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Rhad ac am ddim JSON Diff

Compare two JSON objects structurally — see exactly which keys were added, removed, or changed, even deep inside nested data. Runs in your browser.

Runs in your browserNo sign-up, no pop-upsNid oes angen mewngofnodiAm ddim am byth

Original (A)

Changed (B)

💡 A structural diff (not line-by-line): it walks both objects and reports exactly which paths were added, removed, or changed — even deep inside nested objects and arrays. Everything runs in your browser.

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Sut Mae'n Gweithio

A line-by-line diff is noisy for JSON because formatting and key order change. This compares the two values structurally and tells you exactly what changed.

1
You paste two JSON values
An original (A) and a changed (B). Both are parsed locally — nothing is uploaded.
2
They're compared by structure
The tool walks both trees recursively, matching keys and array indices regardless of formatting or key order.
3
Differences are listed by path
Each change is reported with its exact path (e.g. user.roles[1]) as added (+), removed (−), or changed (~) with the old → new value.
4
You see a clear summary
Counts of added/removed/changed, then the detailed list — or confirmation that the two are identical.