Does key order matter?
No. Objects are compared by key, not by the order keys appear in the file.
jfmt.dev
JSON Diff
Paste left and right JSON to list every added, removed, and changed path. Built for API payloads, config reviews, and snapshot tests.
JSON formatter
Input
Output · preview.json
{ }
Run a tool to see a polished result here
How the diff works
Both sides are parsed, then compared as trees. You get a path-level report, not a line-by-line text diff — so key order and whitespace do not fake a change. Processing stays local.
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FAQ
Can I diff huge files?
The editor is meant for typical API and config sizes. Extremely large trees may feel slow in the browser.
Is either side uploaded?
No. Both documents stay in memory on this device.