Client-side vs Server-side JavaScript

Feature	Client-side JavaScript	Server-side JavaScript
Execution	Browser	Server/runtime
Main purpose	UI interaction, DOM manipulation, validation	Business logic, APIs, database access
DOM access	Yes, normally	Not to the user's browser DOM
Visibility	Code is generally delivered to the client	Server implementation can remain private
Example	Browser JavaScript	Node.js

Client-side example

document.getElementById('msg').textContent = 'Hello';

Server-side example

// Node.js
const http = require('http');
http.createServer((req, res) => {
  res.end('Hello from server');
}).listen(3000);

Conclusion: Client-side JavaScript mainly controls behavior in the browser, whereas server-side JavaScript executes on the server to process requests and data.