A simple tool that formats, validates, and minifies JSON. Runs entirely in your browser — nothing is sent to a server.
Try it
Why I built this
Most JSON formatters online are bloated with ads or send your data to a server. This one runs 100% client-side — your data never leaves your browser.
How it works
It’s literally three lines of JavaScript:
// Format
JSON.stringify(JSON.parse(input), null, 2);
// Minify
JSON.stringify(JSON.parse(input));The browser’s built-in JSON.parse() handles validation, and JSON.stringify() with the spacing parameter handles formatting. No libraries needed.
Related: Free JSON Key Sorter
Related: Free JSON Path Finder & Tester