Free Online JSON Formatter & Fixer
JSONFix is a free online tool to format, validate, minify, and fix broken JSON. Paste your JSON, click format, and get clean output instantly. No signup required.
The AI Fix feature uses Claude to repair broken JSON — missing commas, unquoted keys, trailing commas, single quotes, comments, and other common errors that break JSON.parse().
What JSONFix Can Fix
- • Missing or extra commas
- • Single quotes instead of double quotes
- • Unquoted property names
- • Comments in JSON (not valid in strict JSON)
- • Trailing commas after last element
- • Missing brackets or braces
- • Truncated/incomplete JSON