Is JSON Diff Viewer free?

Yes, it is completely free to use, and no registration is required. Tool processing happens entirely in your browser, and your input content and uploaded files are not sent to a server. Our first-party improvement metrics use no cookies, visitor IDs, or session IDs and store only normalized page paths and daily counts for fixed event IDs.

JSON Diff Viewer

Compare JSON objects with color-coded diffs, filter by path, and export as JSON Patch for API automation

左側 JSON（変更前）

右側 JSON（変更後）

About JSON Diff Viewer

JSON Diff Viewer is an online tool that performs deep comparison of two JSON data structures and displays all differences in a clear, organized list with color-coded indicators. Simply paste JSON into the left and right text areas to see added keys (green), removed keys (red), and changed values (yellow) instantly highlighted.

Nested objects and arrays are compared recursively with diff paths shown in dot notation, allowing you to quickly locate changes even in large JSON documents. Search by path name and filter by diff type (added, removed, changed) to focus on relevant modifications, making it easy to navigate complex changes.

Perfect for comparing API responses across versions, tracking configuration file changes, validating test data, and more. Supports exporting diffs as JSON Patch (RFC 6902) for seamless API automation and data synchronization workflows. All processing happens in-browser with no data sent to any server.

How to use JSON Diff Viewer

Paste the original JSON into the left textarea and the modified JSON into the right textarea.
Click the Compare button to instantly see color-highlighted differences in the results table.
Use the path search box to find specific keys, filter by diff type, and export results as JSON Patch for API automation.

Benefits of JSON Diff Viewer

Identify additions, removals, and changes instantly with color coding. Dot notation paths pinpoint changes in large JSON documents
Search by path and filter by type (added/removed/changed) to focus on relevant diffs. Hide unwanted changes with ease
Export as JSON Patch (RFC 6902) for API automation and data synchronization. All processing in-browser ensures data privacy