Blob saved as [object Object] Nodejs

Question

I want to record audio from the microphone with HTML5, then send it to the server to be saved. Currently however, the saved file just contains [object Object]

Answer 1

I finally got this working. The approach to get this to work is to encode the blob on the client, and decode it on the server.

Frontend:

// converts blob to base64
var blobToBase64 = function(blob, cb) {
  var reader = new FileReader();
  reader.onload = function() {
    var dataUrl = reader.result;
    var base64 = dataUrl.split(',')[1];
    cb(base64);
  };
  reader.readAsDataURL(blob);
};

blobToBase64(blob, function(base64){ // encode
  var update = {'blob': base64};
  $http.post('/api/save_recording', update)
    .success(function(new_recording) {
      console.log("success");
    });
});    

Backend:

exports.saveRecording = function(req, res) {
  var buf = new Buffer(req.body.blob, 'base64'); // decode
  fs.writeFile("temp/test.wav", buf, function(err) {
    if(err) {
      console.log("err", err);
    } else {
      return res.json({'status': 'success'});
    }
  }); 
};