Hi, my wife, 4 year old daughter and myself traveling from U. S. A. To Shanghai to Okinawa

Hi my family and I are traveling to Okinawa from the United States. We have a 19 and half hour layover in Shanghai on flight to Okinawa and a 2 and a half hour layover on way home. Would we need any special visa that we need to apply for or can we obtain everything once we land in Shanghai? We don't want to land and realize we needed to apply for something and it's to late. Thank you