I just got a Windows 8 PC and installed Visual Studio 2013 Pro and Visual Studio 2013 Express. Unfortunately I am not able to create Javascript projects to develop apps for
I had the same problem on a machine that only had Visual Studio 2013 Express for Windows (not desktop) installed. Going to Control Panel, Add/Remove Programs and running a repair on VS fixed it - the New Project dialog now lists JavaScript Store App templates.
Possibly I should mark my question as a dup and redirect here?