🧾 JSON Structure Diff — Keys Added and Removed
Paste two JSON values. The diff walks objects and arrays and reports paths that were added, removed or changed, without uploading the documents.
Input
Result
Counts
Private by design. This tool runs entirely in your browser — nothing you enter or add is uploaded to any server.
How it works
- Paste the original JSON on the left and the updated JSON on the right.
- Press Compare JSON. Both sides must be valid JSON values.
- Read added, removed and changed paths. Array indexes are included in the path.
Examples
- Adding a role field reports role as added.
- Changing name from Ada to Ada Lovelace reports name as changed.
- Removing id reports id as removed.
Frequently asked questions
Does key order count as a change?
No. Object key order is ignored. Only presence and JSON values are compared.
How are arrays compared?
Arrays are compared by index. A longer array reports extra indexes as added.
Is the JSON sent to a server?
No. Parsing and comparison run locally after the page loads.
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