what is the genre of it?
"chick lit" genre
The Devil Wears Prada (novel)
The novel is considered by many to be an example of the "chick lit" genre.

who was the devil wears prada based on A young woman who is hired as a personal assistant to a powerful fashion magazine editor. is the above name a kind of writing? A novel who is the author? Lauren Weisberger
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The Devil Wears Prada (novel) [SEP] Introduction
Before writing the novel, Weisberger had worked as a personal assistant for American "Vogue" editor Anna Wintour, much like the novel's protagonist works for a powerful fashion magazine editor, who also happens to be British like Wintour. Reviewers considered the book a "roman à clef", offering insider perspectives on Wintour and other "Vogue" staff. A sequel, "Revenge Wears Prada: The Devil Returns", was published in 2013.