Tips, Fixes & Bugs
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Latest from each series
Stop Using map() for Side Effects
Using Array.map() for side effects leads to confusing code and unnecessary memory usage.
Fix “Too Many Re-renders” Error in React
This error happens when your component keeps updating state inside render, causing an infinite loop.
API Returns Cached Data Even After Update
Your API returns old data even after updating records due to caching issues in browser, CDN, or server.
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Today's challengeAll tips & fixes
19 items7 results
Fix “Too Many Re-renders” Error in React
This error happens when your component keeps updating state inside render, causing an infinite loop.
Fix API Calls Running Twice in React Strict Mode
React Strict Mode can call effects twice in development. Add a guard or make your API action idempotent.
Fix “map is not a function” Quickly
This usually happens when you think a value is an array, but it is actually undefined, null, or an object.
Add loading guard to stop duplicate API calls
One missing loading check can create duplicate records, double payments, or repeated requests.
Fix “Cannot read properties of undefined” instantly
This error happens when you access a property on undefined. Use optional chaining to fix it quickly.
Fix Port Already in Use Error Instantly
Quickly free up a busy port and restart your server without wasting time debugging.
Fix CORS Error in 1 Line (Express.js)
Quickly fix CORS errors in your API by enabling cross-origin requests with a simple middleware.