Yes, there is a book version of Stranger Things. The book is titled Stranger Things: The Official Behind-The-Scenes Companion. It was written by Matt and Ross Duffer, with Greg Kripke. The book was published on October 17, 2017.
The book gives readers an in-depth look at the making of the show, from the idea to the execution. It includes interviews with the cast and crew, behind-the-scenes photos, and storyline details.