Fix build failures when deploying to Vercel

Vercel builds fail for reasons that don't surface locally: missing environment variables, case-sensitive file paths, memory limits, or dependencies that require native compilation. The Vercel build environment is stricter than your local machine.

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Error messages you might see

Error: Build failed with exit code 1
FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory

Why this happens in AI-generated code

1

Environment variables not configured in Vercel

AI-generated code relies on .env.local variables that exist on your machine but aren't configured in Vercel's project settings, causing build-time errors.

2

Case-sensitive file imports

AI tools generate import paths with incorrect casing (e.g., './Components/Header' vs './components/header'). macOS is case-insensitive but Vercel's Linux build environment is not.

3

Build exceeds memory or time limits

AI-generated unoptimized builds with large dependencies or expensive static generation can exceed Vercel's default memory limit (1024 MB) or build timeout.

How to fix it

1

Add all environment variables to Vercel settings

Go to your Vercel project Settings > Environment Variables and add every variable from your .env.local file. Ensure NEXT_PUBLIC_ prefixed vars are set for the correct environments.

2

Fix file path casing to be consistent

Audit your imports to match the exact casing of file and directory names. Use a linter rule like import/no-unresolved to catch these issues before deployment.

3

Get professional help

Still stuck? Our engineers can diagnose and fix your Vercel deployment issues. Visit /products to get started.

Related technologies

Next.jsNode.js

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Frequently asked questions

How do I reproduce the Vercel build locally?

Run `npx vercel build` locally to simulate the Vercel build environment. This catches most environment-specific issues before pushing. You can also use `vercel dev` for a closer simulation.

Can I increase the build memory limit on Vercel?

On the Pro plan, you can set NODE_OPTIONS=--max-old-space-size=4096 in your environment variables. On the Hobby plan, consider optimizing your build to reduce memory usage.

Related resources

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