How to create a ReadStream from memoryStorage with multer

Question

I upload a file to my API using multer:

const multer = Multer({
    storage: Multer.memoryStorage(),
    limits: {
      fileSize: 5 * 1024 * 1024 // no larger than 5mb, you can change as needed.
    }
})

The file appears in const file = req.files["my_file_name"][0]

Now I want to create a readStream for this like so:

fs.createReadStream(file.path).pipe(stream);

The problem is, file.path is undefined when I'm using memoryStorage() with multer. How can I make this work with memoryStorage?

Answer 1

When using memoryStorage you will not get file.path, Your file will be in buffer on your request.

req.file will have information { fieldname, originalname, encoding, mimetype, buffer }

Output Stream on Console

const streamifier = require('streamifier');
streamifier.createReadStream(req.file.buffer).pipe(process.stdout);

Read & Write Stream as File

const streamifier = require('streamifier');
var writeStream = fs.createWriteStream('./uploads/test.png');
streamifier.createReadStream(req.file.buffer).pipe(writeStream);

Reference : File information