About JSONSafe

What it does

JSONSafe is four tools in one tab: a formatter/beautifier (with minify, deep key-sort, and configurable indent), a validator that points to the exact line and column of a syntax error, a collapsible tree explorer, and a semantic diff that compares two documents by key and path — telling you what was added, removed, or changed, not just which text lines differ.

Privacy by construction

Everything runs in your browser tab using the built-in JSON parser. There is no upload, no API call, no logging — open your browser's Network tab and confirm it for yourself. This is a direct response to the 2025 incident in which a popular online JSON formatter was found to have retained tens of thousands of user-pasted files, secrets and credentials included. Pasting config or API responses into a random web tool shouldn't be a security event.

Share links stay private too

The diff "share link" encodes both documents directly in the URL fragment (after the #). Browsers never send the fragment to any server, so even a shared comparison never touches ours.

Made by Copper Bay Labs

One of a family of free, no-signup developer tools. See more at Copper Bay Labs. Need something like this built for your team? Copper Bay Tech builds it.