Node static server handler

server.js

const http = require('http'),
      staticServerHandler = require('./staticServerHandler'),
      port = 8080

let server = http.createServer(staticServerHandler)

server.listen(port)

console.log('Static server listening on port ' + port)

staticServerHandler.js

const fs = require('fs'),
      url = require('url'),
      path = require('path'),
      staticServerHandler = (req, res) => {
        // parse URL
        const parsedUrl = url.parse(req.url)
        // extract URL path
        let pathname = `.${parsedUrl.pathname}`

        // based on the URL path, extract the file extention. e.g. .js, .doc, ...
        let ext = path.parse(pathname).ext

        // maps file extention to MIME type
        const map = {
            '.ico': 'image/x-icon',
            '.html': 'text/html',
            '.js': 'text/javascript',
            '.json': 'application/json',
            '.css': 'text/css',
            '.png': 'image/png',
            '.jpg': 'image/jpeg',
            '.wav': 'audio/wav',
            '.mp3': 'audio/mpeg',
            '.svg': 'image/svg+xml',
            '.pdf': 'application/pdf',
            '.doc': 'application/msword'
        }

        if (ext === '') {
            pathname += '/index.html'
            ext = '.html'
        }

        // read file from file system
        fs.readFile(pathname, (err, data) => {
            if (err) {
                if (err.code === "ENOENT") {
                    // if the file is not found, return 404
                    res.statusCode = 404
                    res.end(`File ${pathname} not found!`)
                } else {
                    res.statusCode = 500
                    res.end(`Error 500: ${err}.`)
                }
            } else {
                // if the file is found, set Content-type and send data
                res.setHeader('Content-type', map[ext] || 'text/plain' )
                res.end(data)
            }
        })
    }

module.exports = staticServerHandler