How to Fix CORS Errors (and Actually Understand Them)
That red "blocked by CORS policy" message is the browser doing its job. Here is what it protects, why preflight requests fail, and how to fix CORS on the server for good.
Read →
Tips & writing
Notes from the workbench
Practical engineering tips, design theory and performance breakdowns — written for developers and founders who like their advice tested in production.
Filtering by tag #debugging — clear
Localhost vs 127.0.0.1 in .env: The Bug That Only Appears on Windows
Same code. Same .env. Works on my Linux box, dies on the Windows server with ECONNREFUSED ::1:3306. Here's what localhost actually does under the hood, why 127.0.0.1 is not always the same thing, and the rules I now follow in every .env file.
Read →
Why Your React useEffect Runs in a Loop (and How to Fix It)
An effect that fires forever, runs twice, or reads stale state. Here is what is actually happening with React's useEffect dependencies, and the patterns that make effects predictable.
Read →
Async/Await Mistakes That Quietly Break JavaScript Apps
Missing awaits, await inside forEach, accidental waterfalls and swallowed errors. The async/await bugs that pass code review and fail in production, with the fix for each one.
Read →
How to Debug Code Systematically: A Method That Works on Any Bug
Debugging is not about being clever. It is a repeatable process: reproduce, observe, narrow down, fix the cause, and prove it. The method experienced developers use on any bug.
Read →
How to Read Error Messages and Stack Traces Like a Senior Developer
Error messages look like noise until you know where to look. How to read the message, find your line in the stack trace, decode common errors, and turn a wall of red into a fix.
Read →
5 Free Tools That Quietly Make You a Better Full Stack Developer
You don't need a paid stack to build and debug real applications. These five free tools cover API testing, database inspection, error tracking, and version control, the parts of the job that eat up time when you're doing them the slow way.
Read →