validate request body before uploading a file using multer in nodejs - node.js

Question

I want to upload user profiles according to their school ids
// import multer
var multer = require('multer')
// import school and student models
const { School } = require('./models/school/school.model.js')
const { Student } = require('./models/student/student.model.js')
// configure multer
const storage = multer.diskStorage({
destination: (req, file, cb) => {
const dir = `./uploads/schools/${req.body.schoolId}/students`
fs.exists(dir, exist => {
if (!exist) {
return fs.mkdir(dir, { recursive: true }, error => cb(error, dir))
}
return cb(null, dir)
})
},
filename: (req, file, cb) => {
cb(null, `student-${normaliseDate(new Date().toISOString())}.${file.originalname.split('.')[file.originalname.split('.').length - 1]}`)
}
})
var upload = multer({storage: storage}).single('profile')
app.post('/student', function (req, res) {
// check if submitted school id is valid
let school = await School.findOne({ _id: req.body.schoolId })
if (!school)
return res.send(`School of id ${req.body.schoolId} doesn't exist`)
// upload the profile pic
upload(req, res, function (err) {
if (err)
return res.send(err)
})
// save the student
let newStudent = new Student({
name: req.body.name,
email: req.body.email,
school: req.body.schoolId,
profile: req.file.filename
})
const saveDocument = await newStudent.save()
if (saveDocument)
return res.send(saveDocument).status(201)
return res.send('New College not Registered').status(500)
})
but when I try to access req.body before uploading the profile I get an empty object.
I would upload the profiles in a tempolary folder and move them later but what if the submitted school id is invalid ?? this will require me to delete the uploaded file. so I want to make sure the submitted details are valid and then upload the profile later save the student.

Answer 1

Check your codes, you are using await but async is nowhere to be found. Though it may not be the cause of getting an empty req.body object.
let school = await School.findOne({ _id: req.body.schoolId })
const saveDocument = await newStudent.save()

Answer 2

I am not sure of how you are sending data to the backend but try these option it may work
remember that when javascript is sending POST data from client to server it sends them according to how they are arranged so if you have your client form like this
<form action="">
<input type="file" name="pic">
<input type="text" name="username">
<input type="number" name="age">
</form>
it will send file named pic first, then text named username secondly and finally send number named age, so if you are getting empty req.body while the file has not been completely uploaded you might check this if it is the problem because javascript process them on an order according to how they were sent
i hope this gonna help