basic backend setup

backend/.env

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+PORT=3001
+MONGO_URL=mongodb://localhost:27017/
+DB_NAME=shopify
+

backend/db.js

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+const { MongoClient } = require('mongodb');
+require('dotenv').config();
+
+const url = process.env.MONGO_URL || 'mongodb://localhost:27017/';
+const dbName = process.env.DB_NAME || 'shopify';
+
+let db = null;
+
+async function connectToMongoDB() {
+  if (db) return db;
+
+  const client = new MongoClient(url, { useNewUrlParser: true, useUnifiedTopology: true });
+
+  try {
+    await client.connect();
+    console.log('Connected successfully to MongoDB server');
+    db = client.db(dbName);
+    return db;
+  } catch (err) {
+    console.error('An error occurred while connecting to MongoDB:', err);
+    throw err;
+  }
+}
+
+module.exports = { connectToMongoDB };
+

backend/index.js

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+const express = require('express');
+const cors = require('cors');
+const mongoose = require('mongoose');
+const FormDataModel = require('./models/FormData.js');
+
+
+const app = express();
+app.use(express.json());
+app.use(cors());
+
+
+
+mongoose.connect('mongodb://127.0.0.1:27017/shopify')
+  .then(() => console.log('MongoDB connected'))
+  .catch(err => console.log('MongoDB connection error:', err));
+
+app.post('/register', async (req, res) => {
+  const { email, password } = req.body;
+
+  try {
+    const user = await FormDataModel.findOne({ email });
+
+    if (user) {
+      res.json("Already registered");
+    } else {
+      const newUser = new FormDataModel(req.body);
+      await newUser.save();
+      res.json(newUser);
+    }
+  } catch (err) {
+    res.status(500).json(err);
+  }
+});
+
+app.post('/login', async (req, res) => {
+  const { email, password } = req.body;
+
+  try {
+    const user = await FormDataModel.findOne({ email });
+
+    if (user) {
+      if (user.password === password) {
+        res.json("Success");
+      } else {
+        res.json("Wrong password");
+      }
+    } else {
+      res.json("No records found!");
+    }
+  } catch (err) {
+    res.status(500).json(err);
+  }
+});
+
+
+
+app.listen(3001, () => {
+  console.log("Server listening on http://127.0.0.1:3001");
+});

backend/models/FormData.js

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+const mongoose = require('mongoose');
+
+const FormDataSchema = new mongoose.Schema({
+    name : String,
+    email: String,
+    password: String
+})
+
+const FormDataModel = mongoose.model('log_reg_form', FormDataSchema);
+
+module.exports = FormDataModel;