Is there anyway to detect OS language using javascript?

Question

I need to detect OS language using javascript so I can view my page depending on the language.

I know that we can detect the browser language but that is not enough

Answer 1

One thing for everyone here to consider, not all users know how to set their browser language preferences. So if you're making a site you WANT people to see, it's your problem if they land on it in a different language than one they're comfortable with, as it increases the change they will leave. A lot of it depends on the demographic you're targeting, but for a web page I think it's good to detect the system language IF you can at least, then then fall back on the browser language if you can't. It's more likely to be accurate.