Node.js and express.js

I am learning node.js, mongodb and [login to view URL] I have one github code of MVC pattern of node.js and currently i am facing issue of routes and [login to view URL] [login to view URL] code const express = require("express"); const cors = require("cors"); const app = express(); var corsOptions = { origin: "http://localhost:8081" }; [login to view URL](cors(corsOptions)); // parse requests of content-type - application/json [login to view URL]([login to view URL]()); // parse requests of content-type - application/x-www-form-urlencoded [login to view URL]([login to view URL]({ extended: true })); const db = require("./app/models"); [login to view URL] .connect([login to view URL], { useNewUrlParser: true, useUnifiedTopology: true }) .then(() => { [login to view URL]("Connected to the database!"); }) .catch(err => { [login to view URL]("Cannot connect to the database!", err); [login to view URL](); }); // simple route [login to view URL]("/go", (req, res) => { [login to view URL]({ message: "Welcome to bezkoder application." }); }); require("./app/routes/[login to view URL]")(app); // set port, listen for requests const PORT = [login to view URL] || 8081; [login to view URL](PORT, () => { [login to view URL](`Server is running on port ${PORT}.`); }); [login to view URL] code [login to view URL] = app => { const tutorials = require("../controllers/[login to view URL]"); var router = require("express").Router(); // Create a new Tutorial [login to view URL]("/", [login to view URL]); // Retrieve all Tutorials [login to view URL]("/", [login to view URL]); // Retrieve all published Tutorials [login to view URL]("/published", [login to view URL]); // Retrieve a single Tutorial with id [login to view URL]("/:id", [login to view URL]); // Update a Tutorial with id [login to view URL]("/:id", [login to view URL]); // Delete a Tutorial with id [login to view URL]("/:id", [login to view URL]); // Create a new Tutorial [login to view URL]("/", [login to view URL]); [login to view URL]("/api/tutorials", router); }; these routes are not working i need a freelancer to help me in this and also show how to check [login to view URL] in postman