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Website still shows up when I shut down the server in AWS, Nodejs Express

I'm using React-ecommerce, nodejs and express. I'm using an EC2-Instance on AWS. So, when I go to ghostnft.tech, it says "Hello World", when my server is working. Even if the server is running on port 8080 and I don't open ghostnft.tech:8080. I don't know why this is happening but it works, so it's good. The problem is, when I shut down the server, it still says "Hello World" on the website. How can that be? And even now after two days the server is shut down, it still works. And when I update the server so it should say "Hello World!", it doesn't update on the website. Plus, when I first started the server and connected everything on AWS, when I go to the public IPv4-DNS address, but then with "ec2-2.32.example.aws.amazon.com:8080", it gave me from 2 out of 3 refreshes a "502 Bad Gateway". On ghostnft.tech it gave me everytime the 502. Then, after about 3 hours there wasn't any 502 on ghostnft.tech and it worked. What happened here?
Below you see my index.js, that is like the server.js.
const express = require('express');
const cors = require('cors');
require('dotenv').config({ path: './.env' });
const createCheckoutSession = require('./api//checkout');
const webhook = require('./api/webhook');
const app = express();
const port = 8080;
const server = app.listen(port, () => console.log('server listening on port', port));
server.keepAliveTimeout = 65000;
server.headersTimeout = 70000;
app.use(express.json({
verify: (req, res, buffer) => req['rawBody'] = buffer,
}));
app.use(cors({ origin: true }));
app.use(cors(corsOptions)) // Use this after the variable declaration
app.get('/', (req, res) => res.send('Hello World!!!'));
app.post('/create-checkout-session', createCheckoutSession);
app.post('/webhook', webhook);
And because of the 502 I tried this, but the website won't update:
const express = require('express');
const cors = require('cors');
require('dotenv').config({ path: './.env' });
const createCheckoutSession = require('./api//checkout');
const webhook = require('./api/webhook');
const app = express();
const port = 8080;
const server = app.listen(port, () => console.log('server listening on port', port));
server.keepAliveTimeout = 65000;
server.headersTimeout = 70000;
app.use(express.json({
verify: (req, res, buffer) => req['rawBody'] = buffer,
}));
const corsOptions = {
origin:'*',
credentials:true, //access-control-allow-credentials:true
optionSuccessStatus:200,
}
app.use(cors(corsOptions)) // Use this after the variable declaration
app.get('/', (req, res) => res.send('Hello World!!!'));
app.post('/create-checkout-session', createCheckoutSession);
app.post('/webhook', webhook);

Serve Vue,.js Pages with Express post with parameters

I've an web application that can render sites embeded. The problem is that this site only send POST requests.
So i thought about serving it using express, then i searched a little here i got the following code to serve it, listening to all GET requests as vuetify pages:
const express = require('express');
const path = require('path');
const hostname = 'localhost';
const port = 3000;
const app = express();
app.use(express.static(path.join(__dirname, 'dist')));
app.get('*', (req, res) => {
res.sendFile(__dirname, '/dist/index.html');
});
app.listen(port, hostname, () => {
console.log("Listening at http://%s:%s/", hostname, port);
});
Then I thought to add a post method to, receiving the parameters the page sends:
const express = require('express');
const path = require('path');
const hostname = 'localhost';
const port = 3000;
const app = express();
app.use(express.static(path.join(__dirname, 'dist')));
app.get('*', (req, res) => {
res.sendFile(__dirname, '/dist/index.html');
});
app.get('*', (req, res) => {
res.sendFile(__dirname, '/dist/index.html');
});
app.post('/data', (req, res) => {
const id = req.body.id;
res.sendFile(__dirname, '/dist/index.html');
});
app.listen(port, hostname, () => {
console.log("Listening at http://%s:%s/", hostname, port);
});
How do i pass this argument to vue?
Is this the best way to serve vue with a post request?

You are only sending the index.html file, there are other important files generated by vue.js.
In the following file I have a working middleware to serve a vue application which is built in ../../../frontend/dist/.
https://github.com/marekvospel/libregifts/blob/next/apps/backend/src/router/index.ts
The only important thing is the 2 middleware functions. You can replace the '/api' condition with a method check.
if (req.originalUrl.startsWith('/api')) next()

How am I supposed to use app.METHOD in Node.js?

so I'm trying to make a simple "route system", that would handle requests and send them to a certain controller.
The problem is that I can't even handle any route, because I get
Cannot GET /
error in response.
app.js
const express = require('express')
const router = require('./routes/routes')
const app = express()
const port = 3000
app.engine('.html', require('ejs').__express)
app.set('view engine', 'html')
router.load()
app.listen(port, () => {
console.log(`Waiting on :${port}`)
})
routes.js
const express = require('express')
const app = express()
// Route config
const routes = {
['/']: {
controller: 'index',
method: 'get'
},
}
// Load routes
const load = () => {
for (const route in routes) {
app[routes[route].method](route, (req, res) => {
// Do something
})
}
}
exports.load = load

You don't use your router file in app.js, try that:
app.js
const express = require('express')
const router = require('./routes/routes')
const app = express()
const port = 3000
app.engine('.html', require('ejs').__express)
app.set('view engine', 'html')
app.use('/', router);
router.load()
app.listen(port, () => {
console.log(`Waiting on :${port}`)
})
routes.js
var express = require('express');
var router = express.Router();
router.get('/', function(req, res, next) { res.send({ success: true }); });
module.exports = router;
It's useless and unreadeable create an array whit your all your routes.
My suggestion is to try use command by terminal express my_app for generate the base structure and try to use it or at least read for see how it's work.

You seem to be lacking the context for how the routing system works within Express.
As a starting point, please create a project with the below structure, and try creating your own route to ensure you have a grasp on how to utilize them properly.
Create a new project folder
cd into the project folder from within your terminal
run npm init -y
Run npm i express dotenv
Create a file named app.js in the root of your project folder and place the below code inside of it:
require('dotenv').config();
const express = require('express');
const app = express();
app.use(express.json({limit: '30mb', extended: true}));
app.use(express.urlencoded({ extended: true }));
app.listen(process.env.PORT || 3000, () => {console.log('Server successfully started')});
app.get('/', (req, res) => {
return res.send('Hello, World!');
});
Create a new folder named routes
Create a new file named test.js and place it inside of the routes folder
Place the below code in the test.js file.
const router = require('express').Router();
router.get('/', (req, res) => {
return res.send('Hello from your custom route!');
});
module.exports = router;
Go back into your app.js file and add the below lines of code to the bottom of the file
const testRoute = require('./routes/test');
app.use('/test', testRoute);
In your terminal, run node app.js
Make a GET request to http://localhost:3000/test by navigating to it with your browser, or by using a REST client, such as Postman.
Once you have completed these steps, you should understand the basic concept of Express routing.
You can use the router combined with Express Middleware to re-route your user to the proper controller based on the endpoint they are trying to access / the data they are trying to send.

Please test with this code
const express = require('express')
const app = express();
app.get('/', (req, res) => {
res.json({"message": "Welcome! it's working"});
});
The complete code is here on Github

Node.js and Express relationship

I'm trying to understand the connection between Node.js and Express.
My Code for creating a Node.js Server:
const https = require('https');
const fs = require('fs');
const options = {
key: fs.readFileSync('./https1/key.pem'),
cert: fs.readFileSync('./https1/cert.pem')
};
const server = https.createServer(options, function(req,res){
res.writeHead(200);
res.end(`Hello world!!!!!!!!!!! \n`);
});
server.listen(3000, function(){
console.log('Server listening on port 3000 \n');
});
I run a curl operation curl -k localhost:3000 and it gives me a "Hello World" Output
My code for creating an Express Server:
// call the packages we need
var express = require('express');
var app = express();
var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());
var port = process.env.PORT || 8080;
// ROUTES FOR OUR API
var router = express.Router();
// test route to make sure everything is working (accessed at GET http://localhost:8080/api)
router.get('/', function(req, res) {
res.json({ message: 'hooray! welcome to our api!' });
});
app.listen(port);
console.log('Magic happens on port ' + port);
Is it possible for us to mix both of these?
To be more specific, I would like to create my Server using the Node.js way, but create my routes using the Express way. Can I do it or should I just follow one methodology? What is the connection between Node.js and Express? I understand that Express is just a framework for Node.js but where exactly does the deviation occurs if at all any?
Can I mix and combine the two when required?
Thank you

Yes you can combine nodejs and express, but not encourage you to combine those unless you have specific purpose such as using AWS lambda or making specific OS tasks that has to be made only with pure node.
As you already know, express is just a framework. You can write code more shortly using express.
For example, to make the browser displaying Hello world,
// nodejs version
const http = require('http');
const hostname = '127.0.0.1';
const port = 3000;
const server = http.createServer((req, res) => {
res.statusCode = 200;
res.setHeader('Content-Type', 'text/plain');
res.end('Hello World!\n');
});
server.listen(port, hostname, () => {
console.log(`Server running at http://${hostname}:${port}/`);
});
// express version
const express = require('express');
const app = express();
const port = 3000;
app.listen(port, (req, res) => {
res.send('Hello World!\n');
})
More easier, and intuitive.

You surely can that's the way to create a Secure HTTPS server with express and followed in most projects
const https = require('https');
const express = require('express');
const app = express();
const options = {
key: fs.readFileSync('./https1/key.pem'),
cert: fs.readFileSync('./https1/cert.pem')
};
const server = https.createServer(options, app);
app.get('/', (req, res) => {
res.send('hello world')
}
server.listen(config.port, () => {
console.log(`Express server listening on port ${port} in ${app.get('env')} mode`);
});
Now add your routes and all.

Express Post Request 404

I'll try to make this as to the point as possible. I am trying to make a post request to my express backend. All of the post requests here work, except for "/addpayment". Here is my file called 'router.js'
module.exports = function(app) {
app.post('/signin', requireSignin, Authentication.signin)
app.post('/signup', Authentication.signup)
app.post('/addpayment', function(req, res, next) {
res.send({ message: 'why................' })
})
}
Here is my main 'server.js' file
const express = require('express')
const http = require('http')
const bodyParser = require('body-parser')
const morgan = require('morgan')
const app = express()
const router = require('./router')
const mongoose = require('mongoose')
const cors = require('cors')
// DB Connect
mongoose.connect('mongodb://localhost/demo-app')
// App
app.use(morgan('combined'))
app.use(cors())
app.use(bodyParser.json({ type: '*/*' }))
router(app)
// Server
const port = process.env.PORT || 3090
const server = http.createServer(app)
server.listen(port)
console.log('Server has been started, and is listening on port: ' + port)
I get a 404 in postman, and inside my app browser console. I am using passport in my other routes. I already tried running it through passport when I have a JWT token, and same thing(a 404).
I have already looked at all Stack Overflow/Github posts on the first few pages of google results, with no solution for my use case.

I have made a simplified version of your server and everything works as expected. Only difference that I have made is that I am not creating http server like you, but just calling app.listen
here is working example
router.js
module.exports = function(app) {
app.post('/addpayment', function(req, res, next) {
res.send({message: 'why................'})
})
};
server.js
var express = require('express');
var router = require('./router');
var app = express();
router(app);
//init server
app.listen(3000, function() {
console.log("Server running on port 3000");
});