JSON Diff & Compare Tool
Compare two JSON objects side-by-side and visualize differences with color-coded highlighting. Perfect for debugging API changes, comparing configurations, and reviewing data transformations.
How to Use This Tool
Paste your first JSON object in the "Original" input box and your second JSON object in the "Modified" input box. The tool automatically compares the two JSON structures and highlights the differences in real-time.
Use the "Side-by-Side" view to see both JSON objects with their differences aligned, or switch to "Unified" view for a single, merged view similar to Git diffs. Green highlights show added fields, red shows removed fields, and yellow shows modified values.
All comparison happens in your browser – your JSON data never leaves your device. Perfect for comparing API responses, configuration files, or any JSON data structures.
Common Use Cases
JSON diff tools are essential for debugging API changes between versions, comparing development and production configurations, reviewing data transformations, and understanding what changed in API responses.
Developers use JSON comparison to track schema changes, verify data migrations, compare webhook payloads, and debug unexpected API behavior. It's also useful for code reviews when configuration files are updated.
Use this tool when investigating "what changed" between two API responses, comparing before/after states in testing, or documenting API version differences for migration guides. For more developer tools, explore その他の開発者ツールについては、SmartSummarizeをご覧ください。
Why Use Our JSON Diff Tool?
Visual Diff
Color-coded highlighting makes it easy to spot additions (green), deletions (red), and modifications (yellow) at a glance.
Two View Modes
Choose between side-by-side comparison or unified diff view, depending on your preference and screen size.
Diff Statistics
Get instant statistics showing the number of added, removed, modified, and unchanged fields in your comparison.
Frequently Asked Questions
What does the JSON Diff tool show me?
The diff tool compares two JSON objects and highlights differences in four categories: Added fields (green, only in JSON 2), Removed fields (red, only in JSON 1), Modified fields (yellow, different values in both), and Unchanged fields (gray, same in both). It provides visual side-by-side or unified diff views with detailed statistics.
What's the difference between side-by-side and unified view?
Side-by-side view displays both JSON objects next to each other with color-coded differences, making it easy to see the original and changed values simultaneously. Unified view shows a single merged view with diff markers (+ for added, - for removed, ~ for modified), similar to Git diffs, which is more compact and familiar to developers.
Can I compare deeply nested JSON structures?
Yes! The diff tool handles deeply nested JSON objects and arrays of any complexity. It recursively compares all levels of nesting and shows exactly which nested fields changed, were added, or were removed. This is perfect for comparing API responses, configuration files, or database documents with complex structures.
Is my JSON data safe when using this tool?
Yes, absolutely. All JSON comparison happens entirely in your browser using JavaScript. Your data never leaves your device or gets sent to any server. This means you can safely compare sensitive API responses, configuration files, or confidential data without privacy concerns.
What are common use cases for JSON Diff?
Developers use JSON Diff to compare API response versions, verify configuration changes before deployment, review database document modifications, debug API integration issues, validate data transformations, track changes in JSON exports, and audit data migrations. It's essential for quality assurance and troubleshooting.
Do I need to sign up or pay to use this tool?
No, this tool is completely free to use with no signup required. There are no usage limits, no file size restrictions, and no hidden costs. We believe developer tools should be accessible to everyone without barriers.