talking cats that snuck out at night

[a]

all i remember was that there were these cats that could talk and no one knew, and they would sneak out at night and meet up at a fence
i remember the cover was mostly purple and it was a kids book
providing character names could help

[SamSpayedPI]

Jenny and the Cat Club: A Collection of Favorite Stories about Jenny Linsky?

There are several collections of "The Cat Club" stories, but most have yellow covers.