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.
Error messages you might see
Error: Build failed with exit code 1FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memoryWhy this happens in AI-generated code
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.
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.
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
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.
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.
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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.
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