Contrast compares two JSON documents by structure — not line by line — and shows exactly what was added, removed or changed, key by key. Far clearer than a text diff when the formatting or key order differs. Nothing is uploaded.

Original (A)

Changed (B)

Objects are matched by key and arrays by index. A change of type or value is shown as “changed”; keys only in A are “removed”, keys only in B are “added”. Both sides must be valid JSON. Everything runs on your device.