What it is
JSON Formatter is a free in-browser JSON formatter and validator that pretty-prints, minifies, and surfaces parser errors without uploading your data. It is free, requires no signup, and works in any modern browser. Everything runs locally on your device — there is no server-side processing of the data you put into the tool.
Who it's for
It's for developers and data analysts inspecting API responses, debugging configs, or cleaning up a JSON blob pasted from a log line. The tool is designed for quick one-off use: open the page, do the thing, close the tab.
No-tracking promise
- No personal data is collected. The tool does not ask for, store, or transmit your input.
- No advertising or tracking cookies. If we add advertising in the future, the privacy policy will reflect that and a consent prompt will appear where required.
- Privacy-preserving page analytics only — Cloudflare Web Analytics, no cookies, no fingerprinting.
Why we built it
Most tools of this kind are bloated with signups, paywalls, or third-party scripts that exfiltrate the data you paste in. This site is part of a small portfolio of utility sites that try to do the opposite: one job, done well, in the browser, with the source visible and the privacy story explicit.
See privacy policy for the full data story and [email protected] for questions.