Bare-bones HTTP server in Node.js - No 'http' or 'express' used

server.js

const net = require('net');
const fs = require('fs');
const os = require('os');
const path = require('path');
const process = require('process');

const PORT = 8888;
const LOGS_PATH = path.join(os.tmpdir(), 'server.log');

const server = net.createServer((socket) => {
  socket.on('data', (data) => {
    const _ = parseRequest(data.toString());

    const response = createResponse('Hello, World!');
    socket.write(response);
  });
});

server.listen(PORT, () => {
  console.log(`Server listening on port ${PORT} - logs stored under ${LOGS_PATH}`);
});

function logRequest(data) {
  const log = `${(new Date()).toUTCString()} - ${data.method} ${data.path}`;
  fs.access(process.cwd(), fs.constants.W_OK, function(err) {
    if (err) {
      console.error("[W] Cannot write logs in current path!");
    } else {
      if (!fs.existsSync(LOGS_PATH)) {
        fs.writeFileSync(LOGS_PATH, '');
      }
      fs.appendFileSync(LOGS_PATH, log + '\n');
      for (const idx in data) {
        fs.appendFileSync(LOGS_PATH, `${idx}: ${data[idx]}\n`);
      }
      fs.appendFileSync(LOGS_PATH, '\n');
    }
  });
  console.log('[I]', log)
}

function parseRequest(data) {
  const splitData = data.split(/[\r\n]/g).filter((idx) => idx.length > 0);
  const firstLine = splitData[0].split(/\s/g);
  const queryPath = firstLine[1].split('?', 2);
  const res = {
    method: firstLine[0],
    path: queryPath[0],
    query: queryPath[1] ||''
  }
  splitData.shift();
  for (const idx in splitData) {
    const dataLine = splitData[idx].split(/\:\s/);
    res[`${dataLine[0]}`] = dataLine[1];
  }
  logRequest(res);
  return res;
}

function createResponse(body) {
  return `HTTP/1.1 200 OK
Content-Type: text/plain
Content-Length: ${body.length}

${body}`;
}