mongoose: validation error on post request - mongodb

Question

I'm trying to save a new use in mongodb with mongoose, but I am getting ValidationError: "err": "User validation failed:Path 'email' is required., Path 'fname' is required., Path 'username' is required phone: Path phone .despite I make all the data in the body of the post request so:
this is the userModel:
import mongoose from "mongoose";
const userSchema = new mongoose.Schema({
_id: {type: Number},
name: {type: String, required: true},
fname: {type: String, required: true},
phone: {type: String, required: true},
email: {type: String, required: true, unique: true},
password: {type: String, required: false},
image: {type: String, required: false},
isAdmin: {type: Boolean, default: false, required: true},
}, {
timeStamps: true
});
const User = mongoose.model('User', userSchema);
export default User;
this is the userRouter.js:
import express from "express";
import data from '../../data.js';
import User from "../userModel.js";
import expressAsyncHandler from "express-async-handler";
import {generateToken} from "../../utils.js";
import bcrypt from "bcryptjs";
const userRouter = express.Router();
let allUsers = data.users;
userRouter.get("/seed", expressAsyncHandler(async(req, res)=>{
//await User.remove({});
const createdUsers = await User.insertMany(allUsers);
res.send({createdUsers});
}));
userRouter.post("/register", expressAsyncHandler(async(req, res)=> {
//await User.remove({});
const user = new User({
name: req.body.name,
fname: req.body.fname,
phone: req.body.phone,
email: req.body.email,
});
const createdUser = await user.save();
res.send({
_id: createdUser._id,
name: createdUser.name,
fname: createdUser.fname,
phone: createdUser.phone,
email: createdUser.email,
token: generateToken(createdUser)
})
}))
export default userRouter;