Vercel errors
Errors that show up in your Vercel build logs or deployment status. Most are configuration problems that resolve themselves once your framework preset, environment variables, and dependencies are aligned.
Vercel build errors look intimidating in the dashboard but they're almost all reproducible locally. The pattern is the same: read the bottom of the build log to find the failing line, run `npm ci && npm run build` locally with the same Node version, and fix what breaks. Common culprits are case-sensitive imports that work on macOS but fail on Linux, env vars set for one environment but not another, and dependencies in the wrong section of `package.json`.
17 errors in this category.
All Vercel errors
- Environment Variable references Secret which does not existFix Vercel 'Environment Variable references Secret which does not exist'. Manage env vars and secrets correctly.
- Next.js hydration mismatchFix Next.js hydration mismatch errors. Move client-only rendering into useEffect or dynamic imports.
- Next.js Module not found: Can't resolveFix Next.js / Vercel 'Module not found: Can't resolve'. Casing, dependencies, and path aliases.
- Next.js: revalidate failed for tagFix Next.js 'revalidate tag failed'. Call revalidateTag from Server Actions and match tag names exactly.
- No Output Directory named "public" found after the Build completedFix Vercel 'No Output Directory named public found after the Build completed'. Framework presets and output directory setup.
- Vercel build exceeded maximum durationFix Vercel 'Build exceeded maximum duration'. Speed up installs, caching, and trim your build step.
- Vercel build failed (generic)Fix 'Vercel build failed' deployments. Reproduce locally, match Node versions, and check env vars.
- Vercel build fails with 'Module not found'Fix Vercel 'Module not found: Can't resolve' build errors. Casing, dependencies, and ignore files.
- Vercel build fails with TypeScript 'Type error'Fix Vercel TypeScript 'Type error' build failures. Reproduce locally, pin versions, and use ignoreBuildErrors as a last resort.
- Vercel deploy hangs at 'Building'Fix Vercel deployment hung on 'Building'. Cancel, reproduce locally, check for blocking build scripts.
- Vercel environment variable not available at build timeFix Next.js env vars showing as undefined on Vercel. NEXT_PUBLIC_ prefix, redeploy after changes, environment scope.
- Vercel: 404 NOT_FOUND / DEPLOYMENT_NOT_FOUND after deployFix Vercel '404: NOT_FOUND / DEPLOYMENT_NOT_FOUND'. Aliases, deleted deployments, and how to recover.
- Vercel: 504 Gateway TimeoutFix Vercel 504 GATEWAY_TIMEOUT. Speed up slow functions, cache results, or raise maxDuration.
- Vercel: ENOENT no such file or directoryFix Vercel 'ENOENT: no such file or directory' build errors. Verify file in Git, check casing, avoid absolute paths.
- Vercel: function exceeded maximum execution timeFix Vercel 'Function exceeded maximum execution time'. Increase maxDuration, cache, or move work to background.
- Vercel: Image Optimization ErrorFix Next.js 'Image Optimization is not allowed'. Add hostname to images.remotePatterns in next.config.
- Vercel: Too Many Redirects (308 loop)Fix Vercel 'ERR_TOO_MANY_REDIRECTS'. Cloudflare SSL mode, www vs apex, and Next.js redirect rules.
Frequently asked questions
Why does it work locally but fail on Vercel?
Almost always: different Node version, missing env var, case-sensitive imports failing on Linux, or `devDependencies` not being installed in production. Match Node versions with `engines` in package.json and reproduce locally with `npm ci && npm run build`.
How do I increase function timeout?
Export `maxDuration` from a route handler. The cap depends on your plan — Hobby is 10s, Pro and Enterprise allow more.
What's the fastest way to debug a stuck build?
Cancel it, then reproduce locally with `VERCEL_DEBUG=1 npm run build`. Hung builds are almost always a script waiting on input or running `next dev` instead of `next build`.
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