# MERN Shots | app.jsx vs app.js

### Ever wondered why the React entry point is named `app.js` instead of `app.jsx`?

Contrary to what you might think, the choice of extension is more of a convention than a limitation. While `.jsx` is the superhero in our React code, our entry point file stays cool with a `.js` cape.

JSX, the magic that makes our code look like HTML in JavaScript, undergoes a transformation before the browser executes it. Tools like Babel work behind the scenes, turning our `app.js` into a superhero ready to battle in the browser arena.

So, whether you're rocking `app.js` or `app.jsx`, fear not! It's all about conventions and personal flair. The world of React welcomes both with open arms.

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