A structural JSON diff can ignore object-key order, but other differences need explicit rules. Should null equal a missing property? Does an array represent an ordered sequence or a set of records identified by id? Decide before comparing, especially for API regression tests.
Validate both inputs, reject duplicate keys if your parser permits them, and consider number representation such as 1 versus 1.0. Compare a small nested sample and inspect the exact paths that changed. If arrays are order-insensitive, match records by a stable unique key rather than sorting their rendered text. The JSON diff tool helps reveal changes, but the meaning of a change depends on your schema.
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