The ProdFix Blog

Fetch doesn't throw on 4xx/5xx responses. Here's the complete error handling pattern for production JavaScript.

Server Actions need different error handling than API routes. Here's the production-safe pattern.

Optional chaining prevents the most common JavaScript error. Here's how to use it correctly without hiding real bugs.

React Query simplifies data fetching but has tricky error handling. Here's how to do it right in production.

Janky scrolling drives mobile users away. These are the JavaScript patterns that cause it and how to fix them.

State management errors in Zustand and Redux are subtle and hard to reproduce. Here's what to monitor.

JavaScript floating point and integer precision bugs appear in financial calculations, statistics, and more. Here's how to catch them.

The complete pre-deployment checklist for Next.js apps in 2025. Covers performance, security, monitoring, and edge cases.

Next.js middleware runs on every request. Here's what breaks in production and how to debug it.

Next/image is powerful but misconfigured it slows you down. Here's the complete optimization guide for production.

API routes are where most Next.js production bugs hide. These best practices prevent the most common failures.

Incremental Static Regeneration sounds simple but has subtle production behaviors. Here's what actually breaks.

Edge runtime is fast but limited. Here's what breaks when you deploy edge functions and how to work around limitations.

i18n in Next.js introduces routing and rendering bugs that only appear with real user data. Here's how to catch them.

Vercel deployments fail in specific ways. Here's the complete guide to diagnosing and fixing every common Vercel error.

Authentication in Next.js has more edge cases than you think. Here's the production-tested pattern.

Serverless Next.js functions exhaust database connections. Here's how connection pooling saves you.

React 18 concurrent features change rendering behavior. Here's what breaks in production after the upgrade.

Context re-renders cause invisible performance degradation at scale. Here's how to detect and fix it.

React Native production errors are different from web. Here's what breaks and how to monitor React Native apps.

Tailwind purges unused classes in production. Here's why classes disappear and how to prevent it.

Every KB you add to your bundle slows your LCP. Here's how to audit and reduce bundle size systematically.

Safari has unique JavaScript behavior that breaks apps working perfectly in Chrome. Here's the list and the fixes.

Most SaaS users are on desktop but mobile performance still affects SEO and some conversions. Here's what to optimize.