If you have a valid explanation for why you quit within a year, it shouldn't be a problem and it sounds like you do, "they want me to do .NET but I want to focus on JS which I was hired to do. Turbulence within company etc" Been in a similar situation and have been asked why I want to leave so soon and my reasons were fairly similar to yours. I'd like for that to be the exception though.
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If you have a valid explanation for why you quit within a year, it shouldn't be a problem and it sounds like you do, "they want me to do .NET but I want to focus on JS which I was hired to do. Turbulence within company etc" Been in a similar situation and have been asked why I want to leave so soon and my reasons were fairly similar to yours. I'd like for that to be the exception though.