JSON Diff Online — Compare JSON Free
Free online JSON diff tool. Paste two JSON objects and see differences highlighted instantly. Works offline, no data leaves your browser.
Original JSON
Modified JSON
Ready to Compare
Paste your JSON data in both text areas above to see the differences.
Frequently Asked Questions
What is JSON comparison and why do I need it?
JSON comparison helps you identify differences between two JSON objects or arrays. It's essential for debugging API changes, validating data transformations, tracking configuration updates, and ensuring data consistency across different environments.
How does array comparison work?
By default, array order is ignored for comparison, meaning [1,2,3] and [3,1,2] are considered equal. You can use "Advanced Options" to configure array matching rules based on specific fields like IDs, or customize other comparison behaviors.
Can I compare large JSON files with this tool?
Yes, this tool handles large JSON files efficiently. All processing happens locally in your browser, so there are no server-side size limitations. However, very large files (>50MB) may take longer to process depending on your device's performance.
Is my JSON data secure when using this tool?
Absolutely! This tool is completely secure and private. All JSON comparison happens locally in your browser - no data is sent to external servers. Your JSON content never leaves your device, ensuring complete confidentiality.
What happens if my JSON is invalid?
The tool includes built-in JSON validation and will highlight syntax errors with helpful error messages. Invalid JSON will be flagged immediately, and the comparison won't run until both inputs contain valid JSON syntax.
Can I export or share the comparison results?
Yes! You can copy the results to your clipboard or download them as a file. The exported results include all differences, statistics, and can be used for documentation, code reviews, or sharing with your team.