JSON Formatter
Format, validate, and minify JSON with clear errors.
Paste JSON to instantly format and validate it. Get clear, line-aware error messages when something's off, adjust the indentation, and minify when you need a compact version.
Input
Output
Everything runs locally in your browser — your data never leaves your device.
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Frequently asked questions
- Is my JSON sent to a server?
- No. Formatting and validation run entirely in your browser, so your data stays private.
- Can it minify JSON too?
- Yes. Switch to minify to strip whitespace and produce the smallest valid JSON output.