TypeError: The 'data' argument must be of type string or Buffer in Node.js crypto.update() for Password Reset

I am working on a password reset feature in a Node.js/Express application using Sequelize and the crypto module to hash passwords. When I send a POST request to my /reset-password endpoint, I get the following error:

Error in resetPassword: The "data" argument must be of type string or an instance of Buffer, TypedArray, or DataView. Received undefined.

Here's the relevant code for the resetPassword function:

import crypto from "crypto";
import { User } from "../models/user.js"; // Sequelize model
import { Op } from "sequelize";
import logger from "../utils/logger.js";

export const resetPassword = async (req, res) => {
  try {
    const { token, password } = req.body;

    // Find user by reset token
    const user = await User.findOne({
      where: {
        reset_token: token,
        reset_token_expires: { [Op.gt]: new Date() },
      },
    });

    if (!user) {
      return res.status(400).json({ message: "Invalid or expired reset token" });
    }

    // Hash new password
    const hashedPassword = crypto
      .createHash("sha256")
      .update(password)
      .digest("hex");

    // Update user password and clear reset token
    await user.update({
      password: hashedPassword,
      reset_token: null,
      reset_token_expires: null,
    });

    res.status(200).json({ message: "Password reset successful" });
  } catch (error) {
    logger.error("Error in resetPassword:", error);
    res.status(500).json({ message: "Error resetting password" });
  }
};

Additional info: Node.js version: 18.x Express version: 4.x Sequelize version: 6.x

The error indicates that the password variable in the resetPassword function is undefined, causing the crypto.createHash("sha256").update(password) call to fail. This is because the crypto.update() method expects a string, Buffer, TypedArray, or DataView, but it's receving undefined.