Over the years, dozens of Stephen King stories have been adapted for screens both large and small, usually with disappointing results.
Brian De Palma's Carrie and Stanley Kubrick's The Shining are rightly regarded as classic horror movies, even if King himself professes to hate the latter. The only other critically and financially successful films based on King's work have had non-horror subjects: coming-of-age drama Stand by Me, thriller Misery and prison drama The Shawshank Redemption.
As for TV adaptations, they range from the merely forgettable (hello, It) to the utterly execrable (yes, Trucks, I'm talking about you)The poor hit rate is because the truly effective elements of King's stories don't tend to translate very well to a visual medium.
As a writer he's a great world builder - it's the grounded, ordinary details that ensure you relate to the characters, and make the more fanciful story elements credibly terrifying.