"I am excited and over the moon. It is a huge honour for both myself personally and I am really proud to represent Wales as well," said Jones, who will have Peter Allan of Scotland and France's Jerome Garces as his assistant referees.
"This is probably the biggest match of my career and now with the new IRB refereeing structure, I think it is a huge stepping stone in my career that will hopefully lead to bigger and better things
"There are a lot of good referees in this tournament. We have just had our debrief regarding the tournament and it has been said it is probably one of the best, if not the best group of referees to officiate a tournament like this."
Jones was quick to call home with news of his appointment, admitting: "First phone call was to Dad, and being a former referee himself he was over the moon, very excited, likewise my mum. Then I called my wife and son, they are all chuffed to bits."
For Paddy O'Brien, the IRB Referee Manager, the Junior World Championship final - which kicks off at 15:00 local time (07:00 UK time, 18:00 New Zealand time) - is in safe hands.
"James has enjoyed a very good tournament and is ranked near the top of the referees performing here. He is a very experienced official having refereed Magners League and European Cup fixtures so the final is in safe hands."