Free JSON compare / JSON diff online. Paste two JSON objects, swap or format either side, and see added, removed, and changed keys instantly.
Structural JSON diff runs entirely in your browser. Nested keys use dot paths; array items use indexes like items[0]. Nothing is uploaded for comparison.
Quick start
Free online JSON compare and JSON diff tool for developers. Paste two JSON objects side by side, format or swap either side, then get a clear path-by-path diff: added keys, removed keys, and changed values — including nested objects and array indexes. Hide unchanged rows, read a quick summary of what moved, and debug API responses, configs, or migrations without leaving the browser. Your JSON never uploads to a server. Pair it with the JSON Formatter, JSON to YAML converter, and JSON Schema Generator. No signup required.
Text diffs care about whitespace and line order. A structural JSON diff compares values by path, so reordering keys or pretty-printing does not invent fake changes. That makes this free JSON compare tool ideal when you need a fast JSON diff online for API bodies, configs, or exported records — without installing a desktop app or uploading secrets to a third-party server.
For a longer walkthrough of techniques and pitfalls, read How to Compare Two JSON Objects Online. To pretty-print a single payload first, use the JSON Formatter.
Diff staging vs production payloads, or before/after a code change, without eyeballing huge objects.
Catch drift in package.json, tsconfig, feature flags, or infra JSON before a release.
Compare a source record to the migrated copy and confirm every nested field landed correctly.
See which keys appeared, disappeared, or changed between two webhook deliveries.
Drop any valid JSON on each side. Use Load Example to see nested object and array paths in action.
Format Both (or either side) to pretty-print input. Swap flips A ↔ B when you want the opposite baseline.
Read the summary chips first, then the path table. Green = added, red = removed, yellow = changed.
On large objects, toggle Hide unchanged so only real differences stay visible.
| Status | Meaning | What to check |
|---|---|---|
| Added | Path exists only in JSON B | Confirm the new field is intentional. |
| Removed | Path exists only in JSON A | Check whether a deletion or rename broke consumers. |
| Changed | Same path, different value | Verify the new value (type, nullability, enums). |
| Unchanged | Same path and value on both sides | Safe to ignore; hide them when reviewing. |
Nested objects become paths like user.address.city. Array items use indexes like items[0].id. The summary counts are a checklist helper — not a claim about product quality or ranking.
Beautify or minify a single JSON payload before you diff it.
Convert configs either way when one side of the change is YAML.
Turn a sample object into a draft schema after you lock the shape.
Generate interfaces from JSON once the diff confirms the final shape.
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