100% Client-Side • Free • Zero Server Transfer
JSON Diff & Comparison Online
Compare two JSON objects or files online. Semantic, structural JSON diff checker highlights added, removed, and modified keys. 100% client-side privacy.
Deep Structural Diff
JSON Diff Online
JSON A (original)
JSON B (modified)
Diff Output
Paste JSON in both panes and click Compare (or edit โ diff runs live)
Frequently Asked Questions
How does the JSON Diff Checker work?
The tool parses both Left (Original) and Right (Modified) JSON strings into abstract syntax trees, normalizes keys, and performs a deep recursive structural comparison, highlighting added keys in green, removed keys in red, and mutated values in yellow.
What makes JSON diff different from standard text diff?
Text diffs fail when keys are reordered or formatted with different indentation. A semantic JSON diff evaluates pure data equality regardless of whitespace or key order.
Can I compare large API responses side-by-side?
Yes. You can paste raw responses or upload files directly into the left and right panels.
Is any comparison data stored on external servers?
Never. The diff comparison runs entirely in your local browser JavaScript engine.