Q1. How do you create and run your first Node.js program?
Create a file named app.js (or any name) and write:
console.log("Hello, Node.js!");Q2. How do you run a Node.js file with arguments?
You can pass arguments when running a Node.js script: node app.js arg1 arg2. Inside the script, access them via process.argv array. process.argv[0] is the node executable path, process.argv[1] is the script path, and subsequent elements are the arguments. Example:
console.log(process.argv[2])Q3. What is the difference between running JavaScript in browser vs Node.js?
In browser, JavaScript has access to DOM, window object, and browser APIs. In Node.js, there's no DOM; instead, you have access to server-side features like file system, networking, and process object. Both use the V8 engine, but the runtime environment and available APIs differ significantly.
Q4. How do you use global objects in Node.js?
Node.js provides global objects like __dirname (current directory), __filename (current file path), process (process information), and module (module information). You can use them without requiring any modules. For example:
console.log(__dirname)Q5. How do you create a simple HTTP server as your first program?
Use the built-in http module:
const http = require('http'); const server = http.createServer((req, res) => { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello World'); }); server.listen(3000, () => console.log('Server running'));