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I am trying to deploy an Express/React/Mongo app to Heroku for the first time.

It is failing with a 503 error. The logs states the following:

Error R10 (Boot timeout) -> Web process failed to bind to $PORT within
60 seconds of launch

I have set the following port variable in the root index.js file:

const port = process.env.PORT || 3000;

and use it here:

app.listen(port, function()
 console.log("Express server is running on port " + port)
) 

It outputs "Express server is running on port 3000", which suggest that it is not picking up the Environmental variable.

I have been trying to follow instructions here: https://coursework.vschool.io/deploying-mern-with-heroku/

The key part that I am may be misunderstanding:

With Heroku, you need to set the environment variables on your newly
created Heroku app so it knows which values to use when the project is
deployed. You can do this two ways, either online on Heroku's website,
or through the command line using the heroku CLI. Since we are not
creating a new Heroku remote repository, all environment variables
will need to be added using Heroku.com.

I took this to mean that I should set an environmental variable Heroku.com, which I believe I have done so:

What am I failing to grok?

EDIT: I have tried setting theprocess.env.PORT=8000 from the Heroku CLI:

heroku config:set process.env.PORT=8000

But get the following error:

» Error: Missing required flag: » -a, --app APP app to run
command against » See more help with --help

Here is the full index.js:

const express = require('express'),
 cors = require('cors'),
 app = express(),
 port = process.env.PORT || 3000;
 bodyParser = require('body-parser'),
 todoRoutes = require('./routes/todo'),
 path = require("path");


app.use(bodyParser.json());
app.use(bodyParser.urlencoded(extended: true));
app.use(cors());
app.use(express.static(path.join(__dirname, "client", "build")))

app.get('/', function (req, res)
 res.send('Root route')
)

app.use('/api/todos', todoRoutes);

app.get("*", (req, res) => 
 res.sendFile(path.join(__dirname, "client", "build", "index.html"));
);

app.listen(port, function()
 console.log("Express server is running on port " + port)
)

I had local dev server running whilst deploying to Heroku. Tried redeploying after stopping dev server, and it worked. Local servers interfered with environment variables in deployment.