JSON Diff
Paste JSON A and JSON B, then Compare. The report uses Added (in B only), Removed (in A only), Changed, and Unchanged, by node path.
JSON A
JSON B
Added Removed Changed Unchanged
| Status | Node | JSON A | JSON B |
|---|---|---|---|
| Run Compare to fill this table. | |||
About JSON Diff
This free online JSON diff tool compares JSON A against JSON B and reports every added, removed, changed, and unchanged value with clear color coding. Use it to review API contract changes, audit configuration drift between staging and production, or confirm that a data transform did only what you expected. Results are keyed by path so nested differences are easy to trace even in large documents.
JSON diff is the right choice when you care about the type of change, not only that two files are different. Added keys, deleted keys, and value changes are listed separately so a missing field does not look the same as a renamed one. Unchanged paths can stay visible when you want confidence that the rest of the payload was left alone. That makes it useful for migration scripts, serializer upgrades, and OpenAPI response checks.
Developers, SREs, and data engineers paste responses from logs, test runs, or two environments and read the diff in seconds. You do not need to write a script, install jq, or format the files first. Invalid JSON is rejected with a parse message so you fix the input before you trust the result.
All diffing runs in the browser with no upload. Sensitive production dumps and personally identifiable JSON never leave your machine. Use this free JSON diff checker whenever you need a path-level, color-coded view of what changed between two JSON documents.
Features
- Compare JSON A vs B: added, removed, changed, unchanged
- Paste text or load a file and get a result in one click
- Copy or download the output for your project
- Input for JSON Diff is processed in your browser
- No signup and no intentional server-side storage of tool input
How to use JSON Diff
- Paste text or load a file into JSON Diff.
- Choose the format, compare, validate, or convert action you need.
- Copy the result or download it for your project.
- Input is processed in your browser and is not uploaded for this tool.
Suggested next steps
- JSON Compare — Diff two JSON documents; matching and differing nodes listed by path
- JSON Beautify — Pretty-print JSON with 2, 3, or 4 space indent
- JSON Viewer — Inspect, format, and browse JSON
Frequently asked questions
Is JSON Diff free?
Yes. JSON Diff on Free Tool Mate is free to use in your browser. There is no paid unlock for the core tool features described on this page.
Does JSON Diff upload my data?
No. JSON Diff is designed to process your input locally in the browser. Free Tool Mate does not intentionally store tool input or uploaded files on the server.
Do I need an account to use JSON Diff?
No account is required. Open the page, use JSON Diff, and leave when you are done.
What can I use JSON Diff for?
JSON Diff covers Compare JSON A vs B: added, removed, changed, unchanged. It is built for quick, private work in the browser without installing desktop software.