JSON Diff Checker — Compare Two JSON Documents Online

Paste JSON into both panels — original (A) on the left, modified (B) on the right — and click Compare. The diff panel lists every difference with its full dot-notation key path: additions in green, removals in red, and changed values in yellow showing before and after side by side. The toolbar summarises total additions, removals, and changes at a glance.

The comparison is recursive — it drills into nested objects and diffs arrays element-by-element by index. Useful for debugging API version changes, comparing configuration snapshots, and auditing data migration output. All processing is client-side via this free JSON formatter toolkit — neither document is sent to any server. Before comparing, use the pretty JSON formatter to clean up both documents first.