triage checklist for broken deploys, covering rollback decisions, logs, environment drift, routes, auth, CMS data, and cache.
CMS Content Not Updating in Next.js. CMS Content Not Updating in Next.js
A production runbook for stale CMS content in Next.js, covering webhooks, route dependencies, ISR, cache boundaries, preview and editor trust.
From Netlify Deploys to Vercel Pipelines. From Netlify Deploys to Vercel Pipelines
How deployment expectations moved from simple Netlify static deploys toward Vercel pipelines, previews, framework builds, observability, and rollback.
Redirect a Default Vercel Subdomain to Your Custom Domain. Redirect a Default Vercel Subdomain to Your Custom Domain
When you set up a custom domain in Vercel, the default `vercel.app` subdomain still serves your site, which can lead to duplicate content. Here's how to fix it.