JSON Compare Diff
Compare two JSON objects side by side and highlight differences. Detect added, removed, and modified values instantly.
Difference Summary
Click "Compare" to see the differences between the two JSON objects.
About JSON Compare Diff
Our free online JSON Compare Diff tool is a powerful utility that helps you identify differences between two JSON objects or arrays. Whether you're debugging API responses, tracking configuration changes, or comparing data snapshots, this tool makes it easy to spot what has been added, removed, or modified.
The JSON Compare Diff tool performs a deep comparison of two JSON structures, recursively traversing nested objects and arrays to find every difference. Results are displayed with color-coded highlights: green for added properties, red for removed ones, and amber for modified values. This visual approach makes it easy to understand exactly what changed between your two JSON inputs.
The tool also includes smart comparison options such as ignoring array order (treating [1,2,3] and [3,2,1] as equal) and ignoring whitespace differences in string values. These options are particularly useful when comparing JSON from different sources that may have different formatting or serialization conventions.
All processing happens directly in your browser, so your JSON data never leaves your device. This ensures complete privacy and security for your sensitive data, including API keys, tokens, and confidential information.
Related JSON Tools
Features
Side-by-Side View
Compare two JSON objects in a split-pane layout for easy visual comparison.
Color-Coded Diffs
Added items in green, removed in red, and modified values in amber for instant recognition.
Deep Comparison
Recursively compare nested objects and arrays to find all differences at any depth level.
Ignore Array Order
Treat arrays with the same elements in different order as equal for more accurate comparisons.
Ignore Whitespace
Ignore leading/trailing whitespace and extra spaces in string values during comparison.
Diff-Only View
Filter to show only the differences, hiding unchanged properties for a cleaner view.
Statistics
View counts of added, removed, modified, and unchanged properties at a glance.
Swap Inputs
Quickly swap the left and right JSON inputs to compare in the opposite direction.
Privacy First
All comparison happens in your browser. Your data never leaves your device.
How to Use
Paste Original JSON
Paste the original or baseline JSON into the left editor pane. This represents the "before" state of your data.
Paste Modified JSON
Paste the modified or updated JSON into the right editor pane. This represents the "after" state you want to compare against.
Configure Options
Enable options like "Ignore array order" or "Ignore whitespace" to customize how the comparison is performed based on your needs.
View Differences
Click Compare to see a color-coded diff summary showing all added (green), removed (red), and modified (amber) properties.
Frequently Asked Questions
What does JSON Compare Diff do?
JSON Compare Diff performs a deep, structural comparison between two JSON objects or arrays. It recursively traverses both JSON structures and identifies every difference, including added properties, removed properties, and modified values. The results are displayed in a color-coded format that makes it easy to understand exactly what changed between the two inputs.
What does "Ignore array order" mean?
When this option is enabled, arrays are compared by their contents rather than their positions. For example, [1, 2, 3] and [3, 2, 1] would be considered equal. This is useful when the order of elements in your arrays doesn't matter and you want to focus on whether the same data is present in both versions.
What does "Ignore whitespace" do?
When enabled, string values are compared after trimming leading and trailing whitespace and collapsing multiple internal spaces into single spaces. This means "Hello World" and " Hello World " would be treated as equal. This option is helpful when comparing JSON from sources with inconsistent string formatting.
Is this JSON Compare Diff tool free?
Yes, it is completely free to use with no registration, sign-up, or limits. You can use it as many times as you need for personal, educational, or commercial projects without any restrictions.
Does it work offline?
Yes, once the page is loaded, all JSON comparison happens entirely in your browser using JavaScript. No server communication is needed, so you can use it even without an internet connection after the initial page load.
Can it compare large JSON files?
Yes, this tool can handle large JSON files efficiently. The deep comparison algorithm is optimized for performance, though very large files (several megabytes with deeply nested structures) may take a moment longer to compare. For typical API responses and configuration files, comparison is nearly instant.
Is my JSON data secure?
Absolutely. All JSON comparison happens directly in your browser using JavaScript. Your data is never sent to any server, stored, or logged. This ensures complete privacy and security for sensitive information like API responses, tokens, and configuration data.
What types of differences can it detect?
The tool detects four types of differences: Added (properties present in the right JSON but not in the left), Removed (properties present in the left JSON but not in the right), Modified (properties present in both but with different values), and Unchanged (properties with identical values in both). Each type is displayed with distinct color coding for easy identification.