index.js

const http = require('http');
const fs = require('fs');
const port = process.env.port || 3000;
var requests = require('requests');

const homeData = fs.readFileSync('home.html', 'utf-8');
const replaceVal = (tempVal, orgVal) => {
    let temperature = tempVal.replace("{%tempval%}", orgVal.main.temp);
    temperature = temperature.replace("{%location%}", orgVal.name);
    temperature = temperature.replace("{%mintemp%}", orgVal.main.temp_min);
    temperature = temperature.replace("{%maxtemp%}", orgVal.main.temp_max);
    temperature = temperature.replace("{%country%}", orgVal.sys.country);

    return temperature;
}

const server = http.createServer((req, res) => {
    if (req.url == '/') {
            requests('https://api.openweathermap.org/data/2.5/weather?q=Agra&appid=4f618218fb946f13627606b4649eef9d')
            .on('data', (chunk) => {
                const objdata = JSON.parse(chunk);
                const arrData = [objdata];
                var reaTimeData = arrData.map( val => replaceVal ( homeData, val )).join("");
                console.log(reaTimeData);
                res.write(reaTimeData);
            })
            .on('end', (err) => {
                if (err) return console.error('connection failed', err);
                res.end();
            })

    }
});
server.listen(port, '127.0.0.1', () => {
    console.log('listening to port 3000');
});