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file upload multier MulterError: Unexpected field

Not able to upload image in MongoDB database using NodeJS
Middleware fieldName and key name is also same still not working. no solution on internet
server.js
import cookieParser from "cookie-parser";
import multer from "multer";
export const app = express();
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({extended: true}))
let upload = multer()
app.use(upload.array())
app.use("/",routLog,router)
app.listen(process.env.PORT,()=>{
db()
console.log(`Server is Runing on http://localhost:${process.env.PORT}`)
})
blogroute.js
import { fileUploder } from "../middelware/fileUploder.js";
export const blogRouter = Router()
blogRouter.post('/:user/create-post', fileUploder.single("file"), blogsController.createPos
This middleware file fileUplad.js which is use to store in upload folder and then from that will store in MongoDB in buffer ferment
import { randomBytes } from "crypto";
import multer from "multer";
import path from "path";
const storage = multer.diskStorage({
destination: './upload',
filename: async (req, file, callback) => {
return await randomBytes(16, (err, buf) => {
if (err) {
return reject(err);
}
const filename = buf.toString("hex") + path.extname(file.originalname);
const fileInfo = {
filename: filename,
bucketName: "upload"
};
resolve(fileInfo);
})
}
})
export const fileUploder = multer({
storage: storage,
limits: { fileSize: 2000 },
fileFilter: (req, file, callback) => {
allowedFileTypes = /jpeg|jpg|png|gif/;
if (file.mimetype == 'jpg' || file.mimetype == 'jpeg' || file.mimetype == 'png', file.mimetype == 'gif') {
return cb(null, true);
} else {
cb("Invalid file type. Only JPEG, PNG and GIF file are allowed.")
}
}
})
MulterError: Unexpected field
at wrappedFileFilter (/mnt/ssd/BlogProject/backendapi/node_modules/multer/index.js:40:19)
at Multipart.<anonymous> (/mnt/ssd/BlogProject/backendapi/node_modules/multer/lib/make-middleware.js:107:7)
at Multipart.emit (node:events:527:28)
at HeaderParser.cb (/mnt/ssd/BlogProject/backendapi/node_modules/busboy/lib/types/multipart.js:358:14)
at HeaderParser.push (/mnt/ssd/BlogProject/backendapi/node_modules/busboy/lib/types/multipart.js:162:20)
at SBMH.ssCb [as _cb] (/mnt/ssd/BlogProject/backendapi/node_modules/busboy/lib/types/multipart.js:394:37)
at feed (/mnt/ssd/BlogProject/backendapi/node_modules/streamsearch/lib/sbmh.js:248:10)
at SBMH.push (/mnt/ssd/BlogProject/backendapi/node_modules/streamsearch/lib/sbmh.js:104:16)
at Multipart._write (/mnt/ssd/BlogProject/backendapi/node_modules/busboy/lib/types/multipart.js:567:19)
at writeOrBuffer (node:internal/streams/writable:389:12)```

This is simple example :
let multer = require('multer');
let multerImage = multer().single('file');
function uploadAvatar(req, res) {
let phone = data.phoneNumber;
multerImage(req, res, () => {
let file = req.file;
if (isUndefined(file))
return Json.builder(Response.HTTP_BAD_REQUEST);
let {
fileUrl
} = File.validationAndWriteFile(file.buffer, Util.getFileFormat(file.originalname));
Update.img(phone, fileUrl, result => {
if (!result)
return Json.builder(Response.HTTP_BAD_REQUEST);
Json.builder(Response.HTTP_OK);
});
});
}

uploading two files from two fields with multer as middleware

i'm trying to upload two files with different file extensions with multer from two fields but when i try it with postman the result always for the file is null, what is the solution for my problem? here is my code
middleware/uploadEpub
const multer = require('multer')
exports.uploadEpub = (epubFile, coverFile) => {
const storage = multer.diskStorage({
destination: function (req, file, cb) {
cb(null, "uploads")
},
filename: function (req, file, cb) {
cb(null, Date.now() + '-' + file.originalname.replace(/\s/g, ""))
}
})
const upload = multer({
storage
}).fields([{name: "bookFile", maxCount: 1},{name: "coverFile", maxCount: 1}])
}
controller/book
exports.addBook = async (req, res) => {
try {
const { ...data } = req.body
const newBook = await book.create({
...data,
bookFile: req.file,
coverFile: req.file
})
let bookData = await book.findOne({
where: {
id: newBook.id
},
attributes:{
exclude: ['createdAt','updatedAt']
}
})
bookData = JSON.parse(JSON.stringify(bookData))
res.send({
status: "Success",
Book: {
...bookData
}
})
} catch (error) {
console.log(error)
res.status(500).send({
status: "Failed",
message: "Server Error"
})
}
}

Multer set up
const multer = require('multer')
const path = require('path')
const { nanoid } = require('nanoid')
//Set Storage Engine
const storage = multer.diskStorage({
destination: './public/uploads/',
filename: (req, file, callback) => {
const id = nanoid(6)
const newFilename = `${file.fieldname}_${id}-${new Date().toISOString().replace(/:/g, '-')}${path.extname(file.originalname)}`
callback(null, newFilename)
}
})
const upload = multer({
storage: storage,
limits: { fileSize: 5572864 }, // up to 5.5 MB
fileFilter: (req, file, callback) => {
checkFileType(file, callback)
},
})
//Check File Type
const checkFileType = (file, cb) => {
//Allowed extensions
const fileType = /jpeg|jpg|png|gif|svg|pdf|epub/
//Check extension
const extname = fileType.test(path.extname(file.originalname).toLowerCase())
//Check mimetype
const mimetype = fileType.test(file.mimetype)
if (extname && mimetype) {
return cb(null, true)
} else {
return cb('Error: wrong file type!')
}
}
module.exports = upload
/***** middlewares.js *****/
module.exports.imageUploader = (req, res, next)=>{
const files = req.files
const uploadedFiles = []
for (var i = 0; i <images.length; i++){
uploadFiles.push('https://yourserver.com/public/uploads/' + files[i].filename)
}
req.uploadFiles = uploadFiles.toString() //appending files to req
next()
return
}
/**** index.js or app.js ****/ //where your routes are defined
router.post('/books/add', upload.array('images', 10), imageUploader, book.addBook) // allowing up to 10 files to be uploaded, calling imageUploader as a middleware
/*** Controllers/book ***/
exports.addBook = async (req, res) => {
const uploadedFiles = req.uploadFiles; //catching files from imageUploader middleware
// ... rest of your code
}

Try to upload the file as form-data in postman, and put the key with the same name that you have set in multer, the postman will look like this:

Try this:
const cpUpload = upload.fields([{ name: 'avatar', maxCount: 1 }, { name: 'gallery', maxCount: 8 }])
app.post('/cool-profile', cpUpload, function (req, res, next) {
})

Multer doesn't save the file

Multer does not save the file and I cannot see any logs... The folder is empty, no any files.
The image data is actually sent to the server as its console logged:
Screenshot of req.files from log
What am I doing wrong? Please help me find
const express = require('express');
const router = express.Router();
const path = require('path');
const multer = require('multer');
const storage = multer.diskStorage({
destination: (req, file, cb) => {
console.log('destination') // can't see this log
cb(null, './uploads/');
},
filename: (req, file, cb) => {
console.log('filename') // can't see this log
const ext = file.mimetype.split("/")[1];
cb(null, Date.now() + path.extname(file.originalname));
}
});
const uploadImage = multer({
storage,
limits: { fieldSize: 1024 * 1024 },
fileFilter: (req, file, cb) => {
console.log('log!') // can't see this log
const ext = path.extname(file.originalname);
if (ext !== '.jpg' && ext !== '.jpeg' && ext !== '.png') {
console.log('not log!') // can't see this log
const err = new Error('Extention');
err.code = 'EXTENTION';
return cb(err);
}
console.log('log!') // can't see this log
cb(null, true);
}
}).single('photo');
router.post('/image', async (req, res) => {
console.log(req.files) // can see this log
uploadImage(req, res, err => {
console.log('upload') // can see this log
let error = '';
if (err) {
console.log(err)
if (err.code === 'LIMIT_FILE_SIZE') {
error = 'Max 500kb!';
}
if (err.code === 'EXTENTION') {
error = 'Only jpg and png!';
}
}
res.json({
ok: !error,
error
});
})
});

Multer finally gave an error, so the problem was resolved... The problem was that the names of these fields are different:
Server:
.single('pic');
And in the request to the server:
formData.append('pic', file);

The code seems to work fine for me but I just had to manually create the uploads directory.
I used postman to test this and the picture appeared in my uploads directory.
# Console Output
SERVER RUNNING ON 3000
undefined
log!
log!
destination
filename
upload

How to set field name to upload file single/array Multer NodeJs

I have a code for upload images in nodejs using multer and sharp. But i want to ask how to set dynamic array name at line 19? I want to set that array name from the nodejs routes, because my field name in mongodb collections is different in every collection.
This is my middleware upload code:
const multer = require("multer");
const sharp = require("sharp");
const multerStorage = multer.memoryStorage();
const multerFilter = (req, file, cb) => {
if (file.mimetype.startsWith("image")) {
cb(null, true);
} else {
cb("Please upload only images.", false);
}
};
const upload = multer({
storage: multerStorage,
fileFilter: multerFilter
});
const uploadFiles = upload.array("images", 10); //Change this 'images' name from route
const uploadImages = (req, res, next) => {
uploadFiles(req, res, err => {
if (err instanceof multer.MulterError) {
if (err.code === "LIMIT_UNEXPECTED_FILE") {
return res.send("Too many files to upload.");
}
} else if (err) {
return res.send(err);
}
next();
});
};
const resizeImages = async (req, res, next) => {
if (!req.files) return next();
req.body.images = [];
await Promise.all(
req.files.map(async file => {
const filename = file.originalname.replace(/\..+$/, "");
const newFilename = `cariboss-${filename}-${Date.now()}.jpeg`;
await sharp(file.buffer)
.resize(640, 320)
.toFormat("jpeg")
.jpeg({ quality: 90 })
.toFile(`uploads/${newFilename}`);
req.body.images.push(newFilename);
})
);
next();
};
const getResult = async (req, res) => {
if (req.body.images.length <= 0) {
return res.send(`You must select at least 1 image.`);
}
const images = req.body.images
.map(image => "" + image + "")
.join("");
return res.send(`Images were uploaded:${images}`);
};
module.exports = {
uploadImages: uploadImages,
resizeImages: resizeImages,
getResult: getResult
};
My routes code:
module.exports = app => {
const articles = require("../controllers/articles.controller.js");
const upload = require("../middlewares/upload");
var router = require("express").Router();
router.post("/", upload.uploadImages, upload.resizeImages, upload.getResult, articles.create);
app.use("/api/article", verifyToken, router);
};
I have already search the solution on internet, but there is nothing. Thanks for your help sir.

Node.js: Multer upload with promise?

I have this express route with multer file-upload. When the upload is complete, I would like to encode the image to base64 and send with response.
However when I do it like this, the code tries to execute the base64 encoding before the file is created to the folder.
Edit: Added storage & upload functions
const storage = multer.diskStorage({
destination: (req, file, callback) => {
if (!fs.existsSync('./uploads')) {
fs.mkdirSync('./uploads');
}
let path = './uploads';
callback(null, path);
},
filename(req, file, cb) {
let fileExt = file.originalname.substring(file.originalname.lastIndexOf('.')).toLowerCase();
if (!imageFilter(fileExt)) {
return false;
} else {
cb(null, file.originalname);
}
},
onError: function (err, next) {
console.log('error', err);
next(err);
},
});
const upload = multer({
storage,
limits: {
fileSize: 1000 * 1000 * 2 // 2 MB
}
}).single('file');
router.post('/upload', function (req, res) {
var directory = 'uploads';
fs.readdir(directory, (err, files) => {
if (err) throw err;
for (var file of files) {
fs.unlink(path.join(directory, file), err => {
if (err) throw err;
});
}
});
upload(req, res, function (err) {
if (err) {
return res.status(404).json({
success: false,
message: 'File is too large. (Max 2MB)'
});
}
var file = req.file;
var base64str = base64_encode('./uploads/' + file.originalname);
return res.status(200).json({
success: true,
url: 'http://' + ip.address() + ':' + constants.PORT + '/api/uploads/' + file.originalname,
image: 'data:image/png;base64,' + base64str
});
});
});
What would be the smartest way to achieve the right order of operations. Possibly promises or async/await?

This solution worked for me :
Node v8.4.0 is required for this
//app.js
const fs = require('fs');
const express = require('express');
const cors = require('cors');
const bodyParser = require('body-parser');
const app = express();
app.use(cors({credentials: true, origin: 'http://localhost:4200'}));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
const Uploader = require('./Uploader.js');
const uploader = new Uploader();
app.post('/upload', uploader.startUpload);
//Uploader.js
const util = require("util");
const crypto = require("crypto");
const multer = require('multer');
class Uploader {
constructor() {
const storageOptions = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, __dirname + '/uploads/')
},
filename: function(req, file, cb) {
crypto.pseudoRandomBytes(16, function(err, raw) {
cb(null, raw.toString('hex') + Date.now() + '.' + file.originalname);
});
}
});
this.upload = multer({ storage: storageOptions });
}
async startUpload(req, res) {
let filename;
try {
const upload = util.promisify(this.upload.any());
await upload(req, res);
filename = req.files[0].filename;
} catch (e) {
//Handle your exception here
}
return res.json({fileUploaded: filename});
}
}
Edit :
The library "util" provide you a "promisify" method which will give you the possibility to avoid something called the "callback hell". It converts a callback-based function to a Promise-based one.
This is a small example to understand my code above:
const util = require('util');
function wait(seconds, callback) {
setTimeout(() => {
callback();
}, seconds);
}
function doSomething(callType) {
console.log('I have done something with ' + callType + ' !');
}
// Default use case
wait(2 * 1000, () => {
doSomething('callback');
});
const waitPromisified = util.promisify(wait);
// same with promises
waitPromisified(2000).then((response) => {
doSomething('promise');
}).catch((error) => {
console.log(error);
});
// same with async/await
(async () => {
await waitPromisified(2 * 1000);
doSomething('async/await');
})();
Will print :
I have done something with callback !
I have done something with promise !
I have done something with async/await !