JSON compare
Paste two JSON documents and see what differs: added, removed and changed values, each with a path you can copy. Key order is ignored, numbers keep every digit, and duplicate keys are reported instead of silently dropped.
Everything runs in your browser. Nothing you paste is sent anywhere or saved: this page is served with a Content Security Policy that stops it from opening connections (connect-src 'none'), and it has no analytics or ads. Open your browser's Network tab to check that no request carries what you paste.
How to use
Paste or drop a file on each side and press Compare. Every change shows its path in the form $.orders[2].total; click the path to copy it. Use n and p to move between changes. "Arrays by key" matches array items by the value of a key such as id, so a reordered list shows only real changes.