JSONSafeFormat, validate & diff JSON — privately
Format, validate, tree-explore and semantically diff JSON entirely in your browser tab. Nothing is ever uploaded.
Paste JSON in the Format tab — the tree mirrors it here.
Why JSONSafe exists
In 2025, a widely-used online JSON formatter was found to have retained 80,000+ user-pasted files — including cloud keys, database passwords, and internal credentials — on its servers. JSONSafe does the opposite by design: every byte you paste is parsed and rendered in this browser tab. There is no upload, no request, no log. Open your network tab and check.