TypeError: app.use() requires middleware functions

this is the example code:

app.use logger 'dev'
app.use bodyParser.json()
app.use bodyParser.urlencoded()
app.use multer inMemory: yes

when it executes, throw an TypeError from app.use multer: inMemory: yes:

TypeError: app.use() requires middleware functions
    at EventEmitter.use (/Users/ran/github/lbs-app/node_modules/express/lib/application.js:206:11)
    at Object.<anonymous> (/Users/ran/github/lbs-app/app.js:69:7)
    at Object.<anonymous> (/Users/ran/github/lbs-app/app.js:108:4)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Module.require (module.js:365:17)
    at require (module.js:384:17)
    at Object.<anonymous> (/Users/ran/github/lbs-app/bin/www:7:11)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)
    at Module.load (module.js:355:32)
    at Function.Module._load (module.js:310:12)
    at Function.Module.runMain (module.js:501:10)
    at startup (node.js:124:16)

I was confused at first, because the same code works well on my laptap, and when I check the dependencies’ version, I found multer: 0.1.8 => 1.0.1…

[LinusU]

@sagarpandav Could it be that you have forgot to do module.exports = in your routes/index.js file?

[macneib]

So I’m thinking you had the same problem as me. I had my multer configuration in my express config file, so now I’m rushing a fix to get it nested in to a route.

for example: in my routes.js file

module.exports = function(app) {
<-SNIP->
  app.use('/api/uploads', require('./api/upload'));
<-SNIP->
};

and in /api/uploads/index.js

'use strict';
var express = require('express');
var controller = require('./upload.controller');

var multer = require('multer');
var os = require('os');
var uuid = require('node-uuid');
var storage = multer.diskStorage({
  destination: function (req, file, cb) { cb(null, os.tmpdir()) },
  filename: function (req, file, cb) { cb(null, uuid.v4());}
});
// Create the multer instance here
var upload = multer({ storage: storage, limits: { fileSize: 10 * 1024 * 1024}});

var router = express.Router();

// File Upload route
router.post('/', upload.single('file'), controller.upload);

module.exports = router;

I’m still finishing up my code, but that’s a rough idea of what the change is. Good luck!