CodeFixern — Polyglot Code Diagnostics & Execution

Drop a file to ingest — choose file

detecting… 0 lines · 0 chars Ctrl/⌘+Enter to run

idleStart typing or load a file — static diagnostics run automatically.

Terminal

Agent Log

Diff

Press Run to execute the active tab. Python, JavaScript and SQL run instantly in your browser — no login, no key. Other compiled languages need a free RapidAPI Judge0 key (Settings ⚙).

DIAGNOSTICIAN

Runs locally in your browser — bracket/quote balance, indentation and common structural checks. Always on, no key needed.

CODER

Produces a healed version and an optimized version. Requires your own Anthropic API key (see the settings gear) — nothing is sent anywhere without it.

No AI agent key configured. to enable real fix & optimize passes.

Run the Coder agent to see a line-by-line healed diff here.