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🔧FormatKit

JSON Diff & Compare

Compare two JSON objects and highlight differences

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About this Tool

JSON Diff & Compare is a free, privacy-first tool built for developers. Compare two JSON objects and highlight differences

✓100% Client-Side: All processing happens in your browser. No data is ever sent to our servers.

✓Fast & Efficient: Instant results with no server roundtrips or delays.

✓Free Forever: No sign-up, no limits, no hidden fees. Use as much as you need.

✓History: Your recent conversions are saved locally for quick access.

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Disclaimer

This tool is provided for informational and educational purposes only. All processing happens entirely in your browser - no data is sent to our servers. While we strive for accuracy, please verify critical data before use in production environments. FormatKit is not responsible for any data loss, corruption, or issues resulting from tool usage.

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Keyboard Shortcuts

Ctrl+â†ĩCompare JSON
Ctrl+KClear all
Ctrl+ELoad example

How to Use JSON Diff & Compare

Paste or upload two JSON objects to see the differences between them. The tool will highlight added, removed, and modified keys with their values. All processing happens in your browser - no data is sent to our servers.

Features

  • Side-by-side comparison of two JSON objects
  • Detailed diff view showing added, removed, and modified keys
  • Visual summary with color-coded statistics
  • File upload support for both JSON files
  • Swap function to reverse comparison direction
  • Deep comparison for nested objects and arrays
  • Share comparison via URL

Common Use Cases

  • API response comparison: Compare responses from different API versions
  • Configuration diff: See what changed between config file versions
  • Data validation: Verify data transformations maintain correct structure
  • Migration testing: Ensure data integrity during system migrations
  • Code review: Quickly spot differences in JSON data structures

FAQ

Q: Is my data secure?

Yes! All JSON comparison happens entirely in your browser. Your data never leaves your device.

Q: Can it handle nested JSON objects?

Yes! The tool performs deep comparison and will detect differences at any nesting level.

Q: What about arrays?

Arrays are compared element-by-element. Changes in array order or content will be detected.