Can a PUT request in REST API be considered idempotent without changing the resource state?

In REST API, the PUT method is considered idempotent, meaning that repeated calls to a PUT request with the same data should not change the resource's state after the first request. If a PUT request does not change the resource's state (for example, it is sent with the same data that is already stored), it can be considered safe to repeat in terms of idempotency.

However, it is important to understand that PUT idempotency does not guarantee the absence of side effects on the server (such as logging or counters), but from the perspective of the resource's state, repeated PUT should not lead to changes.

Example:

PUT /users/123
{
  "name": "Ivan",
  "email": "ivan@example.com"
}

If this request is sent multiple times with the same data, the user's state will not change after the first request.