First App with Node

Create Folder and File

Create Folder

On Desktop, create a folder manually (e.g., NodeApp)

or

Open Terminal and run:

mkdir NodeApp
cd NodeApp


Open Folder in VS Code

Using VS Code directly

Open VS Code

Go to File > Open Folder

Select your NodeApp folder


Using Terminal

code .
This opens the current folder in VS Code (if code command is configured).


Create a JavaScript File

  1. Create a file named app.js
Node.js runs JavaScript files, so .js extension is required.


Write Some Basic Code

Basic Output

console.log(20 + 20); // Output: 40


Function Example

function fruit(item) {
console.log("Fruit name is " + item);
}
fruit("apple");


Variable Example

var a = 10;
var b = 20;

console.log(a + b); // Output: 30


Run Node.js Code

Steps:

  1. Open terminal
  2. Navigate to your project folder (if not already)
  3. Run:
node app.js


File System Example (Just to Show)

var fs = require("fs"); // Import file system module

fs.writeFileSync("anil.txt", "My name is Anil");

This creates a file anil.txt and writes the content inside it.


REPL (Read Eval Print Loop)

  1. Just type node in terminal to enter REPL mode
  2. Then type JS code line by line


> 2 + 2
4
> .exit