Pope Francis on the same day that it became known that Pope John Paul II was to be canonized so to was John XXIII. Now Pope John XXIII was never to be proven to have that elusive 2nd miracle but Pope Francis feels that his tenor as Pope is deserving of the honor.
It was John XXIII who opened the Vatican II council which brought about the modern Catholic Church. John XXIII was always believed to have collaborated with the Germans during WWII. Nothing has ever truly been proven on that . So yes Pope John XXIII is deserving on Sainthood as the man who turned the Catholic Church into what it is today.