multer - req.file is undefined.

Question

I am creating an app using Node, Express and Handlebars and multer for uploading images. Every time I submit the form, req.file is undefined. I've spent the entire day troubleshooting but can't figure out what I'm doing wrong.

Router File:

const express = require('express');
const router = express.Router();
const multer = require('multer');
const mongoose = require('mongoose');
const path = require('path');
const methodOverride = require('method-override');


//Set Storage Engine
const storage = multer.diskStorage({
    destination: './public/uploads/images',
    filename: function (req, file, cb) {
        cb(null, file.fieldname + '-' + Date.now() + 
    path.extname(file.originalname));
    }
});

const upload = multer({
    storage: storage
}).single('featuredImage');

//Change Featured Image - POST
router.post('/saveImage/:id', (req, res) => {
    console.log(req.file);

    //removed the rest of the code to keep it simple. req.file here is always undefined.

});

Form

<form action="/saveImage/{{pitch.id}}" method="POST" enctype="multipart/form-data">

    <div class="form-group">
        <label for="featuredImage">Featured Image</label>
         <input type="file" name="featuredImage" id="featuredImage">
     </div>

     <input type="submit" value="SAVE">
</form>

app.js these requires are in the app.js file.

const express = require('express');
const exphbs  = require('express-handlebars');
const path = require('path');
const passport = require('passport');
const mongoose = require('mongoose'); 
const bodyParser = require('body-parser');
const flash = require('connect-flash');
const session = require('express-session');
const methodOverride = require('method-override');
const nodemailer = require('nodemailer');

//Set StaticFolder
app.use(express.static(path.join(__dirname, 'public')));

as per git issues, even if you are using upload.single(), you will get file in req.files instead of req.file So try req.files and post back — sidgujrathi
@sidgujrathi You are wrong my friend. It will still be req.file docs — Bharathvaj Ganesan
Yes, it will still be req.file. tries req.files anyway and it was undefined. — Uzair

Bharathvaj Ganesan Bharathvaj Ganesan · Accepted Answer · 2018-02-27T10:00:17

You need to add upload.single('featuredImage') as middleware for the respective route as follows.

const upload = multer({storage: storage});

//Change Featured Image - POST
router.post('/saveImage/:id',upload.single('featuredImage'), (req, res) => {
    console.log(req.file);

   //removed the rest of the code to keep it simple. req.file here is always undefined.

});

multer - req.file is undefined.

4 Answers