NodeJS - Create a server from core modules.

README.MD

Objective

Create a bare bones server using nodejs core modules and not expressjs.

Which core modules are used

1. http
2. url

Concepts

Create a server from http

const { Server } = require("http");
const app = new Server((req, res) => {
  res.writeHead(404);
  res.write("Cannot find "+req.url);
  res.end();
});

Use some mechanism to handle requests based on the req.url inside the server handler.

server.js

const { Server } = require("http");
const url = require('url');
function extractQueryParams(p) {
    const u = url.parse(p, true);
    return u.query;
}
const app = new Server((req, res) => {
    if (req.url.startsWith("/")) {
        const params = extractQueryParams(req.url);
        if (!params.name) {
            res.writeHead(200);
            res.write("Hello Anonymous!");
            res.end();
        } else {
            res.writeHead(200);
            res.write("Hello "+ params.name +"!");
            res.end();
        }
    } else {
        res.writeHead(404);
        res.write("Cannot get "+req.url);
        res.end();
    }
});
app.listen(4200, () => {
    console.log(`Server started on port 4200`);
});