JSON Echo Server in Node.js with no NPM installs

package.json

{
  "name": "json-echo-server",
  "version": "0.1.0",
  "description": "Echos the request payload as JSON",
  "main": "server.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "Sampath Sitinamaluwa",
  "license": "ISC"
}

server.js

const http = require("node:http");
const PORT = process.env.PORT || 8000;

const server = http.createServer((req, res) => {
    let raw = "";

    req.on('data', chunk => raw += chunk);
    req.on('end', () => {
        let json;
        let error;
    
        try {
            console.log(`Parsing: ${raw}`)
            json = JSON.parse(raw);
        } catch(e) {
            error = e.message;
        }
    
        res.writeHead(
            error ? 400 : 200,
            { 'Content-Type': 'application/json' }
        );
        res.end(JSON.stringify({ error, json, raw }));
    });
});

server.listen(PORT, () => {
    console.log(`HTTP Server listening on port ${PORT}`);
});