Test
Left
.co.uk
← Blog
JSON Utility
Download
JSON
Diff
Compare two JSON documents · Highlight added, removed & changed values
100% client-side · your data never leaves this page
About this tool
✕
Privacy & security
🔒
100% client-side
Runs entirely in your browser. No data sent to any server, nothing stored.
👁️
Open to inspect
Single unobfuscated HTML file — open DevTools to verify.
Run offline
✈️
Download & use locally
Save the file, double-click to open in any browser. No install, no internet.
Download
Compare
Load sample ↓
✕ Clear
⇄ Swap
Tree
Unified
Side by Side
Input
Paste both JSON documents to compare
Original (A)
Paste
Format
Modified (B)
Paste
Format
Ready
Copy diff JSON
Export report
Added
—
Removed
—
Changed
—
Unchanged
—
Click any row to copy path
Diff Result
Copied!