Does the comparator handle deeply nested JSON?

Yes. The diff algorithm recursively compares nested objects and arrays at every depth level.

How are array differences handled?

Arrays are compared index by index. If an element is inserted or removed, subsequent elements will show as changed rather than shifted.

Is my JSON data sent to a server?

No. All comparison logic runs entirely in your browser — no data is transmitted.

What if one or both inputs are invalid JSON?

The tool shows a parse error with the approximate line and column of the problem, so you can fix the input before comparing.

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JSON Diff Comparator

Deep-compare two JSON objects and visualize added, removed, and changed keys.

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About this tool

Paste two JSON documents into the side-by-side panes and instantly see a color-coded diff: green for added keys, red for removed keys, yellow/orange for changed values, and gray for unchanged content. Switch between side-by-side and unified diff views, navigate between differences with prev/next buttons, and see a summary count of all changes.

How to use

1 Step 1: Paste your original JSON into the left pane and the modified JSON into the right pane.
2 Step 2: Click 'Compare' — the diff is computed instantly and highlighted in both panes.
3 Step 3: Check the summary bar for a count of added, removed, and changed keys.
4 Step 4: Use the Prev / Next buttons to jump between each difference, or toggle to unified view.

About this tool

How to use

Frequently Asked Questions