json

JSON Diff Checker

Compare two JSON objects and highlight differences

Original JSON (left)

Modified JSON (right)

About JSON Diff Checker

Free online JSON diff tool. Paste two JSON objects side by side to instantly see what was added, removed, or changed. Browser-based, no data sent to servers.

How to Use

1Paste the original JSON into the left panel
2Paste the modified JSON into the right panel
3The diff appears instantly below — green for additions, red for deletions
4Check the summary for total additions and deletions

Frequently Asked Questions

What is a JSON diff tool?+

A JSON diff tool compares two JSON objects and highlights the differences between them — showing which lines were added (green), removed (red), or unchanged.

Does the order of keys matter?+

No. Both inputs are parsed and re-formatted with consistent key ordering before comparison, so only meaningful data differences are highlighted.

Can I compare JSON arrays?+

Yes. The tool handles any valid JSON — objects, arrays, strings, numbers, or booleans.

Is my data secure?+

Yes. Everything runs in your browser. Your JSON is never sent to a server.

What do the colors mean?+

Green lines are additions (exist only in the right/new JSON). Red lines are deletions (exist only in the left/old JSON). Unchanged lines appear in the default text color.

Get all tools in your browser

Install the Chrome extension for one-click access to every tool — no tab switching needed.

Add to Chrome — Free

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Last updated: January 2025