JSON Diff
Paste two JSONs and see exactly which keys were added, removed, or changed — visualized as a colored tree.
How to Use
Left = "before", right = "after". The diff updates as you type.
Green = added, red = removed, yellow = value changed, gray = unchanged. Big objects become quickly scannable.
The summary card on top counts how many keys were added, removed, and changed (or tells you nothing changed).
FAQ
How are arrays compared?
Compared by index. ["a", "b"] vs ["b", "a"] reports both indices as changed. Sort first if order doesn't matter.
What if the value is the same but the type differs?
Strict equality (===), so "123" (string) ≠ 123 (number). Types must match too.
What if I enter invalid JSON?
Syntax errors highlight in red on the affected pane. With one side empty, the other is treated as fully added/removed.
Can it handle large JSON?
Up to ~1MB processes comfortably in the browser. Larger inputs may briefly stall the page.
Is anything sent to a server?
No. All comparison happens in your browser; the JSON never leaves the page.
