problem encountered while attempting to transmit data to multer in React

Question

problem encountered while attempting to transmit data to multer in React

I was attempting to upload an image to the backend using Multer. I have reviewed the backend code multiple times and it appears to be correct. Could there be an issue with my front-end code? Here is a POST code snippet:


const response = await fetch('http://localhost:5000/api/users/signup',{
                method:'POST',
                headers:{
                    'Content-Type': 'application/json'
                },
                body:JSON.stringify({
                    name: data.get('name'),
                    email: data.get('email'),
                    password: data.get('password'),
                    image:data.get('image')
                  })
            });

Here is my full auth.js code for reference: https://pastebin.com/MHdDRtAX

javascript reactjs post multer mern

Answer 1

Answer №1

One possible solution would be to utilize the FormData object in this scenario.

const inputField = document.querySelector('input[type="file"]');
const formDataBody = new FormData();

formDataBody.append('image', inputField.files[0]);
formDataBody.append('name', formData.get('name'));
formDataBody.append('email', formData.get('email'));
formDataBody.append('password', formData.get('password'));
// You can add more items as necessary

const serverResponse = await fetch(endpointURL, { method:'POST', body: formDataBody });

Answer 2

One possible solution would be to utilize the FormData object in this scenario.

const inputField = document.querySelector('input[type="file"]');
const formDataBody = new FormData();

formDataBody.append('image', inputField.files[0]);
formDataBody.append('name', formData.get('name'));
formDataBody.append('email', formData.get('email'));
formDataBody.append('password', formData.get('password'));
// You can add more items as necessary

const serverResponse = await fetch(endpointURL, { method:'POST', body: formDataBody });

Answer 3

Answer №2

There seems to be a mismatch in the content type. When utilizing multer, it is necessary to specify

'Content-Type': 'multipart/form-data'

. The basic concept revolves around using the FormData object.

An illustrative example is provided below

const data = new FormData(event.target) 
const response = await fetch('http://localhost:5000/api/users/signup',{
                    method:'POST',
                    headers:{
                        'Content-Type': 'multipart/form-data'
                    },
                    body: data
                });

If you examine the network tab, you will notice form data with key-value pair. Ensure that the image is treated as a binary file in multer implementation.

For instance, refer to this code snippet using multer:

var express = require('express')
var multer  = require('multer')
var upload = multer({ dest: 'uploads/' })
 
var app = express()    
app.post('api/users/signup', upload.single('image'), function (req, res, next) {
    // req.file refers to the `image` file
    // req.body holds the text fields, if any are present
})

Answer 4

There seems to be a mismatch in the content type. When utilizing multer, it is necessary to specify

'Content-Type': 'multipart/form-data'

. The basic concept revolves around using the FormData object.

An illustrative example is provided below

const data = new FormData(event.target) 
const response = await fetch('http://localhost:5000/api/users/signup',{
                    method:'POST',
                    headers:{
                        'Content-Type': 'multipart/form-data'
                    },
                    body: data
                });

If you examine the network tab, you will notice form data with key-value pair. Ensure that the image is treated as a binary file in multer implementation.

For instance, refer to this code snippet using multer:

var express = require('express')
var multer  = require('multer')
var upload = multer({ dest: 'uploads/' })
 
var app = express()    
app.post('api/users/signup', upload.single('image'), function (req, res, next) {
    // req.file refers to the `image` file
    // req.body holds the text fields, if any are present
})

problem encountered while attempting to transmit data to multer in React

Answer №1

Answer №2

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