The official express.js hello world example may crash on certain deployments that rely on a certain PORT.
Make sure you use the PORT set on process.env if it is set.
const PORT = process.env.PORT || 3000
Complete example (code):
const express = require('express')
const app = express()
const PORT = process.env.PORT || 3000
app.get('/', (req, res) => res.send('Hello World!'))
app.listen(PORT, () => console.log(`Example app listening on port ${PORT}!`))
Expert level: How to curl this into an index.js file
I’ve created a bit.ly link that links to the raw version of a file called “hello-world” in my repo “code”
How to: curl it and create an index.js file
curl -L https://bit.ly/express-hello-world > index.js
More about curl