I am uploading a basic node application to aws elastic beanstalk and i am getting a 502 bad gateway response when I go to the environment

I uploaded the following file named server.js:

var express = require('express');
var app = express();

app.get('/', function (req, res) {
    console.log('Send message on get request');
    res.send('Hello full-stack development!');
});

app.set('port', process.env.port || 3000);

var server = app.listen(app.get('port'), function () {
    console.log('Express server listening on port:' + 
    server.address().port);
}); 

along with the following package.json file:

{
    "name": "newswatcher",
    "version": "0.0.0",
    "description": "NewsWatcher",
    "main": "server.js",
    "author": {
        "name": "myname",
        "email": "myemail"
    },
    "scripts": {
        "start": "node server.js"
    },
    "dependencies": {
        "express": "4.17.1"
    }
}

and the package-lock.json and the npm modules. I followed the basic steps to create an aws application and then upload and deploy the zip file with the four files I have mentioned in and have set the environment variable NPM_CONFIG_PRODUCTION to true. Then when I go to the environment I get the 502 bad gateway error.

It works fine when I run it locally with npm start.

This is from the logs which make it seems like it is working:

/var/log/web.stdout.log

Jan 10 01:46:27 ip-172-31-13-23 web: > newswatcher@0.0.0 start /var/app/current

Jan 10 01:46:27 ip-172-31-13-23 web: > node server.js

Jan 10 01:46:27 ip-172-31-13-23 web: Express server listening on port:3000

Jan 10 01:49:59 ip-172-31-13-23 web: > Elastic-Beanstalk-Sample-App@0.0.1 start /var/app/current

Jan 10 01:49:59 ip-172-31-13-23 web: > node app.js

Jan 10 01:49:59 ip-172-31-13-23 web: Server running at http://127.0.0.1:8080/

Jan 10 01:58:11 ip-172-31-13-23 web: > newswatcher@0.0.0 start /var/app/current

Jan 10 01:58:11 ip-172-31-13-23 web: > node server.js

Jan 10 01:58:11 ip-172-31-13-23 web: Express server listening on port:3000

This is from the error logs:

2021/01/10 02:24:23 [error] 4619#0: *431 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.24.137, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8080/", host: "172.31.13.23"

2021/01/10 02:24:23 [error] 4619#0: *433 connect() failed (111: Connection refused) while connecting to upstream, client: 172.31.10.27, server: , request: "GET / HTTP/1.1", upstream: "http://127.0.0.1:8080/", host: "172.31.13.23"

These go on and on like this.

What is wrong?