Node.js Basics with TypeScript

Initialize a Node TS project

mkdir ts‑node && cd $_
npm init -y
npm i -D typescript @types/node
npx tsc --init

Modify tsconfig.json to target CommonJS.

"module": "CommonJS",
"outDir": "dist",

Simple HTTP server with http

import http from 'http';

const server = http.createServer((req, res) => {
  res.writeHead(200, { 'Content-Type': 'text/plain' });
  res.end('Hello from TypeScript Node!');
});

server.listen(3000, () => console.log('🟢 listening on 3000'));

Run with npx ts-node src/server.ts or compile with tsc then node dist/server.js.

Using process.env with typings

const PORT = Number(process.env.PORT ?? 3000);