如何将连接到Postgresql的Node.js应用程序部署到Heroku

Question

我正在部署一个将postgresql数据库连接到heroku的应用程序nodeJS，但我不知道该怎么做。

index.js-通过端口8888连接到数据库

var express = require('express');
var app = express();
app.use(express.static("public"));
app.set('view engine', 'ejs');
app.set("views", "./views");
app.listen(process.env.PORT || 3000);


var pg = require('pg');
var config = {
  user: 'postgres',
  database: 'book',
  password: 'hovupham0311',
  host: 'localhost',
  port: '8888',
  max: 10,
  idleTimeoutMillis: 30000,
}


var pool = new pg.Pool(config);

app.get("/",function(req,res){

    pool.connect(function(err, client, done) {
        if (err) throw err
        client.query('SELECT * FROM sach', function(err, result) {
          done();
          if (err) {
              res.end();
            return console.error(err);
          } 
          res.render("home",{data:result});
        });
      });

})

这是package.json文件

{
  "name": "demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "node index.js"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.19.0",
    "ejs": "^2.7.1",
    "express": "^4.17.1",
    "multer": "^1.4.2",
    "pg": "^7.12.1"
  }
}

，一切都可以在本地主机上运行。有人可以帮我吗！