If by “javascript” you mean a script placed on your website, you should be able to use common browser tools to request permission to get the user’s position, though i have never worked with that.
If you are receiving a http request via node.js, you should have their ip, which you could determine their location from, tho not accurately.
But other than that, you can always ask the user to manually input it, otherwise. Though in general you should be careful with using/collecting information about a user without their consent - some people dont like that.
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