Upvote:2
From the Ft Lauderdale airport website, JetBlue uses terminal 1, Concourse C. Ft Lauderdale is already a small airport, and JetBlue only uses part of one terminal so you will have plenty of time to transit.
But even that you are booking JetBlue all the way through, they should have already accounted for your transit time and believe that the connection is reasonable.
So don't worry about things and just enjoy Costa Rica.
What's weird to me is that I flew JetBlue to Ft Lauderdale several times last year and I would swear I never used Terminal 1