JSON Formatter & Validator
Pretty-print, validate, and minify JSON without your data leaving the browser.
Frequently asked questions
Is it safe to paste API responses with tokens here?
The formatter runs entirely in your browser with JavaScript. Nothing you paste is transmitted or logged. Still, as a habit, avoid sharing tokens anywhere you don't control.
What do the error messages mean?
The validator uses your browser's native JSON parser and reports its exact error, plus the position where parsing failed — usually a missing comma, an unquoted key, or a trailing comma.
What is minified JSON for?
Minifying removes all whitespace, shrinking payload size for APIs and config files where humans don't need to read the raw text.