Guide

Repair LLM JSON Output

AI responses often look like JSON but include markdown fences, comments, Python-style literals, or JavaScript object syntax.

Common LLM JSON problems

Markdown code fences, comments, single quotes, unquoted keys, trailing commas, and Python True, False, or None values can all make an otherwise useful AI response fail strict JSON parsing.

Repair workflow

Paste the response into JSON Fix, run Repair & Format, then run Validate to confirm the output is strict JSON before using it in code or an API request.

Privacy note

The repair happens locally in the browser, which is useful when debugging prompts that include internal examples or private API payloads.