Detect browser language and automatic switch it

[brunowego]

I'm try find a way to enable in i18Next the automatic switch language based on browser. Do you know how configure it? Thanks.

[zorgick]

You can do it on the server, when the initial request is made. You need to pass req.acceptsLanguage(/* variadic list of languages in descending order */) as a prop to IntlProvider. This will look for the accept-language header, that a browser sends automatically, and match each value from your list of languages in the arguments of acceptsLanguage function with possible values from the header. The first value to match is a winner. Then inside of the constructor (yes that thing with super() call) of IntlProvider you need to fire an action (it won't be an API request, just an object configuration, so it is ok to do it there), that will accept that prop with a matched language. Taking into consideration, that there could be no match or the language is not supported by your code base, you should have a supported languages array and search for the matched language in this array. If everything is ok then set the matched language as your app language via i18next.changeLanguage, if not, do the same with your default or favorite language) I hope, you'll make it))