change how APP_URL is used, use JS templating string

index.js

@@ -1,4 +1,5 @@
 require("dotenv").config();
+const { APP_PORT } = require("./app/config/appConfig");
 
 const welcome = require("./app/controllers/welcome").getWelcome;
 const {
@@ -50,8 +51,6 @@ const app = express();
 app.use(bodyParser.json());
 app.use(bodyParser.urlencoded({ extended: true }));
 
-const port = process.env.PORT || 5000;
-
 app.set("views", path.join(__dirname, "/app/views"));
 app.set("view engine", "ejs");
 app.use(layout());
@@ -182,7 +181,9 @@ app.get("/redirect/:id", redirect);
 
 app.use("/assets", express.static("./app/public"));
 
-app.listen(port, () => console.log(`Example app listening on port ${port}!`));
+app.listen(APP_PORT, () =>
+  console.log(`Example app listening on port ${APP_PORT}!`)
+);
 
 var rule = new schedule.RecurrenceRule();
 rule.seccond = 1;