Compare JSON Objects
Compare two JSON files side-by-side. Highlight differences, additions, and deletions. Perfect for API response debugging and config file changes.
Compare JSON
How to Use JSON Formatter
- 1 Paste the "Original" JSON on the left side
- 2 Paste the "Modified" JSON on the right side
- 3 Differences are highlighted automatically
- 4 Green = additions, Red = deletions
- 5 Use the arrows to navigate between changes
What You Get
Side-by-side JSON comparison with syntax highlighting. Uses the same diff engine as VS Code for accurate, readable results.
Input: Original: {"a":1} Modified: {"a":2}
Output: Shows "a" value changed from 1 to 2
How do I compare two JSON files?
Paste Original JSON on the left, Modified JSON on the right. Differences highlight automatically: green for additions, red for deletions.
Does JSON property order matter when comparing?
No. JSON objects are unordered by specification. We compare semantic content, so {a:1, b:2} equals {b:2, a:1} in our comparison.
How do I find differences in API responses?
Paste expected response on the left, actual response on the right. Differences are highlighted so you can quickly identify what changed.
Can I compare large JSON files?
Yes. The diff engine handles large files efficiently. For extremely large files, comparison may take a few seconds.
How do I navigate between differences?
Use the arrow buttons to jump between changed sections. This makes it easy to review many differences in large files.
100% client-side processing - your JSON never leaves your browser.