Why can't send form-data in postman - json

Question

Trying to send form-data in postman and sequelize return error:
value cannot be null
But when send raw request with json all ok. Trying body-parser and multer, but nothing working
This is my index.ts
import express from "express";
import fileUpload from "express-fileupload"
...
const app = express()
const PORT = process.env.PORT || 5100
app.use(cors())
app.use(express.json())
app.use('/api', router)
app.use(fileUpload({}))
app.use(errorHandler)
const start = async () => {
try {
await sequelize.authenticate()
await sequelize.sync()
console.log(chalk.cyanBright('Successful conection to data base'));
app.listen(PORT, () => { console.log(chalk.cyanBright(`Server has been started on port ${PORT}`)) })
}
catch (e) {
console.log(e);
}
}
start()
And this is my controller
export const DeviceController = {
async create(req: Request, res: Response, next:nextType) {
try {
const { brandId, typeId, name, price } = req.body
const img = req.files
let filename = 'uuid.v4()' + '.jpg'
img?.mv(path.resolve(__dirname, '..', 'static', filename))
const device = await Models.Device.create({ brandId, typeId, name, price, img: filename })
return res.json(device)
} catch (error: any) {
next(ApiError.badRequest(error.message))
console.log(error);
}

Answer 1

app.use(express.json())
You have body parsing middleware for JSON request bodies.
You don't have body parsing middleware for multipart/form-data request bodies. The documentation for body-parser lists a several middlewares you could use.
Trying body-parser
… which says it doesn't support that format
and multart
… that doesn't appear to exist. Do you mean multiparty? Or maybe multer?
We can't tell you what you did wrong without seeing your attempt.
Re edit:
You said:
const img = req.files
img?.mv(path.resolve(__dirname, '..', 'static', filename))
But the documentation says:
console.log(req.files.foo); // the uploaded file object
The files property contains all the files, indexed by the the names given to them in the multipart request.
You're trying to read that collection of files as if it were a single file.