Intelligent JSON comparison that understands structure, not just text. See exactly what was added, removed, or changed with color-coded highlighting and JSONPath navigation.
Our JSON comparison tool goes beyond simple text diff to understand JSON structure and provide meaningful, actionable differences.
Understands JSON structure, not just text. Object key order doesn't matter, but array order does.
Detects when array elements are reordered, showing 'moved from index X to index Y' context.
Each difference shows its JSONPath location for easy identification in large files.
Green for added, red for removed, amber for changed, purple for type changes.
Summary of total additions, removals, changes, and type changes at a glance.
Use arrow keys to quickly navigate between differences in the diff list.
The comparison tool categorizes every difference into one of four types, making it easy to understand exactly what changed.
New keys or values present in the modified JSON but not in the original
Modified has "newField": true that original doesn't have
Keys or values present in the original JSON but missing from the modified
Original has "oldField": false that modified doesn't have
Same key exists in both but with a different value
"count": 5 in original → "count": 10 in modified
Same key exists in both but the value type is different
"id": "123" (string) → "id": 123 (number)
Array element exists in both but at a different position (array order matters)
"a": [1,2,3] → "a": [2,1,3] shows 1 moved from [0] to [1]
JSON comparison is essential for many development and debugging workflows.
Compare API responses before and after changes to verify data is correct
Track changes between config file versions across environments
Ensure data was migrated correctly by comparing source and destination
Review JSON schema or fixture changes in pull requests
Compare expected vs actual output to identify where things went wrong
See exactly what dependencies were added, removed, or updated
Everything you need to know about comparing JSON files online.
Semantic JSON diff understands JSON structure instead of just comparing text line-by-line. This means reordered keys in objects won't show as changes, array modifications are tracked intelligently, and you see meaningful differences like 'value changed from X to Y' rather than just 'line removed, line added'.
Our tool understands that array order matters in JSON. When elements are reordered, it detects this and shows them as 'moved' with the exact position change (e.g., 'moved from index 0 to index 2'). When an element is deleted, only that deletion is shown - not every subsequent element as 'moved'.
No, object key order doesn't matter in JSON comparison. {"a": 1, "b": 2} is semantically equal to {"b": 2, "a": 1}, so our tool treats them as identical. However, array element order DOES matter - [1, 2] is different from [2, 1], and we show exactly which elements moved.
Yes, completely. All comparison processing happens in your browser using JavaScript. Neither of your JSON files is ever uploaded to any server. This makes it safe for comparing configuration files containing API keys, secrets, or sensitive data.
The tool detects five types of differences: Added (new keys/values), Removed (deleted keys/values), Changed (same key, different value), Type Changed (e.g., string to number), and Moved (array elements that changed position with exact from/to indices).
Yes! The diff list shows all differences and you can click any item to jump directly to it. You can also use keyboard shortcuts (arrow up/down) to navigate between differences. The current difference is highlighted in both panels.
Simply paste your original JSON in the left panel and your modified JSON in the right panel, then click 'Compare'. The tool will analyze both files and show you all differences with color-coded highlighting: green for added, red for removed, amber for changed.
Yes! Since all processing happens in your browser, there's no upload size limit. The tool uses efficient algorithms (LCS for line alignment, similarity matching for arrays) to handle large files quickly. Performance depends on your device's memory and processing power.
Our intelligent algorithm uses multiple techniques to give you accurate, meaningful diffs.
Both JSON files are parsed and validated. Invalid JSON is highlighted with error messages so you can fix it before comparing.
The tool recursively compares objects and arrays. Object keys are compared regardless of order. Array elements are matched using the LCS algorithm.
Each difference is classified as Added, Removed, Changed, Type Changed, or Moved. Results are displayed with JSONPath for easy navigation.
For arrays, we use LCS to find elements that maintained their relative order. This prevents showing every element as "moved" when you just delete one item.
When objects in arrays are modified, we use similarity scores to match them correctly. This lets us show what changed inside the object rather than "removed + added".
Both JSON files are compared entirely in your browser. Neither file is ever uploaded to any server. This makes it safe for comparing config files with secrets, API responses with user data, or any other sensitive information.