Advanced node and express registration of new users

Here is an example of how to implement user registration using Node.js, Express.js, and a MongoDB database:

Step 1: Set up the project

Create a new Node.js project and install the required dependencies:

npm init -y
npm install express body-parser mongoose

Step 2: Create the database model

Create a new file called user.model.js and add the following code:

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  name: String,
  email: { type: String, unique: true },
  password: String
});

const User = mongoose.model('User', userSchema);

module.exports = User;

This defines a User model with three fields: name, email, and password.

Step 3: Create the registration route

Create a new file called register.js and add the following code:

const express = require('express');
const router = express.Router();
const User = require('../models/user.model');
const bcrypt = require('bcrypt');

router.post('/register', (req, res) => {
  const { name, email, password } = req.body;

  if (!name ||!email ||!password) {
    return res.status(400).send({ message: 'All fields are required' });
  }

  User.findOne({ email }, (err, user) => {
    if (err) {
      return res.status(500).send({ message: 'Error occurred' });
    }

    if (user) {
      return res.status(400).send({ message: 'Email already exists' });
    }

    const hashedPassword = bcrypt.hashSync(password, 10);

    const newUser = new User({
      name,
      email,
      password: hashedPassword
    });

    newUser.save((err) => {
      if (err) {
        return res.status(500).send({ message: 'Error occurred' });
      }

      res.send({ message: 'User created successfully' });
    });
  });
});

module.exports = router;

This route handles the registration request by:

Extracting the name, email, and password from the request body.
Checking if all fields are provided. If not, return a 400 error.
Checking if the email already exists in the database. If it does, return a 400 error.
Hashing the password using bcrypt.
Creating a new User document and saving it to the database.
Returning a success message if the user is created successfully.

Step 4: Add the route to the Express app

In your app.js file, add the following code:

const express = require('express');
const app = express();
const registerRouter = require('./register');

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.use('/register', registerRouter);

app.listen(3000, () => {
  console.log('Server started on port 3000');
});

This sets up the Express app to use the registerRouter and listens for incoming requests on port 3000.

Step 5: Test the registration route

Use a tool like Postman or cURL to send a POST request to http://localhost:3000/register with the following JSON payload:

{
  "name": "John Doe",
  "email": "[email protected]",
  "password": "password123"
}

If the registration is successful, you should receive a response with a success message. If there is an error, you should receive an error message with a 400 or 500 status code.

That's it! You now have a basic user registration system using Node.js, Express.js, and MongoDB.

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Advanced node and express registration of new users