NodeJS app deployed on heroku issue - not retrieving data from database - node.js

Question

I'm having an issue with my full-stack application, (MySQL-Express-React-NodeJS). I have deployed it to Heroku everything is working except the pages that are connected to get or post to ClearDB MySQL database! Any advises or hints on something that I might have forgot to do? I'm also using the ClearDB add-on from Heroku if that helps.
server.js:
const express = require("express");
const bodyParser = require("body-parser");
const cors = require("cors");
const app = express();
const http = require("http");
const server = http.createServer(app);
const connection = require("./app/Models/database");
// require user the route
const user = require("./app/routes/user");
// require the doctor route
const doctor = require("./app/routes/doctor");
// require the question route
const questions = require("./app/routes/questions.js");
// require the schedule route
const schedule = require("./app/routes/schedule");
const appointement = require("./app/routes/appointment");
const socket = require("socket.io");
const io = socket(server);
app.use(cors());
// set the port
const port = process.env.PORT || 5000;
// parse requests of content-type - application/json
app.use(bodyParser.json());
// parse requests of content-type - application/x-www-form-urlencoded
app.use(bodyParser.urlencoded({ extended: true }));
// define the user router
app.use("/users", user);
app.use("/doctor", doctor);
app.use("/questions", questions);
app.use("/schedule", schedule);
app.use("/appointment", appointement);
app.use(function (error, req, res, next) {
if (error instanceof SyntaxError) {
//Handle SyntaxError here.
return res.status(500).send({ data: "Invalid data" });
} else {
next();
}
});
const peers = {};
io.on("connection", (socket) => {
//
if (!peers[socket.id]) {
peers[socket.id] = socket.id;
}
socket.emit("yourID", socket.id); // allows you to emit custom events on the server and client
io.sockets.emit("allUsers", peers); //will send to all the clients ......socket.broadcast.emit will send the message to all the other clients except the newly created connection
socket.on("disconnect", () => {
delete peers[socket.id]; //after the user leave the room
});
socket.on("callUser", (data) => {
io.to(data.userToCall).emit("hello", {
signal: data.signalData,
from: data.from,
}); //io.to('some room').emit('some event');
});
socket.on("acceptCall", (data) => {
io.to(data.to).emit("callAccepted", data.signal);
});
});
//test route
app.get("/test", function (req, res) {
res.send( "test");
});
app.listen(port, () => {
console.log(`Server is Running on port ${port}`);
});
Heroku logs:
2021-01-04T18:46:17.729977+00:00 heroku[web.1]: Restarting
2021-01-04T18:46:17.732430+00:00 heroku[web.1]: State changed from up to starting
2021-01-04T18:46:18.729190+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2021-01-04T18:46:18.801647+00:00 heroku[web.1]: Process exited with status 143
2021-01-04T18:46:53.555253+00:00 heroku[web.1]: Starting process with command `npm start`
2021-01-04T18:46:57.234794+00:00 app[web.1]:
2021-01-04T18:46:57.234819+00:00 app[web.1]: > server#1.0.0 start
2021-01-04T18:46:57.234819+00:00 app[web.1]: > node server.js
2021-01-04T18:46:57.234820+00:00 app[web.1]:
2021-01-04T18:46:58.471423+00:00 app[web.1]: /app/server.js:61
2021-01-04T18:46:58.471444+00:00 app[web.1]: console.log(`Server is Running in port:${port}`);
2021-01-04T18:46:58.471446+00:00 app[web.1]: ^
2021-01-04T18:46:58.471446+00:00 app[web.1]:
2021-01-04T18:46:58.471447+00:00 app[web.1]: ReferenceError: port is not defined
2021-01-04T18:46:58.471447+00:00 app[web.1]: at Server.<anonymous> (/app/server.js:61:44)
2021-01-04T18:46:58.471447+00:00 app[web.1]: at Object.onceWrapper (node:events:482:28)
2021-01-04T18:46:58.471448+00:00 app[web.1]: at Server.emit (node:events:388:22)
2021-01-04T18:46:58.471448+00:00 app[web.1]: at emitListeningNT (node:net:1329:10)
2021-01-04T18:46:58.471449+00:00 app[web.1]: at processTicksAndRejections (node:internal/process/task_queues:79:21)
2021-01-04T18:46:58.502509+00:00 app[web.1]: npm ERR! code 1
2021-01-04T18:46:58.503140+00:00 app[web.1]: npm ERR! path /app
2021-01-04T18:46:58.509321+00:00 app[web.1]: npm ERR! command failed
2021-01-04T18:46:58.509747+00:00 app[web.1]: npm ERR! command sh -c node server.js
2021-01-04T18:46:58.536286+00:00 app[web.1]:
2021-01-04T18:46:58.542292+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-01-04T18:46:58.542507+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2021-01-04T18_46_58_510Z-debug.log
2021-01-04T18:46:58.614100+00:00 heroku[web.1]: Process exited with status 1
2021-01-04T18:46:58.673495+00:00 heroku[web.1]: State changed from starting to crashed
2021-01-04T18:46:58.677305+00:00 heroku[web.1]: State changed from crashed to starting
2021-01-04T18:47:24.050526+00:00 heroku[web.1]: Starting process with command `npm start`
2021-01-04T18:47:27.323089+00:00 app[web.1]:
2021-01-04T18:47:27.323103+00:00 app[web.1]: > server#1.0.0 start
2021-01-04T18:47:27.323103+00:00 app[web.1]: > node server.js
2021-01-04T18:47:27.323104+00:00 app[web.1]:
2021-01-04T18:47:27.950882+00:00 app[web.1]: /app/server.js:61
2021-01-04T18:47:27.950900+00:00 app[web.1]: console.log(`Server is Running in port:${port}`);
2021-01-04T18:47:27.950901+00:00 app[web.1]: ^
2021-01-04T18:47:27.950903+00:00 app[web.1]:
2021-01-04T18:47:27.950903+00:00 app[web.1]: ReferenceError: port is not defined
2021-01-04T18:47:27.950903+00:00 app[web.1]: at Server.<anonymous> (/app/server.js:61:44)
2021-01-04T18:47:27.950904+00:00 app[web.1]: at Object.onceWrapper (node:events:482:28)
2021-01-04T18:47:27.950904+00:00 app[web.1]: at Server.emit (node:events:388:22)
2021-01-04T18:47:27.950904+00:00 app[web.1]: at emitListeningNT (node:net:1329:10)
2021-01-04T18:47:27.950905+00:00 app[web.1]: at processTicksAndRejections (node:internal/process/task_queues:79:21)
2021-01-04T18:47:27.970852+00:00 app[web.1]: npm ERR! code 1
2021-01-04T18:47:27.971425+00:00 app[web.1]: npm ERR! path /app
2021-01-04T18:47:27.976210+00:00 app[web.1]: npm ERR! command failed
2021-01-04T18:47:27.976596+00:00 app[web.1]: npm ERR! command sh -c node server.js
2021-01-04T18:47:27.987341+00:00 app[web.1]:
2021-01-04T18:47:27.987620+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2021-01-04T18:47:27.987792+00:00 app[web.1]: npm ERR! /app/.npm/_logs/2021-01-04T18_47_27_977Z-debug.log
2021-01-04T18:47:28.067423+00:00 heroku[web.1]: Process exited with status 1
2021-01-04T18:47:28.111585+00:00 heroku[web.1]: State changed from starting to crashed
2021-01-04T18:48:09.000000+00:00 app[api]: Build started by user ishaqatfarah#gmail.com
2021-01-04T18:50:08.503349+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=speakout-2.herokuapp.com request_id=41eadebc-6547-4735-975c-47f07af41139 fwd="46.185.242.147" dyno= connect= service= status=503 bytes= protocol=https
2021-01-04T18:50:13.899678+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=speakout-2.herokuapp.com request_id=f9c641f9-30c1-4ef7-a184-0d286cecf4c0 fwd="46.185.242.147" dyno= connect= service= status=503 bytes= protocol=https
2021-01-04T18:50:37.722683+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=speakout-2.herokuapp.com request_id=a897151b-2c68-440d-bb39-877ad0e80b3c fwd="46.185.242.147" dyno= connect= service= status=503 bytes= protocol=https
2021-01-04T18:50:38.328012+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=speakout-2.herokuapp.com request_id=3b546e46-3812-4a18-8f78-f585c9f3e740 fwd="46.185.242.147" dyno= connect= service= status=503 bytes= protocol=https
2021-01-04T18:50:44.226260+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=speakout-2.herokuapp.com request_id=df1690f0-5e59-4105-aae7-857d2a2ef8ff fwd="46.185.242.147" dyno= connect= service= status=503 bytes= protocol=https
2021-01-04T18:50:44.682096+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=speakout-2.herokuapp.com request_id=d4bee131-4929-4f80-96dd-d829a6c53bde fwd="46.185.242.147" dyno= connect= service= status=503 bytes= protocol=https