Express "Hello World" — http://expressjs.com/en/starter/hello-world.html

app.js

require('express')()
  .get('/',  (req, res) => res.send('Hello World!'))
  .listen(3000, () => console.log(`Example app listening on port ${3000}!`));

package.json

{
  "name": "express-hello",
  "version": "1.0.0",
  "description": "Express hello-world",
  "main": "app.js",
  "scripts": {
    "test": "true"
  },
  "repository": {
    "type": "git",
    "url": "git+https://gist.github.com/8cdafeee8f74ddb757f9ca79063c1502.git"
  },
  "keywords": [
    "express",
    "hello",
    "world"
  ],
  "author": "Express",
  "license": "ISC",
  "bugs": {
    "url": "https://gist.github.com/8cdafeee8f74ddb757f9ca79063c1502"
  },
  "homepage": "https://gist.github.com/8cdafeee8f74ddb757f9ca79063c1502",
  "dependencies": {
    "express": "^4.15.2"
  }
}

Don't do that.