JSON Diff

The JSON Diff tool compares two JSON objects and shows all differences between them. It identifies added keys (present in B but not A), removed keys (present in A but not B), changed values (different between A and B), and unchanged values.

Yes! The comparison is recursive and detects changes at any depth. Each difference shows its full path using dot notation (e.g., 'config.theme') so you can easily locate changes in complex nested structures.

Green indicates additions (new keys/values in B), red indicates removals (keys/values present in A but not B), and yellow/amber indicates changes (values that differ between A and B). Gray items are unchanged.

By default, key order doesn't affect the comparison — only values matter. You can toggle 'Ignore key order' to explicitly sort keys before comparing, which can make the results easier to read.

Yes. All comparison happens entirely in your browser using JavaScript. Your JSON data is never sent to any server or stored anywhere.

Yes. The diff algorithm performs a deep recursive comparison that detects changes at any nesting depth. Each difference is displayed with its full dot-notation path (e.g., 'config.database.host') so you can immediately locate the change within complex nested structures. You can expand individual diff entries to see the full old and new values for nested objects.

Arrays are compared element by element based on their index position. If an array in JSON B has more elements than JSON A, the extra elements are shown as additions. If it has fewer, the missing elements appear as removals. Elements at the same index with different values are shown as changes. The tool does not attempt to detect moved elements within arrays — reordering items will show up as multiple changes.

The tool does not currently support ignoring specific keys. However, you can use the 'Ignore key order' toggle to normalize key ordering before comparison, which is helpful when key sequence differs but values are the same. For filtering out specific keys, you can preprocess your JSON to remove those keys before pasting, or use the JSON Formatter tool to clean up your data first.