Express error - TypeError: Router.use() requires middleware function but got a Object

if you are still facing this problem and try every solution then just replace router with routes and it worked fine

If you use in routes

```js
exports default router
```

Your solution can be
```js
module.exports = router
```

I had the same error , fixed it by replacing `app.use('view engine', 'ejs')` with `app.set('view engine', 'ejs')`.
For reference I used this webpage [Migrating from 3.x to 4.x][1]


I didn't have to make any changes to either index.js or application.js. For more information on EJS one could refer [Using EJS with Express][2] and [Express 4.x API][3]


[1]:

[To see links please register here]

[2]:

[To see links please register here]

[3]:

[To see links please register here]

Whew, my problem was that i was doing module.exports = { router } instead of module.exports = router

For anybody using EJS:
In my case I was receiving this error as I used
```js
app.use("view engine","ejs")
```
instead of
```js
app.get("view engine","ejs")
```