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// Half-Baked Code

Can You Spot the Bug?

Code snippets that passed code review but will crash in production. Real bugs from real systems. Test your debugging instincts.

5 challenges
5–15 min each
Real production bugs
#01easy3-5 min

The Event Listener Memory Leak

This WebSocket handler looks clean but will slowly consume all your memory.

Node.jsMemory
58%
solve rate
websocket.jsjavascript
#02medium5-10 min

The Database Connection Leak

This query function works perfectly in testing but will bring down production.

DatabaseNode.jsPerformance
42%
solve rate
queries.jsjavascript
#03hard10-15 min

The Security Hole in String Comparison

This authentication check has a vulnerability that could expose your secrets.

SecurityNode.js
18%
solve rate
auth.jsjavascript
#04hard10-15 min

The Race Condition in Your Cache

This caching logic seems bulletproof but has a subtle race condition.

Node.jsAsync/AwaitPerformance
21%
solve rate
cache.jsjavascript
#05medium5-10 min

The Memory Leak That Passed Code Review

This Node.js stream implementation looks fine but will crash your server under load.

Node.jsMemoryPerformance
34%
solve rate
server.jsjavascript
// new challenges monthly

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