JSON Diff — Compare & Highlight JSON Differences Online
Free online JSON diff tool to compare two JSON objects and instantly see differences. Highlights additions, deletions, and modifications with color-coded side-by-side view. Essential for debugging API responses and JSON configuration changes.
How to Use the JSON Diff Tool
Paste JSON on both sides
Paste the original JSON on the left and the modified JSON on the right.
Review the differences
The tool highlights additions in green, removals in red, and changes in yellow.
Use controls to navigate
Toggle Hide Unchanged to focus only on differences, or expand/collapse all nodes.
Generate a report
Click Report to generate a summary of all changes between the two JSON objects.
Frequently Asked Questions
It detects added, removed, and changed values, as well as type changes (e.g., string to number).
Yes. The tool provides a Report feature that generates a text summary of all differences.
Yes. The diff view supports deeply nested objects and arrays with expandable tree nodes.
Yes. Toggle Hide Unchanged to show only the properties that differ between the two JSON objects.
Example Results
Try this sample
Left: {"name":"Alice","age":25} · Right: {"name":"Alice","age":30,"city":"NYC"}
What you'll see
age changed (25 → 30) · city added ("NYC") — 2 changes found
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