How to Write Your First Node.js Program
Writing your first Node.js program is the first step. Here is how to do it, step by step.
How to Write Your First Node.js Program
Writing your first Node.js program is the first step to backend development. Here is how to do it.
Step 1: Install Node.js
Download and install Node.js LTS from the official website. Verify with node -v in your terminal. If it prints a version, you are ready.
Step 2: Create a File
Create a file called hello.js. In it, write console.log('Hello from Node.js'). Save it.
Step 3: Run It
In your terminal, run node hello.js. You should see 'Hello from Node.js' printed. That is your first Node.js program.
Step 4: Add Server-Side Code
Try requiring a built-in module: const os = require('os'); console.log(os.platform()). Run it. You just accessed system information from JavaScript, which is impossible in a browser.
Step 5: Build a Simple Server
Use the http module to build a basic server that responds with 'Hello World'. This is where Node.js starts to feel like real backend development.
Step 6: Understand What Happened
You ran JavaScript outside the browser, accessed the system, and built an HTTP server. This is what Node.js does. Everything else builds on these fundamentals.
The Takeaway
Write your first Node.js program by installing Node.js, creating a file, running it with node, adding server-side code with built-in modules, building a simple HTTP server, and understanding what you just did. This is the foundation.
Install Node.js LTS, create a file called hello.js with console.log('Hello from Node.js'), run it with node hello.js, then try requiring built-in modules like os to access system information. That is your first Node.js program.
Save your JavaScript in a file, like hello.js, then run node hello.js in your terminal. If Node.js is installed, it executes the file and prints any console output to the terminal.
Start with console.log to confirm it works. Then try requiring a built-in module like os or fs to access system information or the file system. This shows you what server-side JavaScript can do that browser JavaScript cannot.
Use the built-in http module: create a server with http.createServer that responds with 'Hello World', and listen on a port. This is the foundation of backend development with Node.js.
In Node.js, you can access the file system, network, and system information through built-in modules. In the browser, JavaScript is sandboxed. Running node hello.js gives JavaScript full system access, which is the key difference.
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Master Node.js
Want to upskill yourself, crack your next interview, and get your dream job? Join our comprehensive course.