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Free JSON Diff Checker — Compare JSON Files Online
Compare two JSON objects side-by-side and find differences.
About JSON Diff
Paste two JSON objects and instantly see what's different — added keys in green, removed keys in red, modified values highlighted. Ideal for comparing API response changes between versions, checking configuration drift between environments (dev vs. prod), verifying database migration outputs, or reviewing changes to JSON-based config files in pull requests.
How to Use JSON Diff
- 1Paste the original JSON in the left panel and the modified JSON in the right
- 2Differences are highlighted: green for added, red for removed, yellow for changed values
- 3Nested objects are compared recursively — changes at any depth are detected
- 4Copy the diff summary or export as a report
When to Use JSON Diff
- ▸Comparing API responses before and after an update
- ▸Reviewing configuration changes between environments
- ▸Detecting unexpected data mutations in state management
- ▸Auditing JSON data migrations
Frequently Asked Questions
- How deep does the comparison go?
- The diff recursively compares all nested objects and arrays, detecting changes at any depth. Array order matters — differently ordered arrays are flagged even if they contain the same elements.
- Can I ignore specific fields?
- The current version compares all fields. For selective comparison, pre-process your JSON (e.g., delete timestamp or metadata fields) before pasting.