Next.js Debugging
Step-by-step debugging guides for Next.js App Router issues, deployment failures, API route errors, hydration mismatches, and environment variable problems.
Why is process.env Undefined in Next.js?
Your API keys work perfectly on localhost, but crash the production build. Stop guessing and fix your Next.js environment variables instantly.
Next.js API Routes Failing in Production? Let's Fix It.
404s, 504 timeouts, and Edge runtime crashes. Here is the exact debugging playbook to rescue your Next.js App Router backend.
Fix: Next.js TypeScript Build Errors & Route Props
Solve compilation errors, resolve missing module declarations, and define type-safe Page props.
Fix: Next.js API Route Blocked by CORS Policy
Stop cross-origin resource sharing errors from breaking your frontend integrations.
Rescuing Failed Next.js Deployments on Vercel
Your app runs flawlessly on localhost, but Vercel rejects the build. Decode the logs and fix the pipeline right now.
ReferenceError: window is not defined in Next.js
The exact debugging workflow to resolve Server-Side Rendering (SSR) crashes caused by browser-only objects.
Next.js Production Debugging: The Ultimate Rescue Guide
Master Next.js troubleshooting. Fix hydration errors, window is not defined, Vercel build failures, and API route timeouts.
Can't Find Your Next.js Error?
Send me your exact error message and I'll help you debug it directly.
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