ajinkya-mhetre-mern/backend/src/controllers/authController.js

A MERN starter with frontend and backend folders

// ===== src/controllers/authController.js =====
const jwt = require('jsonwebtoken');
const User = require('../models/User');

const generateToken = (id) => {
  return jwt.sign({ id }, process.env.JWT_SECRET, {
    expiresIn: process.env.JWT_EXPIRE
  });
};

const register = async (req, res) => {
  try {
    const { name, email, password, phone, role, address, farmDetails } = req.body;

    const existingUser = await User.findOne({ email });
    if (existingUser) {
      return res.status(400).json({ message: 'User already exists' });
    }

    const userData = {
      name,
      email,
      password,
      phone,
      role,
      address
    };

    if (role === 'farmer' && farmDetails) {
      userData.farmDetails = farmDetails;
    }

    const user = await User.create(userData);
    const token = generateToken(user._id);

    res.status(201).json({
      success: true,
      message: role === 'farmer' 
        ? 'Registration successful. Account pending verification.' 
        : 'Registration successful',
      token,
      user: {
        id: user._id,
        name: user.name,
        email: user.email,
        role: user.role,
        isVerified: user.isVerified
      }
    });
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

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

    const user = await User.findOne({ email });
    if (!user || !(await user.comparePassword(password))) {
      return res.status(401).json({ message: 'Invalid credentials' });
    }

    const token = generateToken(user._id);

    res.json({
      success: true,
      message: 'Login successful',
      token,
      user: {
        id: user._id,
        name: user.name,
        email: user.email,
        role: user.role,
        isVerified: user.isVerified
      }
    });
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

const getProfile = async (req, res) => {
  try {
    res.json({
      success: true,
      user: req.user
    });
  } catch (error) {
    res.status(500).json({ message: error.message });
  }
};

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