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Oh, okay, so we're shifting gears from client-side JavaScript to server-side. That makes sense, there's so much more you can do when you're not confined to the browser. It's good they're explicitly drawing that distinction right up front.

Setting up Node.js is the first hurdle, good to know there are specific instructions and even a separate video for that. And having a command-line terminal ready is crucial, that's where all the action will happen for server stuff.

So the `index.js` file is our entry point for server-side code, and running it with `node index.js` executes it line by line. That's a pretty straightforward way to test out server logic without a full-blown web server running yet.

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The module begins by differentiating between client-side JavaScript, which runs in the browser and was used in previous examples for displaying maps and data [0:00], and server-side JavaScript, which will be explored now. To achieve this, Node.js is introduced as the runtime environment for executing JavaScript outside the browser. The speaker guides viewers through installing Node.js and setting up a command-line terminal for interaction [0:30]. The foundational step of creating an `index.js` file to write server-side code is demonstrated, highlighting Node.js's ability to execute code line by line when run from the terminal [1:00].

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