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JSON Diff

Paste two JSON documents to see a structural, side-by-side diff — reordered keys are ignored.

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How to use

  1. Paste the original JSON on the left and the changed JSON on the right.
  2. Click Compare to see a side-by-side diff with a similarity score.
  3. Copy the unified diff, or swap the two sides.
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Frequently asked questions

Does key order matter?

No. Both documents are normalized with keys sorted, so reordering the same keys is not reported as a difference — only real structural or value changes are.

What if my JSON is invalid?

You'll get a clear message telling you which side failed to parse, so you can fix it before comparing.

Is my data uploaded?

No. Parsing and diffing run entirely in your browser — nothing leaves your device.

About this tool

JSON Diff is a free, browser-based tool from Tools Platform. It runs entirely on your device — your data is never uploaded to a server, so it stays completely private. There are no accounts, no watermarks, and no limits. Paste two JSON documents to see a structural, side-by-side diff — reordered keys are ignored.