JSON Diff

How to use JSON Diff

1. Open JSON Diff — it runs entirely in your browser with no setup.
2. Paste or type your input into the text area, or upload a file where supported.
3. Set any options you need. The result appears in the output panel — there is no upload step and no waiting on a server.
4. Review the output instantly; large inputs are handled locally without lag.
5. Copy the result to your clipboard or download it. Your data never leaves the page.

Why use JSON Diff?

• 100% free with no limits, no sign-up and no watermarks.
• Private by design — your data are processed in your browser and never uploaded to a server.
• Fast and lightweight, with instant results even on a phone or a slow connection.
• Works everywhere — any modern browser on Windows, macOS, Linux, Android or iOS.
• Part of a full developer tools suite, so related json diff tasks are one click away.

What people use JSON Diff for

• Finding what changed between two API responses when one works and the other does not.
• Comparing a config before and after a deployment.
• Reviewing a generated payload against a known-good fixture.

JSON Diff: limits and things worth knowing

• Comparison is structural, so reformatting and key reordering are correctly ignored — object key order is not significant in JSON.
• Array order is significant and is reported. An array whose items were merely shuffled will show as changed, because to JSON it is changed.
• Type changes are called out separately from value changes: the string "5" and the number 5 are different, and that difference causes a lot of real bugs.
• Both documents are parsed in your browser, which matters because production payloads are exactly the kind of thing people paste into diff tools.

Is it private and secure?

Your privacy is built in. JSON Diff runs completely on your device, so whatever you enter stays in your browser and is never transmitted, logged or stored on any server.

Network activity: none. Nothing is sent and nothing is fetched. This tool makes no network request at all once the page has loaded — which is why it keeps working if your connection drops.

You do not have to take that on trust — our privacy proof page publishes the Content-Security-Policy that enforces it, lists every third party it permits, and shows how to verify the whole claim yourself.

Learn more

Working with JSON, XML and YAML: Format, Validate and Convert — Messy config or API response? Learn to pretty-print, validate and convert between JSON, XML, YAML and CSV in seconds.