Technical Engineering Blog
Production-grade debugging guides and architectural teardowns for React, Next.js, Flutter, and Node.js.
Why is process.env Undefined in Next.js?
Why are Next.js environment variables undefined in production? Learn how to debug NEXT_PUBLIC_ prefixes, Vercel settings, and build-time vs runtime variables.
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Next.js API Routes Failing in Production? Let's Fix It.
API returning 404, 500, or timing out in Vercel? Debug and fix Next.js App Router Route Handlers, Edge runtime mismatches, and CORS errors instantly.
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Direct URL Works Locally But Returns 404 After Deployment
Stop the 404 Not Found error on page reload in React, Vite, and SPAs. Learn how to configure rewrites for Vercel and Firebase Hosting to fix React Router issues.
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Fix: React useEffect Infinite Loops and Re-renders
Is your React component hitting an infinite re-render loop? Learn how to debug useEffect dependency issues and prevent browser crashes.
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Fix: Node.js MongoDB Connection Refused & Timeouts
Struggling with Mongoose or MongoDB connection refused errors in Node.js? Learn how to debug MongoServerSelectionError and network connectivity timeouts.
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Fix: Next.js TypeScript Build Errors & Route Props
Getting TypeScript compilation errors when building Next.js? Learn how to fix page component props types and import path errors.
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