JSON Repair Tool
Automatically fix broken or invalid JSON
Runs 100% in your browser — nothing is ever uploaded.
What is JSON Repair?
Paste broken JSON and get a valid, pretty-printed version: the repairer fixes single quotes, unquoted keys, trailing and missing commas, JavaScript comments, Python literals (True/False/None), NaN/Infinity and truncated brackets — then re-validates the result with a strict parser.
How to use JSON Repair
- Paste your broken JSON into the input box or click “Load sample” to try it.
- Adjust the options in the toolbar if needed (delimiter, table name, format …).
- Click the convert button — the repaired JSON appears instantly in the output pane.
- Copy the result with one click or download it as a file.
ConvertLab FAQ
Is the JSON repair tool free?
Yes — 100% free, no signup, no limits, no watermarks. Use it as often as you like.
Which errors can it fix?
Single quotes, unquoted keys, trailing/missing commas, // and /* */ comments, Python True/False/None, NaN and Infinity, bare words and unclosed brackets. Truly ambiguous input is reported with a position instead of guessing silently.
Is my data uploaded to a server?
No. The conversion runs entirely in your browser with JavaScript — your data never leaves your device, which makes the tool safe even for confidential files.
Are these converters free?
Yes — every ConvertLab tool is 100% free with no signup, no limits and no ad walls.
Is my data uploaded anywhere?
No. All conversions (JSON, CSV, XML, YAML, INI, .env) run entirely in your browser. Nothing ever leaves your device.
Do these tools work offline?
Yes — once the page is loaded, every converter works without an internet connection.