MVP Backend APIs finished

backend/.gitignore

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+.env
+node_modules/

backend/index.js

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+const express = require("express");
+const session = require("express-session");
+const bodyParser = require("body-parser");
+const mongoose = require("mongoose");
+const cors = require("cors");
+
+const authRoutes = require("./src/routes/auth.routes");
+const courseRoutes = require("./src/routes/courses.routes");
+require("dotenv").config();
+
+const url = process.env.MONGODB_URI;
+
+const app = express();
+
+app.use(cors());
+
+app.use(
+  session({
+    secret: process.env.SESSION_SECRET_KEY,
+    resave: false,
+    saveUninitialized: true,
+    cookie: { maxAge: 60 * 60 * 1000 }
+  })
+);
+
+app.use(bodyParser.json());
+
+app.use("/auth", authRoutes);
+app.use("/courses", courseRoutes);
+
+mongoose
+  .connect(url)
+  .then(() => {
+    console.log("Connected to database ");
+    const port = process.env.PORT || 3000;
+    app.listen(port, () => {
+      console.log(`Server is running on port ${port}`);
+    });
+  })
+  .catch((err) => {
+    console.error(`Error connecting to the database. \n${err}`);
+  });