JSON Diff
Compare two JSON documents by structure and see exactly which keys were added, removed or changed, ignoring key order and formatting.
Files are processed in your browser and are never uploaded to a server.
How to use
Free to use with no sign-up, no install and no usage limit.
Paste the old JSON on the left and the new one on the right. The result lists every difference as a path, so you can jump straight to the key that moved.
Key order and whitespace are not differences. A plain text comparison marks two identical objects as completely different when a serialiser reorders the keys, which is exactly the case this tool exists for.
Each difference is one of three kinds: a key that only exists on the right was added, a key that only exists on the left was removed, and a key present on both with a different value was changed.
Arrays are compared by position. Element zero is compared with element zero, and a longer array reports its extra elements as added. An item inserted at the front therefore shifts everything after it — worth knowing before reading a long list of changes.
A missing key and a key set to null are reported differently, because an API that drops a field and an API that returns null for it are not doing the same thing.
Paths use the familiar $.a.b[0] form, and keys that cannot be written with a dot are quoted in brackets.
Nothing you paste is sent to a server. Everything is compared inside your browser.