Today some of my colleagues were trying to integrate csslint into the build process of a project using the nodejs package but they kept hitting an issue: npm ERR! Unsupported npm ERR! Not compatible with your operating system or architecture: firstname.lastname@example.org npm ERR! Valid OS: darwin,linux npm ERR! Valid Arch: any npm ERR! Actual OS: win32 npm ERR! Actual Arch: ia32 So I had a crack on my machine and it worked just fine.