Bug Hunter Lab

Follow the error, not the guess.

21 broken programs across syntax, reference, type, scope, loop, array, object, DOM, async, and mutation bugs. Read the observed behavior, form a hypothesis, fix the code yourself, then reveal the corrected version.

SyntaxErroreasy

The Missing Parenthesis

Observed behavior

Nothing runs at all — not even the parts of the file before the error.

Expected behavior

Logs "Hello, Ada" to the console.

Console / error outputSyntaxError: missing ) after argument list

The Missing Parenthesis · fix the bug

Console

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Tests

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