How are changes categorized in the results?

Differences are grouped into four buckets—added, removed, updated, and unchanged properties—so you can quickly see exactly what moved between the two documents.

What is the difference between side-by-side and unified views?

Side-by-side places the two JSON objects in parallel columns for visual scanning, while the unified view interleaves changes into a single stream similar to a git diff.

JSON Diff - Online JSON Compare Tool & Validator

Compare two JSON files online and see the differences highlighted. Visualize changes, spot errors, and validate structure with secure client-side diff.

JSON 1

JSON 2

View Mode:

How to Use JSON Compare & Diff Checker

Paste your first JSON object in the left textarea

Paste your second JSON object in the right textarea

Click 'Compare JSON' to see the differences highlighted

Review added, removed, updated, and unchanged properties

Key Features

Deep Comparison

Recursively compares nested objects and arrays to find all differences

Multiple View Modes

Switch between side-by-side and unified diff views for better readability

Detailed Results

Categorizes changes into added, removed, updated, and unchanged properties

FAQ

Does it handle nested objects and arrays?

Yes, it recursively compares all nested structures to find deep differences

Is my data secure?

All processing happens locally in your browser - no data is sent to servers

What formats are supported for download?

Results can be downloaded as formatted text files for easy sharing and documentation

Paste two JSON objects and this tool instantly highlights their differences—listing added, removed, updated, and unchanged properties. It recursively walks nested objects and arrays for a deep diff, supports side-by-side and unified views, and runs entirely in your browser so no data is uploaded to a server.

How to Use the JSON Compare & Diff Checker

1
Paste your first JSON
Enter the original or baseline JSON object into the left textarea. Use the Format button to clean up indentation if needed.
2
Paste your second JSON
Enter the JSON you want to compare against into the right textarea—both inputs are required before comparing.
3
Click "Compare JSON"
The tool recursively diffs both objects and highlights every change across nested structures and arrays.
4
Review the results
Inspect added, removed, updated, and unchanged properties, and switch between side-by-side and unified diff views.
5
Copy or download
Copy the comparison to your clipboard or download it as a formatted text file for sharing and documentation.

References

RFC 8259 — JSON
The IETF specification defining the JSON data interchange format that both compared documents must conform to.
RFC 6902 — JSON Patch
Defines a standard JSON document format for expressing a sequence of changes (add, remove, replace) between two JSON values.

Related Tools

JSON Formatter

Beautify and validate each JSON object before comparing them.

Text Compare & Diff

Compare two plain-text blocks line by line instead of by structure.

JSON to XML

Convert your JSON documents into XML for systems that require it.

YAML to JSON

Convert YAML files to JSON so you can diff them with this tool.

Frequently Asked Questions

Does it handle nested objects and arrays?: Yes, it recursively compares all nested structures to find deep differences.
Is my data secure?: All processing happens locally in your browser - no data is sent to servers.
What formats are supported for download?: Results can be downloaded as formatted text files for easy sharing and documentation.
How are changes categorized in the results?: Differences are grouped into four buckets—added, removed, updated, and unchanged properties—so you can quickly see exactly what moved between the two documents.
What is the difference between side-by-side and unified views?: Side-by-side places the two JSON objects in parallel columns for visual scanning, while the unified view interleaves changes into a single stream similar to a git diff.