MulterError：意外字段

如何解决MulterError：意外字段

我正在尝试使用 multer 和 multer gridfs 上传图像，但它给了我这个错误...请看一看并建议我修复...提前致谢。

[MulterError：意外字段][1] 在wrappedFileFilter (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/multer/index.js:40:19) 在巴士小哥。 (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/multer/lib/make-middleware.js:114:7) 在 Busboy.emit (events.js:315:20) 在 Busboy.emit (/home

//imports
import express from 'express';
import mongoose from 'mongoose';
import cors from 'cors';
import multer from 'multer';
import GridFsstorage from 'multer-gridfs-storage';
import Grid from 'gridfs-stream';
// import bodyParser from 'body-parser';
import path from 'path';
import Pusher from 'pusher';
// import { MongoClient } from 'mongodb';

Grid.mongo = mongoose.mongo;

//app config
const app = express();
const port = process.env.PORT || 8000;

//middlewares
app.use(express.json()); //Used to parse JSON bodies
app.use(express.urlencoded({ extended: true })); //Parse URL-encoded bodies
app.use(cors());
//db config
const mongoURI =
    'mongodb+srv://admin:atul1210@cluster0.avlrm.mongodb.net/fbdb?retryWrites=true&w=majority';
const conn = mongoose.createConnection(mongoURI,{
    useCreateIndex: true,useNewUrlParser: true,useUnifiedTopology: true,});

mongoose
    .connect(mongoURI,{
        useCreateIndex: true,})
    .then(() => {
        console.log('connection successful...');
    })
    .catch((err) => {
        console.log('connection Failed...');
    });

mongoose.connection.once('open',() => console.log('DB COnnected'));

var gfs;

conn.once('open',() => {
    console.log('DB Connected');

    gfs = Grid(conn.db,mongoose.mongo);
    gfs.collection('images');
});

const storage = new GridFsstorage({
    url: mongoURI,file: (req,file) => {
        return new Promise((resolve,reject) => {
            {
                const filename = `image-${Date.Now()}${path.extname(
                    file.originalname
                )}`;

                const fileInfo = {
                    filename: filename,bucketName: 'images',};
                resolve(fileInfo);
            }
        });
    },});

const upload = multer({ storage: storage });
// console.log({ storage });

//api routes
app.get('/',(req,res) => res.status(200).send('hello world'));

app.post('/upload/image',upload.single('file'),res) => {
    console.log('>>>>>',req.file);

    res.status(201).send(req.file);
});

// listen
app.listen(port,() => console.log(`listening on localhost ${port}`));

/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/busboy/lib/main.js:38:33) 在 PartStream。 (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/busboy/lib/types/multipart.js:213:13) 在 PartStream.emit (events.js:315:20) 在 HeaderParser。 (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/dicer/lib/Dicer.js:51:16) 在 HeaderParser.emit (events.js:315:20) 在 HeaderParser._finish (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/dicer/lib/HeaderParser.js:68:8) 在 SBMH。 (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/dicer/lib/HeaderParser.js:40:12) 在 SBMH.emit (events.js:315:20) 在 SBMH._sbmh_Feed (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/streamsearch/lib/sbmh.js:159:14) 在 SBMH.push (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/streamsearch/lib/sbmh.js:56:14) 在 HeaderParser.push (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/dicer/lib/HeaderParser.js:46:19) 在 Dicer._oninfo (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/dicer/lib/Dicer.js:197:25) 在 SBMH。 (/home/atul/Documents/coding/project and practice/fb-clone-backend/node_modules/dicer/lib/Dicer.js:127:10)