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JSON Diff Tool

Compare two JSON documents and see exactly what changed between them: which keys were added, which were removed and which values differ. Eyeballing two large JSON blobs to spot a single altered field is slow and error-prone, and this tool does the structural comparison for you. It walks both objects recursively, reports each difference with its full key path, and shows the old and new values side by side so a config drift or an unexpected API change is immediately obvious. It parses and validates both inputs first, so malformed JSON is caught before diffing. Paste the two versions and click compare. All comparison happens in your browser, so sensitive payloads are never uploaded.

How to use JSON Diff

  1. Paste the original JSON on one side.
  2. Paste the changed JSON on the other.
  3. Read the added, removed and changed keys.

Frequently asked questions

How does the JSON diff compare objects?

It parses both inputs and compares them key by key, reporting which keys were added, removed or changed along with their old and new values.

Does it compare nested structures?

Yes. It walks into nested objects so differences deep in the structure are surfaced, not just top-level keys.

What if one side is invalid JSON?

Both inputs must parse as valid JSON; if one does not, you get a parse error instead of a diff.

What is JSON Diff?

Compare two JSON documents and see exactly what changed between them: which keys were added, which were removed and which values differ. Eyeballing two large JSON blobs to spot a single altered field is slow and error-prone, and this tool does the structural comparison for you.

Is JSON Diff free to use?

Yes. JSON Diff is completely free, with no sign-up and no usage limits.

Does JSON Diff work in a web browser?

Yes. JSON Diff runs in any modern web browser. There is nothing to download or install.

Is my data private with JSON Diff?

Yes. JSON Diff runs entirely on your device in your browser, so nothing you enter is uploaded to a server.

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