Simple node echo http server

node-http-echo.js

// FIXME this leaks memory for some reason

const http = require('http');
const port = parseInt(process.argv[2]);

const server = http.createServer((req, res) => {
	res.setHeader('Content-Type', 'application/json');
	res.write(stringify(req));
	res.end();
});

server.listen(port, err => {
	if (err) {
		throw err;
	} else {
		console.log(`Echo chamber is listening on ${port}`);
	}
});

function stringify(data) { // https://stackoverflow.com/questions/11616630/how-can-i-print-a-circular-structure-in-a-json-like-format
	const cache = [];
	return JSON.stringify(data, (key, value) => {
		if (typeof value === 'object' && value !== null) {
			if (cache.indexOf(value) !== -1) {
				return '[Circular]';
			}
			cache.push(value);
		}
		return value;
	});
}