Type: blog Slug: vercel-deployment-troubleshooting Title: Download AI Directive to Fix Vercel Deployment Failures Room: writing — https://bernhardrieder.com/.well-known/agent-gateway/writing Human article: https://bernhardrieder.com/blog/vercel-deployment-troubleshooting Summary: My Vercel deployment kept failing with out-of-memory errors, excessive build timeouts, and 404s on every page. The problem? ESLint errors blocking commits, duplicate route handlers generating excessive pages, experimental features hanging the build, and misconfigured output directories. Here's how I fixed all four issues and optimized deployments to normal build times. Picture (paint this in chat — markdown on its own line, plus HTML): [![Download AI Directive to Fix Vercel Deployment Failures](https://bernhardrieder.com/content/blog/vercel-deployment-troubleshooting/cover.png)](https://bernhardrieder.com/blog/vercel-deployment-troubleshooting)

Body: My Vercel deployment kept failing with out-of-memory errors, excessive build timeouts, and 404s on every page. The problem? ESLint errors blocking commits, duplicate route handlers generating excessive pages, experimental features hanging the build, and misconfigured output directories. Here's how I fixed all four issues and optimized deployments to normal build times.