catchBlobStream.js

const saveImgTemp = function (req, res, next) {
  const writeStream = fs.createWriteStream(
    path.join(__dirname, "../store/test.png")
  );
  req.pipe(writeStream);
  // After all the data is saved, respond with a simple html form so they can post more data
  req.on('end', function () {
    res.send({msg: "Works"})
  });

  // This is here incase any errors occur
  writeStream.on('error', function (err) {
    console.log(err);
  });
};

uploadBlobStream.js

handleSendImage() {
  const server = this.host;

  fetch(this.image)
    .then((img) => img.blob())
    .then((blob) => {
      fetch(server, {
      	method: 'POST',
	      body: blob,
	      responseType: 'stream',
	      headers: {
		      'content-type': blob.type,
				},
			});
		});
},