Error while deploying react js and node app to aws - node.js

Question

I want to deploy my app to aws, i search and i found alot of tutorials i try each one and i get this error on the browser:
Cannot GET /
I figure maybe that my problem is from my nodeJS server code.
This is my server.js code hope you guys can help me thanks.
const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const passport = require('passport');
const path = require('path');
const cors = require('cors');
//Api routes
const users = require('./routes/api/usuario');
const alumno = require('./routes/api/alumno');
const personal = require('./routes/api/personal');
const zonas = require('./routes/api/zonas');
const sepomex = require('./routes/api/sepomex');
const app = express();
app.use(cors());
//Body parser middleware
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
//Db config
const db = process.env.NODE_ENV === "production" ? require('./config/keys').mongoURIProd : require('./config/keys').mongoURIDev;
//connect to mongo DB
mongoose
.connect(db, { useNewUrlParser: true })
.then(() => console.log('MongoDB Connected'))
.catch(err => console.log(err));
//passport middleware
app.use(passport.initialize());
//passport config
require('./config/passport')(passport);
//Use routes
app.use('/api/usuario', users);
app.use('/api/alumno', alumno);
app.use('/api/personal', personal);
app.use('/api/zonas', zonas);
app.use('/api/sepomex', sepomex);
//serve static assets to production
if (process.env.NODE_ENV === "production") {
//static folder
app.use(express.static("client/build"));
app.get('/*', (req, res) => {
res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'));
})
}
const port = process.env.PORT || 5000;
app.listen(port, () => {
console.log(`Server running on port ${port}`);
});
I have deployed my app on heroku and works fine.

Answer 1

If you are deploying to EC2 instance then you need to specify IP address in app.listen to be 0.0.0.0, by default it is set to localhost which is not what you want if you want the app to be reachable from outside.
You should change your code to
app.listen(port, '0.0.0.0', () => {
console.log(`Server running on port ${port}`);
});