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Welcome, in this video we will see a Complete User Login Route with Functionality in one Video in our MERN Application.

One thing is very important that is

   if (user) {
      res.status(200).json({
        message: "Login Successful",
        token: await userExist.generateToken(),
        userId: userExist._id.toString(),
      });

const User = require("../models/auth-model");
const bcrypt = require("bcryptjs");

// *-------------------
// Home Logic
// *-------------------
const home = async (req, res) => {
  try {
    res.status(200).json({ msg: "Welcome to our home page" });
  } catch (error) {
    console.log(error);
  }
};

// *-------------------------------
//* User Registration Logic 📝
// *-------------------------------
// 1. Get Registration Data: 📤 Retrieve user data (username, email, password).
// 2. Check Email Existence: 📋 Check if the email is already registered.
// 3. Hash Password: 🔒 Securely hash the password.
// 4. Create User: 📝 Create a new user with hashed password.
// 5. Save to DB: 💾 Save user data to the database.
// 6. Respond: ✅ Respond with "Registration Successful" or handle errors.

const register = async (req, res) => {
  try {
    // const data = req.body;
    console.log(req.body);
    const { username, email, phone, password } = req.body;

    const userExist = await User.findOne({ email: email });

    if (userExist) {
      return res.status(400).json({ msg: "email already exists" });
    }

    const userCreated = await User.create({ username, email, phone, password });

    // res.status(201).json({ message: "User registered successfully" });
    res.status(201).json({
      msg: "Registration Successful",
      token: await userCreated.generateToken(),
      userId: userCreated._id.toString(),
    });
  } catch (error) {
    res.status(500).json({ message: "Internal server error" });
  }
};

// *-------------------------------
//* User Login Logic 📝
// *-------------------------------

const login = async (req, res) => {
  try {
    const { email, password } = req.body;

    const userExist = await User.findOne({ email });

    if (!userExist) {
      return res.status(400).json({ message: "Invalid credentials" });
    }

    // const user = await bcrypt.compare(password, userExist.password);
    const isPasswordValid = await userExist.comparePassword(password);

    if (isPasswordValid) {
      res.status(200).json({
        message: "Login Successful",
        token: await userExist.generateToken(),
        userId: userExist._id.toString(),
      });
    } else {
      res.status(401).json({ message: "Invalid email or passord " });
    }
  } catch (error) {
    res.status(500).json({ message: "Internal server error" });
  }
};

module.exports = { home, register, login };

auth-model.js

// comparePassword
userSchema.methods.comparePassword = async function (password) {
  return bcrypt.compare(password, this.password);
};

auth-route.js

const express = require("express");
const router = express.Router();
const authControllers = require("../controllers/auth-controller");

router.route("/").get(authControllers.home);
router.route("/register").post(authControllers.register);
router.route("/login").post(authControllers.login);

module.exports = router;