Upload Image and PDF in rest API using node js with mongoose - node.js

Question

I have try to insert some data into mongodb database using node js REST API but I got an error Unexpected field Im new to node please help me. whitePaper is my pdf file If I upload data like title, description and image only it gives the Correct answer with status code 201 but I try to upload all data and pdf but it gives the error
model code:
description: {
type: String,
required: true
},
imgURL: {
type: String,
required: true
},
whitePaperLink: {
type: String,
required: true,
},
app.js file
app.use('/whitePaper', express.static('whitePaper'));
router file
const whitePaperLink = multer.diskStorage({
destination: './whitePaper/',
filename: (req, file, cb) => {
return cb(null, `${file.fieldname}_${Date.now()}${path.extname(file.originalname)}`);
}
});
const whitePaperFilter = (req, file, cb) => {
if (file.mimetype === 'application/pdf') {
cb(null, true)
} else {
cb(null, false)
}
};
const whitePaperUpload = multer({
storage: whitePaperLink,
limits: {
fileSize: 1024 * 1024 * 5
},
fileFilter: whitePaperFilter
});
router.post('/', checkAuth, imageUpload.single('imgURL'), whitePaperUpload.single('whitePaperLink'),
PostController.create_Post)
controller file
exports.create_Post = async (req, res) => {
const post = new Post({
title: req.body.title,
category: req.body.category,
description: req.body.description,
imgURL: req.file.path,
whitePaperLink: req.file.path,
publishDate: req.body.publishDate,
});
try {
const addPost = await post.save()
res.status(201).json({
message: 'Post Added Succesfully.'
})
} catch (error) {
console.log(error);
res.status(500).json({
message: error
})
}
}

Answer 1

If you'll use upload.single for each field it'll give error Unexpected Field.
Multer takes all files at once for execution, and in your case you've 2 different files and it'll take both files to upload.single.
So, instead of upload.single use upload.fields.
In your route.js, do it like this:
const destination = (req, file, cb) => {
switch (file.mimetype) {
case 'image/jpeg':
cb(null, './images/');
break;
case 'image/png':
cb(null, './images/');
break;
case 'application/pdf':
cb(null, './whitePaper/');
break;
default:
cb('invalid file');
break;
}
}
const storage = multer.diskStorage({
destination: destination,
filename: (req, file, cb) => {
return cb(null, `${file.fieldname}_${Date.now()}${path.extname(file.originalname)}`);
}
});
const fileFilter = (req, file, cb) => {
if (file.mimetype === 'image/jpeg' || file.mimetype === 'image/png' || file.mimetype === 'application/pdf') {
cb(null, true)
} else {
cb(null, false)
}
};
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 5,
},
fileFilter: fileFilter
});
// add post
router.post('/', upload.fields([{ name: 'imgURL', maxCount: 1 }, { name: 'whitePaperLink', maxCount: 1 }]), PostController.create_Post)
Edit:
You can also do it like this:
const uploadPostData = (req, res, next) => {
upload.fields([{ name: 'imgURL', maxCount: 1 }, { name: 'whitePaperLink', maxCount: 1 }])(req, res, (err) => {
console.log(req.files);
req.body.imgURL = req.files.imgURL[0].path.replace('/\\/g','/');
req.body.whitePaperLink = req.files.whitePaperLink[0].path.replace('/\\/g','/');
next()
})
}
// add post
router.post('/', uploadPostData, PostController.create_Post)