Simulate Next.js build output with page compilation, bundle optimization, and static generation. Perfect for React framework demos and frontend CI/CD pipeline testing.
Press Ctrl + C to exit. Output is simulated for demo purposes only.
This module simulates compile phase, page sizes, and bundle output log events with realistic pacing.
It is designed for demos, log pipeline testing, and documentation where the real stack is unavailable.
All output is generated locally in the browser and is safe to run.
info - Creating an optimized production build... info - Compile phase starting... |-- /pages/index.tsx 5.2 kB 0.12s warn - Missing meta description tag in /pages/blog/[slug].tsx Compiled successfully in 12.34s Pages: 42
No. It is a simulator that prints log text only.
Yes. The CLI supports speed and repeat options, and the web page can be refreshed.
No. It does not install, update, or modify anything.
Next.js build output includes compile phase, page sizes, and optional warnings. It is familiar to anyone running next build in CI or locally.
This simulator reproduces that style for testing dashboards and log processors or for demos without building a real Next app.
Popular questions and answers from Stack Overflow related to Next.js build.
Check import paths (case-sensitive on Linux), verify package is in dependencies, clear .next folder and node_modules, run npm install again. For aliases, check jsconfig.json or tsconfig.json paths.
getStaticProps runs at build time (SSG) - best for static content. getServerSideProps runs on every request (SSR) - best for dynamic data. SSG is faster but SSR shows fresher data.
Use SWC (default in Next 12+), enable incremental builds, analyze bundle with @next/bundle-analyzer, code-split with dynamic imports, cache node_modules in CI, use turbo for monorepos.
For static export, set images.unoptimized: true in next.config.js. Or use custom loader. Issue occurs because static export cannot optimize images at request time.
Install @next/bundle-analyzer. In next.config.js, wrap config with analyzer. Run ANALYZE=true npm run build. Opens interactive treemap showing module sizes.
ISR allows static pages to be updated after build. Add revalidate property to getStaticProps. Pages regenerate in background while serving stale content. Balances SSG speed with freshness.
Increase Node memory: NODE_OPTIONS="--max-old-space-size=4096" npm run build. Analyze bundle for large dependencies. Use dynamic imports. Consider moving to server components in Next 13+.
NEXT_PUBLIC_* vars are exposed to browser (baked in at build). Server-only vars are not prefixed. Use .env.local for local dev, .env.production for production. Runtime vars need getServerSideProps.
Common fix: transpilePackages in next.config.js. For ESM issues: use next/dynamic with ssr: false. Check package compatibility with your Next.js version. Some packages need client-only rendering.
output: "standalone" creates minimal production bundle. output: "export" generates static HTML (no server). Default is server mode. Standalone is useful for Docker deployments.
Popular video tutorials to learn more about Next.js build.
Vercel
Complete Next.js tutorial covering App Router, server components, data fetching, and production deployment strategies.
Watch on YouTubeLee Robinson
Speed up Next.js builds with bundle analysis, code splitting, image optimization, and deployment best practices.
Watch on YouTube
