NodeJs Multer error

Question

I'm getting the follow error while trying to retrieve uploaded files. I've searched the net and all I found is that people are injecting the result from multer() as midleware but all I got is errors ...

/node_modules/express/lib/router/index.js:458
  throw new TypeError('Router.use() requires middleware function but got a
        ^
TypeError: Router.use() requires middleware function but got a Object
at Function.use (/node_modules/express/lib/router/index.js:458:13)
at EventEmitter.<anonymous> (/node_modules/express/lib/application.js:219:21)
at Array.forEach (native)
at EventEmitter.use (/node_modules/express/lib/application.js:216:7)
at Object.<anonymous> (/app.js:40:5)
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)

Here is the code of that part of the app

var express = require('express');
var multer = require('multer');
var mul = multer({limits : {fileSize : 1000000, files : 10}});
var app = express();
var port = 3000;
var server = require('http');
app.use('/files', mul, files);
function files (req, res) {
  console.log(req.files, req.file);
}
server = server.createServer(app);
server.listen(process.env.PORT || port);

please refer here: [multer error](http://stackoverflow.com/questions/31496100/cannot-app-usemulter-requires-middleware-function-error) — Ashish Yadav, Mar 06 '17 at 06:58
Please refer here: [multer error](http://stackoverflow.com/questions/31496100/cannot-app-usemulter-requires-middleware-function-error) — Ashish Yadav, Mar 06 '17 at 06:59

shershen · Accepted Answer · 2015-11-02T17:07:58.027

2

Code you have for configuring routes and multer seems a bit wrong. Thats's how it's described to be here. Second parameter(s) in app.use should be function or functions app.use docs while mul in your code is an Object, result of your configuration factory call earlier here : var mul = multer({limits : {fileSize : 1000000, files : 10}});

//other stuff    
var mul = multer({limits : {fileSize : 1000000, files : 10}});

app.use('/files', [mul, files]);

function files (req, res) {
  console.log(req.files, req.file);
}
//other stuff

UPD

did you try like this, according to docs on module page?

var mul = multer({ dest: 'your_uploads_path/' });
app.use('/files', mul.array(), files); //or other option

other options are here: https://www.npmjs.com/package/multer#multer-opts

UPD2

According to docs multer indeed returns object, that should be consumed by busboy, so you need it to be required and configured as well - https://github.com/mscdex/busboy#busboy-methods

edited Nov 02 '15 at 17:07

answered Nov 02 '15 at 14:51

shershen

9,875
11
39
60

what error you get in that case?, when you have 'app.use('/files', [mul, files]);' – shershen Nov 02 '15 at 15:10
The same that express expects function but gets an Object – Иво Стратев Nov 02 '15 at 15:19
did you tryed use example from official multer page - https://www.npmjs.com/package/multer ? check updated answer – shershen Nov 02 '15 at 16:21
It doesn't throw an error but the request doesn't get captured eighter. if you mean the one with multer().array() – Иво Стратев Nov 02 '15 at 16:51
yes - one of the options single, array or fields. Did you also tried changing app.use to app.post ? – shershen Nov 02 '15 at 16:53
with app.post and var mul = multer({limits : {fileSize : 1000000, files : 10}}); still throws. – Иво Стратев Nov 02 '15 at 17:02
with app.post and var mul = multer({limits : {fileSize : 1000000, files : 10}}); and app.post(...,mul,...); still throws but with mul.any() works well. but your ans helped me so I'm going to close the q – Иво Стратев Nov 02 '15 at 17:10

score 2 · Answer 2 · answered Nov 02 '15 at 17:13

2

Here is the code that works, thanks to @shershen

//other stuff    
var mul = multer({limits : {fileSize : 1000000, files : 10}});
app.use('/files', mul.any(), files);
function files (req, res) {
console.log(req.files, req.file);
}
//other stuff

answered Nov 02 '15 at 17:13

Иво Стратев

405
2
6
18

NodeJs Multer error

2 Answers2