Start with valid JSON
Before comparing two payloads, validate each side. Invalid input can hide the real difference and make the comparison harder to trust.
What to review
Look for added keys, removed keys, changed values, changed arrays, and nested objects that moved location. For API work, review whether the change affects clients, documentation, tests, or storage.
Common mistakes
Do not compare only raw text when order is not meaningful. Also remember that a JSON diff does not know whether a changed value is safe or correct for your business workflow.
FAQ
Can object key order differ?
Yes. Some systems reorder keys, so focus on structure and values when key order is not important.
Can a diff prove compatibility?
No. It highlights differences, but compatibility still needs tests and schema review.