Paste messy JSON and get it cleanly formatted — or instantly see exactly where it's broken. Free, private, runs in your browser.
Paste any JSON and it's formatted as you type — pick 2-space, 4-space, or minified output. If the JSON is broken, you get the exact parser error instead of a silent failure, so you can find the trailing comma or missing bracket fast.
It runs entirely in your browser, so API responses, config files, and anything sensitive never get uploaded to a server. Validation uses the browser's native JSON parser, so "valid here" means valid everywhere.