Was the apostle John the beloved disciple of Jesusthe writer of Revelation?

NO. The real revelations of the Apostle John about the end times were concealed, to be revealed directly in the 21st century. The ones in The Bible are false. Neither God, nor Jesus, nor the Apostle John would have entrusted such revelations to humanity in those times because no religious group has been mature enough in the last 2000 years to have such information. The Christians have been completely deceived.