What is a JSON Diff Tool?

A JSON diff tool compares two JSON documents and highlights the differences between them. JSONKit's diff tool offers side-by-side and inline views powered by Monaco Editor's diff engine, with color-coded additions, deletions, and modifications. Perfect for debugging API responses, config changes, or data migrations.

How to use

1. Paste the original JSON into the left panel.
2. Paste the modified JSON into the right panel.
3. Differences are highlighted immediately: added lines, removed lines and changed values are marked in different colors.
4. Switch between split view and inline view, and edit either side directly to see the diff update.

Features

• Side-by-side and inline diff views.
• Line-level and character-level highlighting of changes.
• Edit both documents in place with full syntax highlighting.
• Useful for comparing API responses, configuration versions and test fixtures.
• Both documents stay in your browser; nothing is uploaded.

Frequently asked questions

Does the order of keys matter when comparing?

The diff compares the text of the two documents, so reordered keys show up as changes. For the cleanest comparison, format both sides the same way first, for example with the JSON Beautifier.

Can I compare two API responses?

Yes. Copy each response into one side of the editor. This is a quick way to see what changed between two environments, two API versions, or before and after a code change.

Is it safe to compare confidential data?

Yes. The comparison runs entirely in your browser, and neither document is sent to a server.