JSON formatter
Beautify, validate and minify JSON with clear errors.
warming up the tool…
How it works
- 01Paste your JSON.
- 02Choose an indent size, or minify.
- 03Fix any error using the line and column shown, then copy.
Questions
›Is it safe to paste API responses or config with secrets?
Yes. Formatting happens locally in your browser, and nothing is sent anywhere.
›Is my data uploaded anywhere?
No. This tool runs entirely in your browser, and Rounder never sends what you type or drop in to a server, ours or anyone else's. Once the page has loaded, along with any AI model the tool uses, it even works offline.
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