# package.json
{
  "name": "nodejs-example",
  "version": "1.0.0",
  "description": "Node.js Example for Heroku",
  "main": "server.js",
  "scripts": {
    "start": "node server.js",
    "dev": "nodemon server.js"
  },
  "dependencies": {
    "express": "^4.18.2"
  },
  "engines": {
    "node": "18.x"
  }
}

# server.js
const express = require('express');
const app = express();
const port = process.env.PORT || 3000;

app.get('/', (req, res) => {
  res.send('Hello from Heroku!');
});

app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

# Initialize Git repository (if not already done)
git init
git add .
git commit -m "Initial commit"

# Create Heroku app
heroku create nodejs-example-app

# Deploy to Heroku
git push heroku main

# Scale to 1 web dyno (default)
heroku ps:scale web=1

# Open the app in browser
heroku open

# app.py
from flask import Flask
import os

app = Flask(__name__)

@app.route('/')
def home():
    return 'Hello from Flask on Heroku!'

if __name__ == '__main__':
    port = int(os.environ.get('PORT', 5000))
    app.run(host='0.0.0.0', port=port)

# requirements.txt
flask==2.2.3
gunicorn==20.1.0

# Procfile
web: gunicorn app:app

# Create a virtual environment (local development)
python -m venv venv
source venv/bin/activate  # On Windows: venv\Scripts\activate

# Install dependencies
pip install flask gunicorn

# Generate requirements.txt
pip freeze > requirements.txt

# Initialize Git and commit
git init
git add .
git commit -m "Initial commit"

# Create Heroku app
heroku create flask-example-app

# Deploy to Heroku
git push heroku main

# Open the app
heroku open

my-fullstack-app/
├── client/             # React frontend
│   ├── public/
│   ├── src/
│   ├── package.json
│   └── ...
├── server/             # Node.js backend
│   ├── server.js
│   └── ...
├── package.json        # Root package.json
└── ...

{
  "name": "fullstack-example",
  "version": "1.0.0",
  "engines": {
    "node": "18.x"
  },
  "scripts": {
    "start": "node server/server.js",
    "build": "cd client && npm install && npm run build",
    "dev": "concurrently \"npm run server\" \"npm run client\"",
    "server": "nodemon server/server.js",
    "client": "cd client && npm start",
    "heroku-postbuild": "NPM_CONFIG_PRODUCTION=false npm install --prefix client && npm run build --prefix client"
  },
  "dependencies": {
    "express": "^4.18.2"
  },
  "devDependencies": {
    "concurrently": "^7.6.0",
    "nodemon": "^2.0.21"
  }
}

// server/server.js
const express = require('express');
const path = require('path');

const app = express();
const port = process.env.PORT || 5000;

// API routes
app.get('/api/hello', (req, res) => {
  res.json({ message: 'Hello from the backend!' });
});

// Serve static assets in production
if (process.env.NODE_ENV === 'production') {
  // Set static folder
  app.use(express.static(path.join(__dirname, '../client/build')));

  // Any route that's not an API route will be handled by the React app
  app.get('*', (req, res) => {
    res.sendFile(path.resolve(__dirname, '../client/build', 'index.html'));
  });
}

app.listen(port, () => {
  console.log(`Server running on port ${port}`);
});

# Initialize Git repository
git init
git add .
git commit -m "Initial commit"

# Create Heroku app
heroku create fullstack-example-app

# Set environment variables
heroku config:set NODE_ENV=production

# Deploy to Heroku
git push heroku main

# Open the app
heroku open

# Add PostgreSQL add-on
heroku addons:create heroku-postgresql:hobby-dev

# Check the database URL
heroku config:get DATABASE_URL

# Connect to the database
heroku pg:psql

// db.js
const { Sequelize } = require('sequelize');

// Extract database configuration from DATABASE_URL
const databaseUrl = process.env.DATABASE_URL || 'postgres://localhost:5432/local_db';

// Configure SSL for Heroku PostgreSQL
const sequelize = new Sequelize(databaseUrl, {
  dialect: 'postgres',
  dialectOptions: {
    ssl: {
      require: true,
      rejectUnauthorized: false // Required for Heroku PostgreSQL
    }
  }
});

// Test the connection
async function testConnection() {
  try {
    await sequelize.authenticate();
    console.log('Database connection has been established successfully.');
  } catch (error) {
    console.error('Unable to connect to the database:', error);
  }
}

testConnection();

module.exports = sequelize;

# Run migrations on Heroku
heroku run npx sequelize-cli db:migrate

# Seed the database
heroku run npx sequelize-cli db:seed:all