Debug Dungeon

Welcome to the Debug Dungeon! 🐛 Test your debugging skills by spotting bugs in real-world code examples. Each challenge includes helpful hints and a detailed solution. Perfect for sharpening your coding detective skills! 🕵️‍♀️

How it works:

🐛

Find the Bug

Study the code and spot what's wrong

Use Hints

Stuck? Expand hints for guidance

✅

Check Solution

See the fix and learn why it works

🔴hard

TypeScript/React

TanStack Query: Cache Invalidation Mismatch

Cache Invalidation

Your mutation succeeds, the toast shows up, but the UI stays stale. You call invalidateQueries, the cache is there... but nothing happens. Turns out React Router params and database IDs don't play nice together.

1/13/2026

Start debugging →

🟡medium

React/Ionic

The IonRouterOutlet Redirect Bug

Router Navigation

A subtle navigation bug where URL changes but the page stays the same in Ionic React apps. Can you spot why the redirect doesn't work as expected?

12/19/2024

Start debugging →