In express.js POST method not getting called - mongodb

Question

I'm trying to put up a simple form handling project. The post method is not getting called. There is no output from the post method. I do not understand why this is happening. What is the issue here?
This is the code I'm using.
var express = require('express');
var bodyParser = require('body-parser');
var multer = require('multer');
var upload = multer();
var app = express();
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/my_db');
var personSchema = mongoose.Schema({
name: String,
age: Number,
nationality: String,
});
var Person = mongoose.model('Person', personSchema);
app.get('/', function(req, res) {
res.render('person');
});
app.set('view engine', 'pug');
app.set('views', './views');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(upload.array());
app.use(express.static('public'));
app.post('/', function(req, res) {
var personInfo = req.body; //Get the parsed information
if (!personInfo.name || !personInfo.age || !personInfo.nationality) {
res.render('show_message', {
message: 'Sorry, you provided worng info',
type: 'error',
});
} else {
var newPerson = new Person({
name: personInfo.name,
age: personInfo.age,
nationality: personInfo.nationality,
});
newPerson.save(function(err, Person) {
if (err) res.render('show_message', { message: 'Database error', type: 'error' });
else
res.render('show_message', {
message: 'New person added',
type: 'success',
person: personInfo,
});
});
}
});
app.listen(3000);
I would like to know how to fix this issue.
I tried putting a console.log() output to log if the post method is being called. But there was no output from it either.