Basic Express template

app.js

import express from "express";

const { APP_PORT } = process.env;

const appPort = parseInt(APP_PORT, 10) || 3000;
const app = express();

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.get("/", (request, response) => {
  response.send("OK");
});

app.use((error, request, response, next) => {
  response.send(
    getHeader(request, "ERROR") +
      `<p><strong>Error message:</strong></p>` +
      `<blockquote>${error.message}</blockquote>` +
      `<p><strong>URL params:</strong></p>` +
      `<pre>${JSON.stringify(request.query, null, 2)}</pre>` +
      getFooter()
  );
});

app.listen(appPort, () => {
  console.log(`App is running at http://localhost:${appPort}`);
});

package.json

{
  "name": "basic-express-template",
  "version": "0.1.0",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "dotenvx run -- nodemon app.js"
  },
  "type": "module",
  "license": "MIT",
  "devDependencies": {
    "@dotenvx/dotenvx": "^1.20.0",
    "nodemon": "^3.1.7"
  },
  "dependencies": {
    "express": "^4.21.1"
  }
}