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Free, private, and runs entirely in your browser. No data is sent to any server.
Paste JSON into both panels to see differences...
A JSON diff checker compares two JSON documents and highlights the differences between them — added keys, removed keys, and changed values. Unlike plain text diff tools, a JSON-aware diff understands the structure of the data. It knows that key order does not matter in JSON objects, that {"a":1,"b":2} and {"b":2,"a":1} are semantically identical, and that differences should be reported at the key/value level rather than the line level. This structural awareness makes JSON diff tools far more useful than generic text comparison for debugging API changes, reviewing config updates, or verifying data migrations.
Paste the first JSON document into the left editor and the second into the right editor. The diff checker parses both documents, normalises key ordering, and compares them recursively. Differences are highlighted in the output: additions (keys present in the second but not the first) are shown in green, deletions (keys present in the first but not the second) in red, and modifications (same key, different value) in yellow. The comparison runs instantly in your browser — both documents stay private on your device.
API version migration: compare responses from v1 and v2 of an endpoint to identify schema changes. Configuration auditing: diff production and staging configs to verify differences before deployment. Data pipeline debugging: compare input and output JSON to trace where data is lost or transformed unexpectedly. Test assertions: compare expected and actual JSON in test reports to understand failures. Database migration: compare JSON exports before and after a schema migration. In all these cases, a structural diff that understands JSON semantics is dramatically more useful than a line-by-line text diff.
A textual diff (like Unix diff) compares files line by line. Reordering keys, changing indentation, or switching between compact and beautified formatting all produce noise in a text diff even though the data is identical. A structural JSON diff first parses both inputs into data structures, then walks them recursively to find actual semantic differences. This means {"name":"Alice","age":30} and {"age":30,"name":"Alice"} produce zero differences in a structural diff but would show as completely different lines in a text diff. Our tool performs structural comparison, so you only see real data changes.