JSON Diff

JSON Diff

Spotting what changed between two JSON documents by eye is painful once objects get large or deeply nested. This JSON diff tool compares two payloads and highlights every value that was added, removed, or changed, so you can review API changes, config updates, or test fixtures at a glance instead of scanning line by line.

How it works

The comparison runs locally in your browser. Paste your original JSON on one side and the updated version on the other, and the tool parses both and walks their keys and values on your machine, marking differences as it goes. It compares structure and values rather than raw text, so reordered keys and formatting changes don't create noise. No data is uploaded, and results update instantly.

Common use cases

• Review how an API response changed between two releases.
• Verify that a config edit only touched the fields you intended.
• Debug failing tests by diffing expected vs. actual JSON.
• Audit differences between environments like staging and production.

Format both sides first with the JSON Formatter for the cleanest comparison, or validate them with the JSON Validator. For plain-text comparisons, try the Text Diff Checker.

Private by design

Both JSON documents stay entirely in your browser. There's no upload, no sign-up, and no logging — the tool is free and works on every modern browser, including mobile. You can safely compare production data and internal payloads without any of it leaving your device.