Debug and fix Next.js build failures
Build failures in Next.js can stem from type errors, missing environment variables, incorrect page exports, or incompatible dependencies. The build process is stricter than development mode, catching issues that dev mode silently ignores.
Error messages you might see
Build error occurred: Error: Failed to compile.next build failed with exit code 1Why this happens in AI-generated code
TypeScript errors ignored in development
AI-generated code often has type mismatches or missing type annotations that dev mode tolerates but the production build catches and rejects.
Missing environment variables at build time
AI tools hardcode or reference environment variables that exist in .env.local but aren't configured in the build environment, causing runtime crashes during static generation.
Incompatible dependency versions
AI assistants may suggest packages pinned to older React or Next.js versions, creating peer dependency conflicts that fail during the build.
How to fix it
Run type checking before building
Run `npx tsc --noEmit` locally to catch all TypeScript errors before attempting a production build. Fix type issues iteratively.
Ensure environment variables are available at build time
For static pages, prefix client-side variables with NEXT_PUBLIC_ and ensure all required variables are set in your CI/CD environment.
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Still stuck? Our engineers specialize in diagnosing complex build failures. Visit /products to get started.
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Frequently asked questions
Why does my app work in dev but fail to build?
Next.js dev mode uses on-demand compilation and skips many optimizations. The build process compiles all pages, runs type checks, and pre-renders static pages - exposing errors that dev mode defers.
How do I debug which page is causing the build failure?
The build output usually shows the file path. You can also run `next build` with the --debug flag or build individual pages by temporarily removing others from the pages/app directory.
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