JSON Formatter
Easily find and fix errors in your malformed JSON. Our recovery tool identifies syntax mistakes and helps you repair invalid JSON structures for free.
Found this tool helpful?
Support MYNRS and help us build better tools.
How to use Fix Invalid JSON Online
Paste your invalid, broken, or malformed JSON data.
Follow the integrated error markers to the point of failure.
Manually fix the identified issues (like missing quotes or extra commas).
Refresh the validator status as you work to see your progress.
Once repaired, use the "Format" option to clean up the recovered data.
Key Benefits
- Recovering data from corrupted logs or interrupted API transmissions.
- Cleaning up "Smart Quote" errors caused by copying JSON from documents.
- Fixing trailing commas in legacy configurations that don't support ES6+ styles.
- Learning JSON syntax by seeing exactly where your manual edits went wrong.
FAQs
Can you fix my JSON automatically?
We focus on guided repair to prevent accidental data loss. We show you exactly where the error is so you can make the correct fix.
Will this tool work with very large broken files?
Yes, the parser is optimized to find the first blocking error quickly, even in multiline files.
How do I know if my JSON is finally fixed?
The UI will display a green "Success" checkmark and automatically enable the "Prettify" and "Copy" buttons once valid.
Does this tool support comments in JSON?
Standard JSON does not support comments. Our tool follows strict rules, but we provide tips on how to handle non-standard extensions.
Is it safe to paste proprietary code here?
Yes. As with all MYNRS tools, the "fixing" logic is 100% client-side. We never "see" or "save" your broken strings.
You might also need
Other free tools that work great alongside this one
Accelerate Your Workflow
Join thousands of professionals using MYNRS enterprise utilities to save hours every week.
Create Free AccountSupport MYNRS by disabling AdBlock