JSON Fixer / Repair
Repair broken JSON — single quotes, unquoted keys, trailing commas, comments and Python literals.
About JSON Fixer / Repair
JSON Fixer repairs the most common JSON mistakes — single quotes, unquoted keys, trailing commas, comments, and Python-style True/False/None — then validates the result by parsing it.
How to use JSON Fixer / Repair
- 1Paste or type your data into the input box above (a sample is pre-filled so you can try it instantly).
- 2Adjust any options on offer — delimiter, columns, formatting and so on — to match what you need.
- 3Repairing happens instantly as you type; review the result in the output panel.
- 4Click Copy to grab the output or Download to save it as a file — JSON Fixer / Repair keeps everything on your device.
Why use JSON Fixer / Repair?
- ✓Cleaning up hand-edited or copied JSON that won't parse
- ✓Converting a JavaScript object literal into valid JSON
- ✓Fixing config or API snippets with comments and trailing commas
- ✓100% free with no sign-up, no watermark and no usage limits
- ✓Runs entirely in your browser — your data is never uploaded or stored
- ✓Works offline once loaded, with instant results and one-click copy or download
Frequently asked questions
What does it fix?+
Single-quoted strings, unquoted object keys, trailing commas, line and block comments, and Python literals (True, False, None) are all corrected to valid JSON.
How do I know it worked?+
The repaired output is validated by actually parsing it; if something still can't be fixed, you get a precise error message instead of silent corruption.
Is it free to use?+
Yes — it is completely free with no sign-up, no account and no usage limits. There is no watermark and no paywall, so you can process as many files as you like.
Is my data private and secure?+
Yes. This tool runs entirely in your browser using client-side JavaScript — your data is never uploaded to a server, stored or logged. Once the page has loaded you can even use it offline, which makes it safe for confidential or proprietary files.
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