11 articles
You click a button, the UI updates instantly — then snaps back a second later. Optimistic updates that roll back unexpectedly are a common React pain point. Here's how to diagnose and fix them reliably.
Passing an object literal directly as a React prop looks harmless, but it creates a new reference on every render — triggering a cascade that crashes your app. Here's exactly why it happens and how to fix it for good.
Your WebSocket works fine in local dev but drops every 60 seconds in production. The culprit is almost always Nginx's default proxy timeout — and the fix is three lines of config once you know where to look.
You just pushed a critical fix to production, but users are still seeing the old version. Your service worker is serving stale cache. Here's exactly why it happens and how to fix it permanently.
Storing JWTs in localStorage feels convenient until an XSS vulnerability exposes every token on your site. Here's how to migrate your authentication to HttpOnly cookies — and why it matters more than you think.
Your useEffect runs twice in development but exactly once in production — and it's not a bug in your code. React's Strict Mode intentionally double-invokes effects to help you catch subtle issues. Here's what's happening and how to handle it correctly.
A fetch call with no timeout will wait forever if the server stalls or drops the connection silently. Learn exactly why this happens and how to implement abort-based timeouts, retry logic, and proper error handling in JavaScript.
Dynamically injected web fonts are one of the sneakiest sources of Cumulative Layout Shift. Learn how to diagnose the root cause and apply targeted fixes that keep your CLS score low without sacrificing typography.
CORS errors that vanish in development but blow up in production are one of the most frustrating debugging experiences in web dev. Here's why they happen and how to fix them for good.
You add a Tailwind class, nothing changes. You add !important everywhere, things break worse. CSS specificity conflicts are the silent killer of utility-first styles in production — here's how to diagnose and fix them for good.
Learn why JavaScript's structuredClone() cannot clone functions, DOM nodes, and symbols, how these failures occur, and the best alternatives for safely copying complex objects in modern web applications.