how to set file type and size in multer


var multer = require('multer')
var upload = multer().single('avatar')

app.post('/profile', function (req, res) {
upload(req, res, function (err) {
if (err instanceof multer.MulterError) {
// A Multer error occurred when uploading.
} else if (err) {
// An unknown error occurred when uploading.
}

// Everything went fine.
})
})

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