JSON Diff - Free Online JSON Comparison Tool
Compare two JSON documents side-by-side. Visualize added, removed, and modified values with color-coded highlights.
JSON Diff Tool
Compare two JSON structures and visualize the differences with color-coded highlights. Added values appear in green, removed values in red, and modified values in amber.
- Paste two JSON documents to compare
- See exactly what changed at each path
- Works with nested objects and arrays
- Get a summary count of all changes
- Copy a detailed diff report
About JSON Diff
Compare two JSON documents side-by-side. Visualize added, removed, and modified values with color-coded highlights. JSON Diff is a free online tool by NeXiilo — no sign-up required, and everything runs privately in your browser.
Whether you use it daily for work or occasionally for a quick task, JSON Diff gives you fast, accurate results without uploading your data anywhere.
How to Use JSON Diff
- Open the JSON Diff above — paste or enter your input.
- Adjust any options to match what you need.
- Get instant results right in your browser.
- Copy or reuse the output wherever you need it.
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Frequently Asked Questions
What is JSON diffing?
JSON diffing is the process of comparing two JSON documents to identify what changed between them. It shows added, removed, and modified values at each path in the structure.
How does the diff visualization work?
The tool displays a side-by-side view with color-coded highlights: green for added values, red for removed values, and amber for modified values. Each change is shown with its full path.
Does it work with nested structures?
Yes, the diff algorithm recursively walks nested objects and arrays, tracking the exact path of each change (e.g., users[0].email or config.database.host).
Can I get a summary of changes?
Yes, the tool shows summary statistics with counts of added, removed, modified, and unchanged values. You can also copy a detailed diff report.
Is my JSON data stored anywhere?
No, all diffing happens in your browser. Your data is never uploaded to any server, ensuring complete privacy and security.