server.js

const express = require("express");
const app = express();
const http = require('https')
const querystring = require("querystring")
const hb = require('express-handlebars');
const bodyParser = require('body-parser')
const path = require('path');
const $ = require('jquery');

app.use(bodyParser.urlencoded({ extended: false }))
app.use(bodyParser.json());
app.engine('handlebars', hb());
app.set('view engine', 'handlebars');
app.use("/public", express.static(__dirname + "/public"));

//OTHER
const citiesJSON = require(__dirname + '/public/cities.json')

app.get('/', (req, res) => {
    console.log('res.json: ', res.json)
    if (res.json.error) {
        res.render('index', {
            layout: 'main',
            error: 'There was an error. Please try again.'
        })
    }
    else {
        res.render('index', {layout: 'main'})
    }
})

app.post('/check-city', (req, res, next) => {
    var city = req.body.textVal.toLowerCase()
    console.log('city submitted', city)

    for (i = 0; i < citiesJSON.length; i++ ) {
        if (citiesJSON[i].city === city) {
            var city = citiesJSON[i].city
            var latitude = citiesJSON[i].latitude
            var longitude = citiesJSON[i].longitude
            var population = citiesJSON[i].population
            console.log('population: ', population)
            res.json({
                success: true,
                city: city,
                latitude: latitude,
                longitude: longitude,
                population: population,
            })
            return;
        }
    }
    res.json({ error: true })
})


app.listen(process.env.PORT || 8080, () => console.log(`I'm listening on 8080.`))