JSON Compare Tool
Compare two JSON objects and see the differences instantly with our free online tool.
All conversions happen in your browser. No data is sent to our servers. Press Cmd/Ctrl + Enter to convert.
How to Compare JSON
Paste your original JSON in the first input panel and the modified JSON in the second panel. Click Compare to see all differences highlighted with clear labels for added, removed, and changed values.
Understanding the Output
The comparison output shows: [+] for added keys/values, [-] for removed keys/values, and [~] for changed values. For changed values, both the old and new values are displayed.
When to Use JSON Compare
Use JSON comparison when reviewing API response changes, debugging configuration differences, comparing database records, or validating data transformations.
Common Use Cases
Developers use JSON comparison for code reviews, testing API changes, debugging data sync issues, comparing environment configurations, and validating migration scripts.
Frequently Asked Questions
What differences does this tool detect?
The tool detects three types of differences: added keys (present in JSON 2 but not in JSON 1), removed keys (present in JSON 1 but not in JSON 2), and changed values (same key but different values).
Does it compare nested objects?
Yes, the tool performs a deep comparison of nested objects and arrays. Differences at any depth are shown with full path notation (e.g., 'user.address.city').
How are array differences handled?
Arrays are compared element by element by index. If arrays have different lengths, the extra elements are shown as added or removed.
Is the order of keys considered?
No, JSON key order is not significant. Two objects with the same keys and values in different orders are considered equal.