index.mjs

import http from 'http';
import fs from 'fs';
import path from 'path';

const CONTENT_TYPES = {
    '.js': 'text/javascript',
    '.css': 'text/css',
    '.png': 'image/png',
    '.jpg': 'image/png',
    '.gif': 'image/png',
};

function returnFileContent(filePath, contentType) {
    fs.readFile(filePath, (err, content) => {
        if (err) {
            if (err.code === 'ENOENT') {
                res.writeHead(404);
                res.end('File not found');
            } else {
                res.writeHead(500);
                res.end(`Server Error: ${err.code}`);
            }
        } else {
            res.writeHead(200, { 'Content-Type': contentType });
            res.end(content, 'utf-8');
        }
      });
}
const server = http.createServer((req, res) => {
    let filePath = '.' + req.url;
    if (filePath === './') {
        filePath = 'HomePage';
    }

    const extname = path.extname(filePath);
    let contentType = CONTENT_TYPES[extname] ?? 'text/html';

    if (contentType === 'text/html') {
      res.writeHead(200, { 'Content-Type': contentType });
      res.end('Hello World!', 'utf-8');
    } else {
        returnFileContent(filePath, contentType);
    }
});

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