Setting Up Express Application

mkdir my-api && cd my-api
npm init -y
npm install express
npm pkg set type="module"
node --watch app.js

import express from "express";

const app = express();
const port = process.env.PORT || 3000;

app.get("/", (req, res) => res.json({ status: "ok" }));

const server = app.listen(port, () =>
  console.log(`Listening on http://localhost:${port}`)
);

server.on("error", (err) => console.error("Server error:", err));

import path from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
app.set("views", path.join(__dirname, "views"));
app.set("views", [path.join(__dirname, "views"), path.join(__dirname, "shared")]);

app.disable("x-powered-by");
// or with helmet
import helmet from "helmet";
app.use(helmet());  // also removes X-Powered-By

app.use(express.static("public", {
  maxAge: "1y",
  immutable: true,
  etag: false,
  setHeaders: (res, filePath) => {
    if (filePath.endsWith(".html")) res.setHeader("Cache-Control", "no-cache");
  }
}));
app.use("/cdn", express.static("assets"));

app.locals.siteName = "Acme";
app.locals.year = new Date().getFullYear();
app.locals.formatDate = (d) => new Intl.DateTimeFormat("en-US").format(d);
// Available in every view as siteName, year, formatDate