The original form of the expression meaning that which is deserved is just deserts. Some modern English speakers, however, may prefer the non-standard form which is just desserts.
Here's a list of synonyms for just deserts.
Justice delivered in a retributive manner
“Just watch this get published and then those guys will get their just deserts.”
A sentence or punishment imposed, such as by a judge, court, tribunal or deity
Justice delivered in a retributive manner
(now literary) A reward, prize or recompense for a service
The consequence of an action, irrespective of good or bad
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