Lecture 298:- User Sign Up

To implement user sign up functionality in an Express.js app, we need to follow these steps:

1. Create a POST route for /signup in the server.js file.
2. Install and require the bcrypt module to hash the password before storing it in the database.
3. Create a Mongoose schema for the User model and define the required fields, such as email and password.
4. In the POST route for /signup, retrieve the email and password from the request body.
5. Hash the password using bcrypt and save the new user in the database using the User model.
6. Create a session for the user by adding a user property to the req.session object.
7. Redirect the user to the home page or any other desired page.

Here's an example implementation of these steps:

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// server.js const express = require('express'); const mongoose = require('mongoose'); const bodyParser = require('body-parser'); const bcrypt = require('bcrypt'); const session = require('express-session'); const app = express(); mongoose.connect('mongodb://localhost:27017/myapp', { useNewUrlParser: true, useUnifiedTopology: true }); const db = mongoose.connection; db.on('error', console.error.bind(console, 'MongoDB connection error:')); app.set('view engine', 'ejs'); app.use(bodyParser.urlencoded({ extended: false })); app.use(bodyParser.json()); app.use(session({  secret: 'myapp',  resave: false,  saveUninitialized: true })); const userSchema = new mongoose.Schema({  email: { type: String, required: true },  password: { type: String, required: true } }); const User = mongoose.model('User', userSchema); app.get('/', (req, res) => {  res.render('index'); }); app.post('/signup', async (req, res) => {  const { email, password } = req.body;  const hashedPassword = await bcrypt.hash(password, 10);  const user = new User({    email,    password: hashedPassword  });  await user.save();  req.session.user = user;  res.redirect('/'); }); app.listen(3000, () => console.log('Server started on port 3000'));

In this example, we've used the bcrypt module to hash the password before storing it in the database. We've also used the express-session middleware to create a session for the user. Finally, we've added a POST route for /signup that saves the new user to the database and creates a session for them.