JSON formatter & validator
Check JSON is valid, then make it readable or compact.
Your JSON
0 characters · stays in your browser
Settings
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About JSON formatter & validator
- What does JSON formatter & validator do?
- Check JSON is valid, then make it readable or compact.
- Who is it for?
- Analysts and operations teams moving data between systems, developers who need a quick format conversion, and anyone whose CSV keeps breaking when Excel opens it.
- Is it free?
- Yes. JSON formatter & validator is free with no account, no watermark on your output, no daily cap and no trial period. Because it runs on your own device it costs us nothing to run, which is why there is no catch.
- Is it safe to use with confidential files?
- Yes, and not because we promise to behave. JSON formatter & validator never sends your file anywhere — the work happens in your browser. There is no upload, so there is no copy of your document in our systems at any point.
How to use it
- 1
Enter your text
Paste it into the box above. Nothing is sent as you type.
- 2
Check the settings
Sensible defaults are already chosen. Most people never need to change them.
- 3
Run it
The progress bar shows real progress, not a decorative animation. Everything happens on your device.
- 4
Preview the result
Look at the output before you download. If it is not right, adjust a setting and run it again — nothing has been saved anywhere.
- 5
Download
Save the file. Closing this tab discards it from memory, so download anything you want to keep.