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PDF along with text not getting uploaded to Express from React

I want to send book details along with the pdf of the book to the database.
This is a portion of my react code.
const {user}=useSelector((state)=>state.auth)
const [file, setFile] = useState(null);
const dispatch = useDispatch()
const { values, errors, touched, handleBlur, handleChange, handleSubmit, setFieldValue } = useFormik({
initialValues: initialValues,
validationSchema: addBookSchema,
onSubmit: async(values, { resetForm }) => {
// i have used FormData only to send pdf
const formData = new FormData()
formData.append('title', values.title)
formData.append('author', values.author)
formData.append('rating', values.rating)
formData.append('numOfRatings', values.numOfRatings)
formData.append('total', values.total)
formData.append('genre', values.genre)
formData.append('file', file)
const response = await axios.post('http://localhost:5000/api/admin', formData, {
headers: {
"Content-Type": "multipart/form-data",
Authorization: `Bearer ${user.token}`,
},
});
console.log(response.data);
resetForm()
}
})
return (
// some code
<Box>
<TextField
id="pdf-input"
// label="Upload PDF"
type="file"
accept=".pdf"
// className={classes.textField}
onChange={handleFileChange}
margin="normal"
/>
</Box>
// some code
Below is my express controller which handles this input from react
// this is to start connection
const url = process.env.MONGO_URI;
const connect = mongoose.createConnection(url, { useNewUrlParser: true, useUnifiedTopology: true });
let gfs;
connect.once('open', () => {
// initialize stream
gfs = new mongoose.mongo.GridFSBucket(connect.db, {
bucketName: "uploads"
});
});
// this is the controller
const addBook = asyncHandler(upload.single('file'),async (req, res) => {
console.log(req.file.file);
console.log(req.body);
// nothing gets logged in console
res.status(200).json(req.body)
});
below is my upload middleware used in my controller
const path = require("path");
const multer = require("multer");
const { GridFsStorage } = require("multer-gridfs-storage");
const crypto = require("crypto");
const storage = new GridFsStorage({
url: process.env.MONGO_URI,
file: (req, file) => {
return new Promise((resolve, reject) => {
crypto.randomBytes(16, (err, buf) => {
if (err) {
return reject(err);
}
const filename = buf.toString("hex") + path.extname(file.originalname);
const fileInfo = {
filename: filename,
bucketName: "uploads",
};
resolve(fileInfo);
});
});
},
});
const upload = multer({ storage });
module.exports = upload;
i get the following errors
//1. if i do formData.append('file', file) then i get "Warning: An unhandled error was caught from submitForm()"
//2. if i do formData.append('ebook', file) then i get "message: 'Unexpected field', stack: 'MulterError: Unexpected field\n"
//3. Nothing gets logged in my console when i console.log(req.body) in my controller.
Note: I am able to successfully send data to my database if i do not use FormData and do not take file input.
I tried various methods but i could not identify the problem. Any helps is very much appreciated. Thanks in advance.

React-js: How to upload Image with preview and display the processe image

Looking for some help in creating a React-js component to upload an image with preview and display the returned processed Image. API server return a binary png and not a url to the image. Resulting image should be displayed in a separate Div
Regards
I am not able to find a good example to upload image to a API server and display the returned binary image file

Use this code as a sample:
const MyComponent = () => {
const [previewImage, setPreviewImage] = useState(null);
const [uploadedImage, setUploadedImage] = useState(null);
const handleUploadImage = () => {
const data = new FormData();
data.append('files[]', previewImage);
fetch(/* server url */, { method: 'POST', body: data }).then(async (response) => {
const imageResponse = await response.json();
setUploadedImage(imageResponse);
}).catch((err) => {
});
}
const handleSelectImage = (event) => {
const file = event.target.files[0];
const fileReader = new FileReader();
fileReader.addEventListener("load", () => {
setPreviewImage(fileReader.result);
});
fileReader.readAsDataURL(file);
}
return (
<div>
<input type="file" onChange={handleSelectImage} />
{
previewImage ?
<img src={previewImage} alt="preview-image" />
:
null
}
{
uploadedImage ?
<img src={uploadedImage} alt="uploaded-image" />
:
null
}
<button onClick={handleUploadImage}>Upload</button>
</div>
);
}

Upload multiple files using formidable and vue js

Hey guys i am trying to make an app in which i neeed to upload multiple files
but in my node backend when i try to upload files using postman it works
but while using with vue js it does not work
this is my node backend where i use formidable and try to upload images
app.post('/multiple', (req, res) => {
var form = new formidable.IncomingForm(),
files = [],
fields = [];
form.on('field', function (field, value) {
console.log('fields is', field);
fields.push([field, value]);
});
form.on('file', function (field, file) {
console.log('i came inside file');
console.log(file.name);
const oldPath = file.path;
const newPath = path.join(__dirname, 'uploads/' + file.name);
const rawData = fs.readFileSync(oldPath);
console.log('old path', oldPath);
fs.writeFileSync(newPath, rawData);
console.log('file uploaded');
console.log(JSON.stringify(field));
files.push([field, file]);
});
form.on('end', function () {
console.log('done');
});
form.parse(req);
console.log(files);
return res.json(files);
});
and this is my vue js front end component code
this is html code for vue js
<template>
<div>
<button #click="items++">Add One More File</button>
<form #submit.prevent="handleImageUpload">
<div v-for="item in items" :key="item">
<input type="file" #change="handleFile($event, item)" />
</div>
<input type="submit" />
</form>
</div>
</template>
and this is script tag for component
<script>
import axios from 'axios';
export default {
data() {
return {
items: 1,
files: [],
};
},
methods: {
async handleImageUpload() {
try {
const fd = new FormData();
this.files.map((index, file) => {
fd.append(index, file);
});
const { data } = await axios.post('http://localhost:5000/multiple', fd);
console.log('data from backend is ', data);
} catch (error) {
console.log(error);
}
},
handleFile(e, item) {
console.log(e);
this.files[item - 1] = e.target.files[0];
},
},
};
</script>
now what happend when I request backend with form data everything goes undefined there

ok so it was my mistake , I was writing map function the wrong way
it should be
this.files.map((file,index) => {

How to update files using Axios and React

I've built an api with posts/articles, and now I'm working on the front end. I'm having an issue with uploading a new photo for an already existing post. I've attempted the two most common methods for the photo, formData and JSON Base64. I'm receiving the same error response for both methods, Please upload a file, code: 400. I'm not certain where I've gone wrong, so I'll provide every relevant file.
articles.js(server)
exports.articlePhotoUpload = asyncHandler(async (req, res, next) => {
const article = await Article.findById(req.params.id);
if (!article) {
return next(
new ErrorResponse(`Article not found with id of ${ req.params.id }`, 404)
);
}
//Make sure user is article owner || make sure user is admin
if (article.user.toString() !== req.user.id || req.user.role !== 'admin') {
return next(
new ErrorResponse(
`User ${ req.user.id } is not authorized to update this article`,
)
)
}
if (!req.files) {
return next(new ErrorResponse(`Please upload a file`, 400))
}
const file = req.files.file;
// Confirm the image is a photo
if (!file.mimetype.startsWith('image')) {
return next(new ErrorResponse(`Please upload an image file`, 400))
}
// Check File Size
if (file.size > process.env.MAX_FILE_UPLOAD) {
return next(
new ErrorResponse(`Please upload an image less than ${ MAX_FILE_UPLOAD }`, 400)
)
}
// Create custom filename
file.name = `photo_${ article._id }${ path.parse(file.name).ext }`;
file.mv(`${ process.env.FILE_UPLOAD_PATH }/${ file.name }`, async err => {
if (err) {
console.log(err);
new ErrorResponse(`Problem with file upload`, 500);
}
await Article.findByIdAndUpdate(req.params.id, { photo: file.name });
res.status(200).json({
success: true,
data: file.name
});
});
});
^the above function is where the error message is triggered server-side.
axios.js(client-side)
...
axios.defaults.baseURL = 'http://<<ip address>>/api/v1';
axios.defaults.headers.common['Authorization'] = 'Bearer ' + localStorage.getItem('auth');
axios.defaults.headers.post['Content-Type'] = 'application/json';
export const uploadPhoto = (id, data) => {
return axios.put(`/articles/${ id }/photo`, {
data
})
}
...
^I have a feeling I could format this exported function better. I might be missing something here.
UploadPhoto.jsx(JSON Attempt)
const UploadPhoto = (props) => {
const { register, handleSubmit } = useForm();
const { state } = useStateMachine(updateAction);
const [file, setFile] = useState(null);
const [filename, setFilename] = useState(null);
const onSubmit = async () => {
const toBase64 = file => new Promise((resolve, reject) => {
const reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = () => resolve(reader.result);
reader.onerror = error => reject(error);
console.log(reader.result)
});
const data = {
title: filename,
file: await toBase64(file),
}
uploadPhoto(`5ea5e73044718d0b2c2ae5df`, data)
.then(res => console.log(res))
.catch(err => console.log(err.response.data.error))
}
const handleChange = (e) => {
setFile(e.target.files[0]);
setFilename(e.target.files[0].name);
}
return (
<form onSubmit={handleSubmit(onSubmit)}>
<h2>Cover Image</h2>
<label>
Select A File:
</label>
<img id="image" src="" alt="" />
<input
type="file"
name="photo"
ref={register}
defaultValue={state.data.photo}
onChange={handleChange}
/>
<label htmlFor="">
Filename
</label>
<input type="submit" />
</form>
)
}
export default withRouter(UploadPhoto);
UploadPhoto.jsx(formData attempt)
const onSubmit = () => {
const formData = new FormData();
formData.append("file", file);
console.log(file)
uploadPhoto(`5ea5e73044718d0b2c2ae5df`, formData)
.then(res => console.log(res))
.catch(err => console.log(err.response.data.error))
}
This is my first time building my own api, which is why I put the server code in here. However, I'm 90% sure I'm making a mistake client-side, most likely in the axios.js file.

Let's try this example:
const fileUpload = require('express-fileupload');
const app = express();
// enable files upload -- this should also make 'req.files' accessible
app.use(fileUpload({
createParentPath: true
}));
Add this in the beginning of your server initialization. After that your normal code should try accessing req.files as it should be filled on file upload requests now.
You will need to install module express-fileupload before using it in code -> npm i express-fileupload
(Source: https://attacomsian.com/blog/uploading-files-nodejs-express)

can't upload a image to express api with Multer from react

I want to upload a image from my react app to my express API.
i made something like this in vainla js and it work ed with same endpoint but in react project doesn't work .
I created a react component like this:
import React, { useState } from "react";
import BackupIcon from "#material-ui/icons/Backup";
import url from "../url";
import Preview from "./Preview";
const AdaugaImg = props => {
const [file, setFile] = useState(null);
const [ales, setAles] = useState(false);
const [imgUrl, setImgUrl] = useState("");
const modificare = e => {
//console.log(e.target.value);
setFile(e.target.files[0]);
setAles(true);
const urlImg = URL.createObjectURL(e.target.files[0]);
//console.log(urlImg);
//reader.onloadend = e => setImgUrl(reader.result);
setImgUrl(urlImg);
};
const upload = async e => {
e.preventDefault();
setAles(false);
console.log("incarcare");
console.log(file);
try {
const data = new FormData();
data.append("img", file);
const res = await fetch(`${url}/add`, {
method: "POST",
data: data
});
console.log(await res.json());
} catch (error) {
console.log(error);
}
};
const closePreview = () => setAles(false);
const preview = ales ? (
<Preview imgUrl={imgUrl} closePreview={closePreview} />
) : null;
return (
<div className="upload">
{preview}
<form method="POST" onSubmit={upload}>
<input
type="file"
name="img"
id="poza"
style={{ width: 0.1, height: 0.1 }}
onChange={modificare}
/>
{!ales ? (
<label for="poza" className="upload-label">
<p>Selecteaza o poza</p>
</label>
) : null}
<button className="upload-btn" type="submit">
<BackupIcon />
<p>Incarca poza</p>
</button>
</form>
</div>
);
};
export default AdaugaImg;
them I wrote code. for api using multer
const router = require("express").Router();
const multer = require("multer");
const storage = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, "img-biserici/");
},
filename: function(req, file, cb) {
cb(null, file.fieldname + "_" + Date.now() + "_.jpg");
}
});
const upload = multer({
storage: storage
});
router.post("/add", upload.array("img", 1), (req, res) => {
console.log(req.files[0]);
res.json({ ok: true });
});
when I upload image in console it shows me this error:TypeError: Cannot read property '0' of undefined .what I missed?and how to fix this?

You are missing content type in headers.
const res = await fetch(`${url}/add`, {
method: "POST",
data: data,
headers: {
'Content-Type': 'multipart/form-data'
}
});