What types of changes does the JSON diff tool detect?

The tool detects three types of changes: added fields (present in new but not old), removed fields (present in old but not new), and modified values (same key but different value).

Does the tool handle nested JSON objects?

Yes, the diff tool recursively compares nested objects and arrays, showing you exactly where changes occur at any depth level.

Is my JSON data secure when comparing?

Yes, all comparison happens entirely in your browser. Your JSON files never leave your device and are not uploaded to any server.

JSON Diff Tool

Compare two JSON files and see exactly what changed: added, removed, and modified fields. Great for API version changes, config updates, and debugging regressions. Processing stays in your browser.

description JSON A (Old)

Paste JSON or upload a .json file.

upload_file Upload

description JSON B (New)

Paste JSON or upload a .json file.

upload_file Upload

Show unchanged

difference Diff Results

Paths are shown in dot notation (arrays use [index]).

Added

Removed

Modified

Paste two JSON documents above and click Compare JSON.

How it works

Added: the field exists in JSON B but not in JSON A
Removed: the field exists in JSON A but not in JSON B
Modified: the field exists in both, but the value changed

For arrays, Owly compares items by index (items[0], items[1], etc.). If you need smarter array matching (by id/key), tell me the matching rules and I’ll extend the tool.