It depends... Sometimes the Joker is completely helpless and is weak but in other cases he is has equal strength to Batman or sometimes even more! In the end: You'd have to go by the majority of times Joker's beaten Batman in a fight.
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The only weaknesses that the Joker has is his own insecurities about Batman and his powers. Other than that there is no known weaknesses for the Joker.
The Joker does not have any kind of powers, thus he has the strength of a normal person. However, he is a skilled fighter and proficient in the use of multiple types of guns.
Given that Batman survives and, ultimately, the Joker does not, being just another villain, one can assume that Batman is stronger.
In "The Batman" animated TV show, Joker disguises himself as Batman in the "The Laughing Bat" episode.
Who is Batman? that is what the card says.
batman
In the original edition of the Batman comic, the very first book ever released contained the Joker. The Joker was the first villain that Batman ever defeated.
They call him BAT