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JSON Fixer
Paste malformed JSON and get valid, pretty-printed JSON back. JRJI repairs the most common mistakes automatically — right here in your browser.
Input — paste broken JSON
Output — valid JSON
Paste JSON and hit “Fix JSON”.
Trailing commas
Strips the comma before } or ].
Unquoted keys
Wraps bare object keys in double quotes automatically.
Comments & quotes
Removes // and /* */, normalizes quotes.
Related tools
JSON Fixer FAQ
What kinds of broken JSON can it fix?
Trailing commas, unquoted object keys, single quotes instead of double, and JavaScript-style // and /* */ comments. It also pretty-prints already-valid JSON.
Is my JSON sent to a server?
Never. The repair runs entirely in your browser tab. Close the page and the data is gone.
Why does it sometimes say it cannot repair?
It is a best-effort heuristic, not a full parser. Deeply malformed input (e.g. mismatched structural braces) may need manual correction.