Ultimate React Native Course example - how did it work without .jsx?

Hi all, I found the Ultimate React Native course very helpful (i am half way through Part 1). I just have a little confusion to clear.

In App.js, we are using xml -like tags to reference react-native components. Didn’t that need to be saved as .jsx file to leverage those tags feature? How did it work in .js format?

I wonder if .jsx is even necessary in my future projects

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did you have any trouble fetching data with the node server? Specifically, the listingScreen?