JSON Diff & Compare

Find every difference between two JSON documents

A line-by-line text diff is noisy for JSON: re-indenting a file or reordering keys produces lots of “changes” that are not real. This tool compares the data. Both documents are parsed and walked together, and each difference is reported with a precise path:

• + added – the key or array item exists only in the modified document.
• − removed – it exists only in the original document.
• ~ changed – it exists in both, but the value or type is different.

Object keys are matched by name, so key order never matters. Array items are compared by position (index 0 with index 0, and so on), which is how most APIs and configuration files treat arrays.

How to compare JSON

1. Paste the original JSON into the top box and the new version into the bottom box (or upload files).
2. The differences appear immediately. Use the Text tab for a plain list you can paste into a ticket or pull-request comment.
3. Use Swap to reverse the direction of the comparison.

Example

{"version": "1.2.0", "replicas": 3}
{"version": "2.0.0", "replicas": 3, "region": "eu"}

~ version: "1.2.0" → "2.0.0"
+ region: "eu"

Typical uses

• Reviewing configuration changes before a deployment.
• Comparing API responses between staging and production.
• Checking what a migration script changed in exported records.
• Verifying snapshot or fixture updates in tests.