检查routes中的success变量,并在

我正在制作meanstack应用程序,我正在注册用户。在routes.js中,如果用户添加成功,我将返回一个JSON对象。

router.post('/register',(req,res,next)=>{
let newUser= new User({
    name:req.body.name,
    username:req.body.username,
    email:req.body.email,
    password:req.body.password
});

User.addUser(newUser,(err,user)=>{
    if(err)
    {
        res.json({success:false,msg:'Failed to Register User'});
    }
    else
    {
        res.json({success:true,msg:'Registered Sucessfully'});
    }
})})

现在,我想检查是否返回并显示success true 但我收到一个奇怪的错误

类型“object”上不存在属性“success”

this.authService.registerUser(user).subscribe(data=>{
  console.log(data);
  if(data.success)   //<---- PROPERTY 'success' DOESNOT EXIST ON TYPE 'object'
  {
    this.flashMessage.show("You are now Registered and Can LogIN",{cssClass:'alert-sucess',timeout:3000});
    this.router.navigate(['/login']);

  }
  else
  {
    this.flashMessage.show("Something Went Wrong",{cssClass:'alert-danger',timeout:3000});
    this.router.navigate(['/register']);
  }

})

这是我的 服务 班

registerUser(user){
let headers= new HttpHeaders().set('Content-Type','application/json');
return this.http.post('http://localhost:3000/api/register',user,{headers:headers})}