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

Question

There have been some middleware changes on the new version of express and I have made some changes in my code around some of the other posts on this issue but I can\'t get a

Answer 1

I was getting the same error message but had a different issue. Posting for others that are stuck on same.

I ported the get, post, put, delete functions to new router file while refactoring, and forgot to edit the paths. Example:

Incorrect:

//server.js
app.use('/blog-posts', blogPostsRouter);

//routers/blogPostsRouter.js
router.get('/blog-posts', (req, res) => {
  res.json(BlogPosts.get());
});

Correct:

//server.js
app.use('/blog-posts', blogPostsRouter);

//routers/blogPostsRouter.js
router.get('/', (req, res) => {
  res.json(BlogPosts.get());
});

Took a while to spot, as the error had me checking syntax where I might have been wrapping an argument in an object or where I missed the module.exports = router;

Answer 2

In any one of your js pages you are missing

module.exports = router;

Check and verify all your JS pages

Answer 3

You are missing router exports module and that is the reason why this error is present.

use module.exports = router; and that would work