Deploy SQL Server api with Express.js to Heroku - node.js

Question

I'm very new with Express.js, but right now i've created an api of SQL Server DB. It works fine on localhost, but now, i've deployed on Heroku. While my CMD prompt is open, my api works fine, but when it's close, i get an Internal Server Error.
Previously, i've created a test using Mongo as DB, mongoose and deployed to Heroku an the api still working even when the prompt isn't open. Someone knows if i have to create another .js document just like in mongoose or else to keep working my api?
This is my code on the .js document (server.js):
const express = require('express');
const bodyParser = require('body-parser');
const sql = require('mssql');
const app = express();
app.use(bodyParser.json());
app.use(function (req, res, next) {
res.header("Access-Control-Allow-Origin", "*");
res.header("Access-Control-Allow-Methods", "GET,HEAD,OPTIONS,POST,PUT");
res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, contentType,Content-Type, Accept, Authorization");
next();
});
const dbConfig = {
user: "daUser",
password: "daPass",
server: "daServer",
database: "DaDB"
}
const executeQuery = function (res, query) {
sql.connect(dbConfig, function (err) {
if (err) {
console.log(err);
res.send(err);
}
else {
// create Request object
var request = new sql.Request();
// query to the database
request.query(query, function (err, result) {
if (err) {
console.log(err);
res.send(err);
}
else {
res.send(result);
}
});
}
});
}
app.get("/api/HolidayBaseApi", function (req, res) {
var query = "SELECT * FROM [HolidaysBase]";
executeQuery(res, query);
})
const PORT = process.env.PORT || 8080
app.listen(PORT, () => {
console.log("App now running on port", PORT);
});
My package.json next:
{
"name": "holidaysbaseapi",
"version": "1.0.0",
"description": "Api of Holidays",
"main": "server.js",
"scripts": {
"start": "node server.js",
"test": "echo \"Error: no test specified\" && exit 1"
},
"author": "Chuck Villavicencio",
"license": "ISC",
"dependencies": {
"body-parser": "^1.18.3",
"express": "^4.16.4",
"mssql": "^4.3.0"
},
"engines": {
"node": "8.11.3",
"npm": "5.6.0"
}
}
On Heroku i've installed the Heroku CLI; logged in, Clone the repository and deployed my changes.
I'm using Express.js, Node, SQL Server and Heroku

Answer 1

The problem is that your SQL server db is created on you local machine and heroku can't connect to it. You can you the postgresDB provided by heroku or create the sql server db in any provider around the internet and replace the dbConfig with the configs of that db