JSON Formatter
Free online JSON formatter, validator, and minifier — paste JSON to format with proper indentation, validate syntax, or minify. Runs entirely in your browser.
JSON Formatter is a free online developer tool from FastDailyTools (Format, validate, and minify JSON.). Free online JSON formatter, validator, and minifier — paste JSON to format with proper indentation, validate syntax, or minify. Runs entirely in your browser. It runs entirely in your browser — no sign-up, no account, no email and no upload — and every result can be exported as a dated PDF report.
- ✔ Price: free, unlimited use, no rate limits
- ✔ Sign-up: not required
- ✔ Privacy: all math runs client-side, nothing is uploaded
- ✔ Export: one-click PDF report (2026 rates)
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How to use JSON Formatter
- Paste JSON.
- Click Format, Minify, or Validate.
- Copy the result.
Frequently asked questions
Is my JSON sent to any server?
No. Everything runs in your browser — your data never leaves your device.
What does 'Invalid JSON' mean?
Usually a missing comma, unquoted key, trailing comma, or unescaped quote. The validator highlights the line for you.