node.js: Can I do a POST under a router like below?

Question

var express = require('express');
var router = express.Router();

/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: 'Express' });

});
router.post('/', function(req, res, next){
res.send("post works");
});

module.exports = router;

This is my index.js file. I used express to create an app, add my own jade file which has a form in it. Can i define a post method like that? I am new to node.js so dont really have a grasp on how this works?

I would like to add i am trying to save data to a mongodb instance.

Update: 26/11/18

I got the solution after i got the answers given down below, I am adding the GitHub link.

I have added the working files to it.

Answer 1

After searching the web for clarification at the end both the answers helped me out. I was trying to do a POST request from my route, i had the variable "router". What I overlooked was to add the function name to it. My html form was trying to submit to a function "/login" and My router did not have the function defined.

router.post('/login', function(req,res, next){
}

This did it. Thanks to everyone that tried to help.