我试图创建一个新用户，但是数据没有保存在MongoDB Atlas中。我的服务器成功连接到MongoDB Atlas，并且它还从Insomnia中的JSON文件中获取数据。
下面是auth.js文件

import mongoose from "mongoose"
import User from "../models/User.js"
import bcrypt from "bcryptjs"

export const signup = async (req, res) => {
    console.log(req.body)
    try {
        const salt = bcrypt.genSaltSync(10);
        const hash = bcrypt.hashSync(req.body.password, salt);
        const newUser = new User({ ...req.body, password: hash});

        await newUser.save();
        res.status(200).send("User has been created!")
    } catch(err) {
        // todo
    }
}

下面是index.js文件

import express from "express";
import mongoose from "mongoose";
import dotenv from "dotenv";
import userRoutes from "./routes/users.js";
import videoRoutes from "./routes/videos.js";
import commentRoutes from "./routes/comments.js";
import authRoutes from "./routes/auth.js"

const app = express()
dotenv.config()

const connect = () => {
    mongoose
        .connect(process.env.MONGO)
        .then(() => {
        console.log("Connected to DB")
        })
        .catch((err) => {
            throw err;
        });
};

app.use(express.json())
app.use("/api/auth", authRoutes)
app.use("/api/users", userRoutes)
app.use("/api/videos", videoRoutes)
app.use("/api/comments", commentRoutes)

app.listen(8800, ()=> {
    connect()
    console.log("Connected to Server")
})

老实说，我看不出我的代码有任何错误，但它也不工作。有没有人可以友好地帮助我的问题？