How to Debug a Heisenbug That Disappears When You Try to Inspect It
You have a bug. A real nasty one. It crashes the production system, but only when the moon is in…
2026
Why Your Error Boundaries Aren’t Catching Crashes in Production
You added error boundaries to your React app. You tested them locally. Everything looked great. Then you shipped to production,…
7 Common Mistakes That Make Your Error Handlers Useless
Every developer has written a try-catch block and called it a day. You wrap a risky operation, log the error,…
Why Your React App’s State Updates Silently Fail – and How to Catch Them
You've just written a clean `setCount(count + 1)`. The component renders. Nothing moves. No error. No crash. Just... the old…
How to Debug WebSocket Connection Failures in Progressive Web Apps
You are building a Progressive Web App that relies on WebSockets for real time updates. Everything works fine on localhost.…
5 Steps to Debug Any Frontend Bug in Under 10 Minutes
You are staring at a broken CSS layout. The button refuses to change color. Your `useEffect` runs twice and you…
The One Debugging Tool That Saved My Week
Last Tuesday, I spent four hours hunting a bug that turned out to be a single misplaced parenthesis. Four hours…
Why Your Errors Have Different Shapes and What to Do About It
You train a model. You check the residuals. And there they are: patterns you did not expect. Maybe the errors…
Why Your Source Maps Don’t Work in Production and How to Fix Them
Your production error logs show `main.a1b2c3.js:1:12345`. You click the stack trace, and the browser opens a wall of minified code.…
How to Track Down the Elusive ‘Uncaught Promise’ Error That Has No Stack Trace
You open the browser console, and there it is: `Unhandled Promise Rejection` with no file name, no line number, and…