JSON Diff Comparator — Free Online Tool
Paste two JSON objects to see exactly how they differ. Shows both a line-by-line text diff (additions in green, deletions in red) AND a structural summary listing added keys, removed keys, and value changes across nested objects and arrays. Validates both inputs before diffing.
100% client-side. No uploads. Your data never leaves your browser.
How to use JSON Diff Comparator
- Paste original JSON in the left pane.
- Paste modified JSON in the right pane.
- Click 'Compare' to compute the diff.
- View 'Visual Diff' for line-by-line or 'Summary' for structural changes.
Frequently Asked Questions
What's the difference between this and a text diff?
A text diff shows every character change. JSON diff understands structure — it reports which keys were added, removed, or modified regardless of formatting.
Does this handle nested objects and arrays?
Yes. The structural summary recursively walks nested objects, reporting paths like 'user.profile.avatar' and 'items[2].name'.
What happens if an input is invalid JSON?
The tool validates both inputs and shows a parse error before attempting the diff.
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