MaxInterview - how to set file type and size in multer

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1var multer = require('multer')
2var upload = multer().single('avatar')
3
4app.post('/profile', function (req, res) {
5  upload(req, res, function (err) {
6    if (err instanceof multer.MulterError) {
7      // A Multer error occurred when uploading.
8    } else if (err) {
9      // An unknown error occurred when uploading.
10    }
11
12    // Everything went fine.
13  })
14})
15

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