AI Code Debugger

Gemini

Paste buggy code (plus the error/stack trace if you have one) and Gemini will list every bug, explain the root cause, and return a corrected version.

Input

Try:

Buggy code + optional error message0 / 20,000

Debug report

Paste your input on the left and hit Generate

Examples

Undefined map

// Error: Cannot read properties of undefined (reading "map")

function render(users) {
  return users.map(u => u.name).join(", ")
}

render()

About this tool

Paste buggy code (plus the error/stack trace if you have one) and Gemini will list every bug, explain the root cause, and return a corrected version.

Every request is sent server-side to the Gemini 2.5 Flash model with a task-specific system prompt tuned for code work. Your input is not persisted on our servers — we only keep an anonymised metric (task, input length, latency) so we can improve the tool.

Combine this with our other AI developer tools and privacy-first developer utilities to move faster in your day-to-day work.

FAQ

Do I need to include the error message?▾

Not required, but strongly recommended. Pasting the stack trace or error message alongside the code significantly improves the accuracy of the fix.

What kinds of bugs can it find?▾

Logic bugs, off-by-one errors, missing null checks, race conditions, incorrect return types, memory leaks in common patterns, security issues like SQL injection, and more.

Will it rewrite my entire file?▾

It returns a single corrected version of only the code you pasted. Wider architectural refactors should be requested explicitly.

Can it debug across multiple files?▾

Best-effort — paste the relevant snippets from each file with a comment noting the filename.