JSON Formatter & Validator
Format, validate, and minify JSON instantly in your browser — nothing is uploaded.
Output
Format and validate JSON online
Paste JSON and it is pretty-printed as you type — no upload, no signup. Everything runs locally in your browser, so even sensitive payloads never leave your machine.
If the JSON is malformed you get a plain-language error instead of a silent failure.
FAQ
Is my data sent anywhere? No — parsing happens entirely in your browser.