JSON Diff
Compare two JSON objects and visualize the differences side by side with detailed change highlighting.
JSON Diff
Enter JSON in both fields and click Compare to see the differences
About JSON Diff Tool
The JSON Diff tool is a powerful comparison utility that helps you identify differences between two JSON objects. Whether you're debugging API responses, reviewing configuration changes, or validating data transformations, this tool provides a clear, visual representation of what has changed.
The tool performs deep object comparison, analyzing all nested properties and array elements. It uses an intelligent LCS (Longest Common Subsequence) algorithm for arrays to detect not just additions and deletions, but also moved elements. Changes are color-coded for easy identification: green for additions, red for deletions, and yellow for modifications.
This tool is invaluable for developers working with APIs, configuration files, or any JSON data. Use it to compare API responses before and after changes, validate data migrations, review configuration updates, debug data transformations, or document changes between versions.
All comparisons happen entirely in your browser, ensuring your data remains private and secure. The tool handles nested objects of any depth and provides exportable results for documentation or sharing with your team.
Key Features
- Deep nested object and array comparison
- Intelligent array diff with move detection
- Color-coded visual representation of changes
- Real-time JSON validation
- Change statistics (added, removed, modified counts)
- Export results as HTML or copy to clipboard
- Privacy-focused: all processing in browser
- Support for complex nested structures
Frequently Asked Questions
What is JSON Diff and when should I use it?
JSON Diff is a comparison tool that shows the differences between two JSON objects. Use it when you need to compare API responses, review configuration changes, validate data migrations, debug data transformations, or document changes between different versions of JSON data.
How does the array comparison work?
The tool uses an LCS (Longest Common Subsequence) algorithm for arrays, which can detect not only added and removed elements but also moved elements. This means if an item changes position in an array, it's shown as a move rather than a delete and add, making the diff more accurate and easier to understand.
What do the different colors mean?
Green highlights indicate added properties or values that exist in the modified JSON but not in the original. Red highlights show removed properties that existed in the original but not in the modified version. Yellow/orange highlights indicate modified values where a property exists in both but has a different value.
Can I export or save the comparison results?
Yes! You can copy the diff results to your clipboard or download them as an HTML file. The download includes all styling and formatting, so you can open it in any browser or include it in documentation.
Is my JSON data secure when using this tool?
Absolutely. All comparison happens entirely in your browser using JavaScript. Your JSON data never leaves your computer and is never sent to any server. This ensures complete privacy and security for sensitive data.
Can it handle large or deeply nested JSON files?
The tool can handle moderately large JSON files (up to several MB) and recursively compares all levels of nested objects and arrays. For very large files (10MB+), performance may vary depending on your device's processing power.
Pro Tips
- Use the swap button to quickly reverse the comparison direction
- Load the example to see how different change types are displayed
- Use Expand All to see all nested changes at once
- Download results as HTML to share with your team or add to documentation
- The change statistics help you quickly understand the scope of differences