Next.js Build Error After Changes
After Cursor refactored your Next.js application, the build command fails. The application won't build for production.
The refactored code violates Next.js requirements or broke the build configuration.
Error Messages You Might See
Common Causes
- Server component using client-only code (window, hooks in server)
- API route using wrong export (named instead of default)
- Image dimensions not specified (if using Image component)
- Dynamic import syntax incorrect for Next.js
- Environment variables not exposed to client
How to Fix It
Add 'use client' directive for client components. API routes: export default function handler(req, res) {}. Images: use next/image with width/height. Dynamic imports: dynamic(() => import('component'), {ssr: false}). Env: prefix with NEXT_PUBLIC_ for client access.
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Victor Denisov
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Basel Issmail
’m a Senior Full-Stack Developer and Tech Lead with experience designing and building scalable web platforms. I work across the full development lifecycle, from translating business requirements into technical architecture to delivering reliable production systems.
My work focuses on modern web technologies, including TypeScript, Angular, Node.js, and cloud-based architectures. I enjoy solving complex technical problems and helping teams turn product ideas and prototypes into working platforms that can grow and scale.
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Been around fixing other peoples code for 20 years.
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Stanislav Prigodich
15+ years building iOS and web apps at startups and enterprise companies. I want to use that experience to help builders ship real products - when something breaks, I'm here to fix it.
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I’m a product-focused engineer and tech leader who builds scalable systems and turns ideas into production-ready platforms.
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Full-stack professional senior engineer (15+years). Extensive experience in software development, qa, and IP networking.
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Get HelpFrequently Asked Questions
What's the difference between server and client components?
Server components (default) run on server, no bundle size cost. Client need 'use client' directive, bundle included. Use server when possible.
How do I use environment variables in Next.js?
Prefix with NEXT_PUBLIC_ to expose to client. Access with process.env.NEXT_PUBLIC_VAR in browser.