JSON Formatter & Validator
Pretty-print, minify, or compact JSON and catch syntax errors instantly.
Private by design. Every tool runs 100% in your browser — your code, text, and tokens never leave your device. Nothing is uploaded or stored.
Output
Formatted JSON appears here.
Frequently Asked Questions
Why does my JSON fail to format?
Almost always a syntax error: a trailing comma, unquoted key, or single quotes. The formatter reports the location so you can fix it before parsing.
Should I minify or pretty-print in production?
Minify for transfer size; pretty-print for logs and debugging. The formatter switches between both without changing the data.
Is my data uploaded when I format it?
No. Formatting runs entirely in your browser; the JSON never leaves your device.