JSON Formatter
Pretty-print and minify JSON
How to use JSON Formatter
Type or paste your input into JSON Formatter. Everything stays on your device.
Pick your settings and click the action button. JSON Formatter processes everything instantly and locally in your browser.
Copy or download your result immediately. Use JSON Formatter as many times as you like — free forever.
Frequently Asked Questions
Is the JSON Formatter free?
Yes — unlimited formatting and validation, free, with no signup. Everything runs in your browser.
Is my JSON uploaded anywhere?
No. All formatting and validation happen locally in your browser, so you can safely paste JSON containing tokens or personal data.
What does the validator catch?
It pinpoints the line and character of syntax errors like trailing commas, single quotes, unquoted keys, missing brackets and duplicate keys.
Can I minify JSON too?
Yes. Switch to Minify to strip whitespace and produce compact JSON for payloads and configs, or Beautify to indent it for reading.
Is there a size limit?
Because processing is local, the limit depends on your device memory. Large multi-megabyte files format smoothly on modern devices.
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