Heroku + node.js error (Web process failed to bind to $PORT within 60 seconds of launch)

Question

I have my first node.js app (runs fine locally) - but I am unable to deploy it via heroku (first time w/ heroku as well). The code is below. SO doesn\'t let me write so much

Answer 1

From the heroku bash process, pass down the value of $PORT to your node app using an options parser like yargs.

Here is an example of how you might do that. On the scripts object, inside package.json, add a start method "node server --port $PORT".

In your server file, use yargs to get the value from the port option (--port $PORT) of the start method:

const argv = require('yargs').argv;
const app = require('express')();

const port = argv.port || 8081;

app.listen(argv.port, ()=>{
    console.log('Probably listening to heroku $PORT now ', argv.port); // unless $PORT is undefined, in which case you're listening to 8081.
});

Now when your app starts, it will bind to the dynamically set value of $PORT.