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Understanding when to use "use server"

In&Out posted this in #help-forum
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Hey folks, do I need to put "use server" on the file that is fetching some info from an API?
The API is just using cookies to pass as headers. Or to be precise, when exactly should I use "use server"?

2 Replies

European sprat
It's used only in server action functions or at the top of a file that has multiple server actions