JSON Diff Viewer

Compare two JSON documents and instantly see structural additions and removals, computed locally in your browser.

Original JSON

Changed JSON

Diff Result

2 additions, 1 removals

  {
    "active": true,
    "name": "Ada Lovelace",
-   "role": "Engineer"
+   "role": "Senior Engineer",
+   "team": "Core"
  }

Frequently Asked Questions

Is my data sent to a server when using the JSON Diff Viewer?

No. The JSON Diff Viewer is a fully client-side utility. All data processing, calculations, and conversions are handled locally in your browser. No input text, payloads, or keys are uploaded to any external server.

Does the JSON Diff Viewer do a raw text diff or a structural diff?

It parses both inputs as JSON and diffs their normalized, stably-stringified form, so it compares structure and values rather than raw text formatting. Both inputs must be valid, parseable JSON for the comparison to run.

What are common use cases for a JSON diff tool?

Comparing two versions of an API response to spot regressions, reviewing changes between two config files, or checking that a data transformation produced the expected output.

What happens if my JSON is invalid?

If either the original or changed input fails to parse as valid JSON, the tool shows a clear parsing error instead of attempting the comparison, so you can fix the syntax first.

Does the JSON Diff Viewer store history or cache my inputs?

No. The application runs entirely in browser memory. Once you refresh the tab, navigate away, or close the window, all inputted details, logs, and outputs are completely cleared.

Is the JSON Diff Viewer compatible with mobile devices?

Yes. The interface is optimized to be fully responsive. You can perform calculations, conversions, and formats on all modern mobile, tablet, and desktop web browsers.

Does the JSON Diff Viewer work offline?

Yes. Once loaded, all code and assets required to run the JSON Diff Viewer reside in your browser cache, enabling offline use without an active network connection.