deno_hello_world.ts

import { serve } from "https://deno.land/std/http/server.ts";
const s = serve({ port: 3000 });
for await (const req of s) {
    req.respond({ body: JSON.stringify({body: "Hello World" })});
}

node_hello_world.js

const http = require('http');

var server = http.createServer(function(request, response) {
    response.writeHead(200, {"Content-Type": "application/json"});
    response.end(JSON.stringify({body: "Hello world"}));
});

server.listen(3000);