Error: .post() requires callback functions but got a [object Undefined] not working

Instead of this:

app.post('/user/all',Controller.Create);

You try for:

app.post('/user/all', function(req, res){
  Controller.Create
});

In my case it was because I had a misspelling between the router and controller file. Check both so that they match, the error .POST() requires callback functions but got a [object Undefined] has nothing to do with the real problem.

You are only missing

module.exports = app, or whatever you are exporting. This happened to me many times.