Free JSON Formatter & Validator
Pretty-print, minify and validate JSON instantly. Errors point straight at the problem.
What this does: parses and validates JSON, then pretty-prints or minifies it, entirely in your browser via JavaScript's built-in JSON parser. It is 100% free, needs no signup or paywall, and shows the exact error message when your JSON is invalid so you can find the problem fast.
Frequently asked questions
Is this JSON formatter free to use?
Yes, completely free with no signup and no paywall. Formatting, minifying and validating all happen locally in your browser using JavaScript's built-in JSON parser.
What happens if my JSON has a syntax error?
The tool catches the parsing error and displays the exact error message, which typically points to the character position of the problem, so you can locate and fix invalid JSON quickly.
Is my JSON data uploaded anywhere?
No. Your JSON never leaves your browser. Formatting and minifying use only client-side JavaScript, so the tool works even without an internet connection once the page has loaded.