What is JSON Diff Tool?
Free online JSON diff tool. Deep-compare two JSON structures, highlighting added, removed, and modified fields. Perfect for API version comparison and config diff analysis.
Use Cases
- ◆API version diff
- ◆Config comparison
- ◆Data migration verification
- ◆Debug comparison
How to Use
- 1Paste original JSON on the left
- 2Paste modified JSON on the right
- 3Click Compare
- 4View highlighted differences
Features
- ✓Deep comparison
- ✓Highlighted diffs
- ✓Nested object support
- ✓Free
FAQ
Can it compare nested JSON?
Yes, supports arbitrarily deep nested objects and arrays.
Will field order changes be flagged?
No — JSON object key order does not matter; only value changes are flagged.
Is this tool free?
Yes — completely free. No accounts, no paywalls. Just open the page and go.
Does my data get sent to a server?
No. Everything runs in your browser. Your data never leaves your device.
Does it work on my phone?
Absolutely. Works great on phones, tablets, and desktops alike.
How fast is it?
Instant for most inputs. Large datasets might take a second or two.