NodeJS : Handler POST body using native http createServer

server.js

const http = require("http");
const { parse } = require("querystring");
const hostname = "0.0.0.0";
const port = 3000;

const server = http.createServer((req, res) => {
  if (req.method === "POST") {
    let body = "";
    req.on("data", (chunk) => {
      // convert Buffer to string
      body += chunk.toString(); 
    });
    req.on("end", () => {
      console.log(parse(body));
      res.setHeader("Content-Type", "application/json");
      res.end(JSON.stringify({ data: parse(body) }));
    });
  } else {
    res.end("Require POST request");
  }
});

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

https://www.digitalocean.com/community/tutorials/how-to-improve-website-performance-using-gzip-and-nginx-on-ubuntu-20-04