Data
JSON Compare
Compare two JSON blobs and see exactly what was added, removed, or changed — entirely in your browser.
Everything runs locally in your browser — neither JSON is ever uploaded to a server.
Original JSON
original.json
Modified JSON
modified.json
About this tool
Comprehensive documentation & audit utility guideComparing two JSON payloads by eye — an API response before and after a change, two environment configs, a Lighthouse report from two runs — is error-prone once either one has more than a handful of keys. This tool walks both structures together and highlights exactly what's different: keys only on one side, and values that changed on both.
How it works
1
Paste both JSON blobs
Or load files — nothing is uploaded either way.
2
Compare
Invalid JSON on either side is caught with the exact parser error.
3
Review the diff
Added, removed and changed keys are color-coded inline in the tree.
Key Features & Capabilities
Keys present only on the left (removed) or only on the right (added)
Values that changed, showing old and new side by side
Arrays compared index-by-index
Unchanged branches collapsed by default to cut through the noise