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Multer: how to name files after req.body parameters

I am trying to upload a file with a form like below

<input type="file" name="collateral" />
<input type="hidden" name="id" value="ABCDEFG" />
<input type="submit" value="Upload Image" name="submit">

and I would like to rename the file to the input name id (ABCDEFG). Since I cannot access the req.body through the rename: (filename, filename) function, I was wondering how I would do this?

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Try putting the file last in your POST request payload.

Then you can access req.body

via this callback:



var multer  = require('multer');

var storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, './public/uploads/')
    },
    filename: function (req, file, cb) {
        cb(null, file.fieldname + '-' + Date.now())
        // access req.body and rename file 
    }
});

var upload = multer({ storage: storage });
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