Creating a server (module) in Node.js(module)

The purpose 

I will create an HTTP server using Node.js.

The implementation will use ESM (import) instead of CJS (require).

Environment

install Node.js

download and install Node.js from the link below, selecting the version appropriate for my environment.

Node.js — Download Node.js®

Node.js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts.

nodejs.org

Implementation

Create an arbitrary folder and create a file named server.mjs inside it with the following contents:

import http from 'node:http';

/////Start server, return json for a request
const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'application/json' });
  res.end(JSON.stringify({
    data: 'Hello World!',
  }));
});

server.listen(8000);///// use Port8000

Ececute

Open the command prompt and navigate to the folder where you created server.mjs.

Then, execute the following command.

node .\server.mjs

Operational check

 Accessing 127.0.0.1:8000 in a browser like Chrome returns JSON data.

The following returns the same result even if arbitrary characters are entered after 127.0.0.1:8000/; no 404 or other errors are returned.

Result

now running an HTTP server with Node.js.

Reference

HTTP | Node.js v25.1.0 Documentation

nodejs.org