Get form data in node service

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Node.js

Angular6

Hi,

I am trying to get formdata from Angular to node service.
I have added below code.
But its not working.
Its giving

MulterError: Unexpected field

error.

What I have tried:

code : HTML

<form method="post" enctype="multipart/form-data">
  <div class="form-group">
    <input type="file" class="form-control" name="file" accept=".xlsx">
  </div>
 </form>

Angular Service call:

postReports(formdata : FormData){
   debugger;
   return this.http.post(this.baseURL, formdata);
 }

Node : controller

var express = require('express');
var router = express.Router();
var multer = require('multer');
var upload = multer();

var routes = function()
{
    router.route('/').post(upload.fields([]), function(req , res) {
        debugger;
        let formData = req.body;
        debugger;
        console.log(req);
        console.log(res);
    });

    return router;
};

Its giving error

500 (Internal Server Error) MulterError: Unexpected field

Can any one please help me..

Thanks...