server.js

const http = require('http');
const fs = require('fs');
const path = require('path');

const server = http.createServer((req, res) => {
    let filePath = '.' + req.url;
    if (filePath === './') {
        filePath = './index.html';
    }

    const extname = path.extname(filePath);
    const contentType = {
        '.html': 'text/html',
        '.js': 'text/javascript',
        '.css': 'text/css',
        '.json': 'application/json',
        '.png': 'image/png',
        '.jpg': 'image/jpg',
        '.gif': 'image/gif',
    }[extname] || 'text/plain';

    fs.readFile(filePath, (error, content) => {
        if (error) {
            if(error.code === 'ENOENT') {
                res.writeHead(404);
                res.end('File not found');
            } else {
                res.writeHead(500);
                res.end('Server error: ' + error.code);
            }
        } else {
            res.writeHead(200, { 'Content-Type': contentType });
            res.end(content, 'utf-8');
        }
    });
});

const port = 3000;
server.listen(port, () => {
    console.log(`Server running at http://localhost:${port}/`);
});