The stronger the hand, the bigger the payouts. As always, when you play internet video poker, remember to check the individual machine's payout-table before you begin. A general rule of thumb is that the size of the payouts follows regular poker hand ranking.
Notable for Joker poker is that it's played with 53 card decks, all regular cards 2-A plus one joker, and therefore this is one of few games where you can actually get a five-of-a-kind hand. (You can also obtain five-of-a-kind hands in Deuces Wild video poker as all two's are wild and substitutes, just like the joker in Joker Poker, to any other card).
Notes on Joker Poker Payouts
The payout table usually starts at a pair of kings in Joker Poker. Deuces Wild, for example, starts at three-of-a-kind. This is because in Joker Poker there is only one wild card and therefore it's harder to create strong hands. Deuces Wild contains more wild cards (all four 2's) but you don't get paid for any pairs and the payouts for trips and straights are usually much lower as well.
If you compare with Jacks or better, the added wild card in Joker Poker increases the chances of being dealt a strong hand - unfortunately this is also reflected in the pay table.
Level-up Joker Poker
Sometimes, Joker Poker is offered in level-up mode. In level-up mode a made poker hand will take you to the next level. Each level multiplies your winnings; on the first level you win 1x your hands payout, second level 2X, et cetera. If you don't make your hand, the game is over and you will drop down the ladder. A "Free Ride Card" can automatically take you to the next level, even if your hand doesn't qualify.
The Screenshot above is taken from a Level-up Joker Poker game at All Slots Casino.