Node.js requires callback functions but got a [object Object]

Question

I'm trying to do upload using node.js.

router.post('/image', [ multer(), function(req, res) {
  var file = req.files.file;
  console.log(file);
  res.end();
}]);

What's wrong with above code? I'm getting error of

Error: Route.post() requires callback functions but got a [object Object]
    at Route.(anonymous function) [as post] 

Answer 1

Most likely you're following an older tutorial that uses multer 's older API. The API changed ~v1.0.0 and you can find an example of the new API here . For example:

 var upload = multer();
 router.post('/image', [ upload.any(), function(req, res) {
   var file = req.files.file;
   console.log(file);
   res.end();
 }]);

Answer 2

There is something wrong about router parameters & multer usage. You should see multer documentation

Here is an example to help you fit your code.

var multer  = require('multer');
var upload = multer({ dest: 'uploads/' });

router.post('/image', upload.single("image"), function(req, res) {
    var file = req.file;
    console.log(file);
    res.end();
}]);