포스트맨에서 Success 나오는데 서버로가면 값이 안나와요ㅠ

//index.js
const express = require('express')
const app = express()
const port = 5000
const bodyParser = require('body-parser');

const config = require('./config/key');

const { User } = require("./models/User");



//application/x-www-form-urlencoded
app.use(express.urlencoded({extended: true}));

//application/json
app.use(express.json());

const mongoose = require('mongoose')
mongoose.connect(config.mongoURI,{
  useNewUrlParser: true,useUnifiedTopology:true,useCreateIndex:true,useFindAndModify:false
}).then(() =>console.log('MongoDB Connected...'))
  .catch(err =>console.log(err))



app.get('/', (req, res) => res.send('Hello SOSO!!!!!!!!!!!!!!!~~'))

app.post('/register',(req,res) => {
  //회원가입할때 필요한 정보들을 client에서 가져오면
  // 그것들을 데이터베이스에 넣어준다.

    const user = new User(req.body)

    user.save((err, userInfo) =>{
      if(err) return res.json({success: false,err})
      return res.status(200).json({
        success: true
      })
    })
})

app.listen(port, () => console.log(`Example app listening at http://localhost:${port}!`))

//User.js
const mongoose = require('mongoose');
const bcrypt = require('bcrypt');
const saltRounds = 10;
const userSchema = mongoose.Schema({
    name: {
        type: String,
        maxlength:50
    },
    email: {
        type: String,
        trim:true,
        unique:1
    },
    password:{
        type: String,
        minlength: 5
    },
    lastname:{
        type:String,
        maxlength:50
    },
    role: {
        type:Number,
        default:0
    },
    image:String,
    token: {
        type:String
    },
    tokenExp: {
        type:Number
    }
})
userSchema.pre('save',function( next ){
    var user = this;
    if(user.isModified('password')){
        //비밀번호 암호화시킨다.
        bcrypt.genSalt(saltRounds, function(err, salt) {
            if(err) return next(err);

            bcrypt.hash(user.password, salt, function(err, hash){
                if(err) return next(err);
                user.password = hash;
                next();
            })
        })
    }
    else{
        next();
    }

})

const User = mongoose.model('User',userSchema)

module.exports = { User }

req.body 찍어보면 빈객체로 나와요