JSON Diff
Compare two JSON objects side by side. Instantly spot added, removed, and changed values with color-coded diff view. Process structured data directly in your browser with no file uploads to.
Original JSON
Modified JSON
What is JSON Diff Tool | Rune
JSON Diff compares two JSON documents and highlights every difference, added keys, removed keys, and changed values. Essential for debugging API response changes, comparing configuration versions, and reviewing data migrations. Handles complex data structures with nested objects, arrays, and special characters without data loss.
Supports large files with optimized parsing that processes thousands of records efficiently. Preview converted data in a formatted view before downloading or copying to your clipboard. This tool runs entirely in your browser, requiring no software downloads or installations on your device. All processing is handled locally in your browser.
Key Features of JSON Diff Tool
Everything you need for professional json diff tool
Deep Comparison
Recursively compares nested objects and arrays, detecting changes at every level of the JSON structure.
Color-Coded Diff
Green for added, red for removed, yellow for changed values, instantly see what's different.
Clear Visual Output
Side-by-side display with path indicators showing exactly where each difference occurs.
Diff Statistics
Summary counts of added, removed, and changed items for quick impact assessment.
Copy Diff Report
Copy the complete diff results for use in code reviews or documentation.
Privacy Safe
All comparison happens locally in your browser. Your data never leaves your device.
How to Use JSON Diff Tool
Follow these simple steps to get started
Paste JSON A
Paste the original or baseline JSON document in the left panel.
Paste JSON B
Paste the modified or comparison JSON document in the right panel.
View Differences
Click compare to see all differences highlighted with color coding.
Pro Tips
- Compare API responses before and after changes to verify your updates work correctly.
- Use JSON Diff to review configuration file changes before deploying to production.
- Load sample data to see how the diff visualization works before using your own data.
- The path column shows the exact JSON path to each change for easy location.
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Frequently Asked Questions
Everything you need to know about JSON Diff Tool
What types of changes does it detect?
The tool detects three types of changes: added keys/values (present in B but not A), removed keys/values (present in A but not B), and changed values (same key, different value).
Does it handle nested JSON?
Yes, the comparison is recursive, it walks through every level of nested objects and arrays to find differences.
How are array differences shown?
Arrays are compared element by element using index position. Added, removed, or changed array elements are highlighted accordingly.
Is my data safe?
Yes. All comparison happens in your browser. No data is sent to any server.
Can I compare large JSON files?
Yes, the tool handles large JSON documents efficiently. Very large files with deep nesting may take a moment to process.
Does it format the JSON first?
The input JSON is parsed and validated. Formatting differences (whitespace, indentation) are ignored, only structural and value changes are reported.
Is JSON Diff Tool free?
Yes! JSON Diff is 100% free with unlimited comparisons. No sign-up needed, just paste your JSON and compare instantly.
Can I use it to compare API responses?
Absolutely. JSON Diff is perfect for comparing API responses across environments (dev, staging, production), spotting configuration changes, and debugging payload differences.
Still need help?
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