"Emotion is everything," Fernandez said. "To repeat, a second title in a world championship is something not easy and these past months have been tough sometimes with some injuries and some pains.
"So to be able to perform today and perform good in front of everybody ... it was unbelievable.
"I’m so glad I think the people enjoyed it and that for me is the most important thing."
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Hanyu took silver with 295.17 points and Chinese teenager Jin Boyang won bronze on 270.99.
The Japanese was well below his best and posted just 184.61 in the free skate, falling and losing balance on other occasions.
Canadian Olympic silver medallist and Four Continents champion Patrick Chan settled for fifth place.
(Reporting by Ben Everill in Los Angeles, editing by Nick Mulvenney)
