Unable to add properties in a MongoDB document - node.js

Question

I am trying to implement password reset functionality in a MERN application. Whenever a user enters their email (for which they want to reset the password) and clicks on the "Send Password Reset Link" button, a POST request is made to the route "/account/forgot".
In the route handler function, I check whether any user with the given email exists or not. If a user exists, then I add resetPasswordLink and resetPasswordExpires properties to the user object and send a message "You have been emailed a password link" to the client.
The problem I am facing is I get the message at the frontend.
However, whenever I check the database, I don't see resetPasswordLink and resetPassworExpires properties being added to the user.
Where is the problem?
The code snippets are given below:
server/routes/passwordResetRoutes.js
const express = require("express");
const crypto = require("crypto");
const asyncHandler = require("express-async-handler");
const User = require("../models/userModel");
const router = express.Router();
router.post(
"/forgot",
asyncHandler(async (req, res, next) => {
const user = await User.findOne({ email: req.body.email });
if (user) {
user.passwordResetToken = crypto.randomBytes(20).toString("hex");
user.passwordResetExpires = Date.now() + 3600000;
await user.save();
res.json({
message: "You have been emailed a password reset link",
});
} else {
const err = new Error("No account with that email exists");
err.status = 404;
next(err);
}
})
);
module.exports = router;
server/models/userModel.js
const mongoose = require("mongoose");
const bcrypt = require("bcryptjs");
const userSchema = new mongoose.Schema({
firstName: {
type: String,
required: true,
},
lastName: {
type: String,
required: true,
},
email: {
type: String,
unique: true,
required: true,
},
password: {
type: String,
required: true,
},
resetPasswordToken: {
type: String,
},
resetPasswordExpires: {
type: Date,
},
});
userSchema.methods.matchPassword = async function (incomingPassword) {
return await bcrypt.compare(incomingPassword, this.password);
};
userSchema.pre("save", async function (next) {
if (!this.isModified("password")) {
next();
}
const salt = await bcrypt.genSalt(10);
this.password = await bcrypt.hash(this.password, salt);
});
const User = mongoose.model("User", userSchema);
module.exports = User;

Answer 1

You're trying to update the passwordResetToken and passwordResetExpires fields but they are not present in the User model. That's why the user.save() call does nothing. They should be resetPasswordToken and resetPasswordExpires respectively.
user.resetPasswordToken = crypto.randomBytes(20).toString('hex')
user.resetPasswordExpires = Date.now() + 3600000
await user.save()