Is there any visa/other requirement to transit to another country

I will depart Atlanta, GA, on 21 May, and arrive in Shanghai (PVG) on 22 May. I will arrive at 7:10 PM. From there I will depart at 9:15 PM and arrive in Beijng (PEK) at 11:50 PM on the same day. At 2:15 AM on 23 May (which is 2 hours and 25 minutes from arrival at PEK), I will catch a flight going to Kuala Lampur. My question is this: Do I need to do anything special (visa wise) upon arrival in PVG or PEK? Or can I just transit through the airport to catch my next flight without any problems? Thank you in advance for your response.