app.js

const express = require("express");
const https = require("https"); 
const bodyParser = require("body-parser"); 
const app = express();
app.use(bodyParser.urlencoded({extended: true}));
app.get("/", function(req, res){
    res.sendFile(__dirname + "/index.html");
});

app.post("/",function(req,res){
    var cityName = req.body.cityName;
    const apiKey = process.env.SECRET;
    const unit = "metric"
    const url = "https://api.openweathermap.org/data/2.5/weather?q="+cityName+"&appid="+apiKey+"&units="+unit
    https.get(url, function(response){
        console.log(response.statusCode);
        response.on("data", function(data){
            const weatherData = JSON.parse(data);
            // console.log(weatherData);
            const temp = weatherData.main.temp;
            // console.log(temp);
            const des = weatherData.weather[0].description;
            const icon = weatherData.weather[0].icon;
            const imgurl = "https://openweathermap.org/img/wn/"+icon+"@2x.png";
            console.log(imgurl);
            res.write("<h1>The temperature in "+cityName+" is "+temp+" degrees Celsius</h1>");
            res.write("<p>The weather condition in "+cityName+" is "+des+"</p>");
            res.write("<img src="+imgurl+">");
            res.send();
        })
    })
    // res.send("Server is up and running");
})

app.listen(3000, function(){
    console.log("Server running on port 3000");
})