app.js

const express=require("express");
const https=require("https");
const bodyParser=require("body-parser");

const app=express();

app.use(express.static("public"));
app.use(bodyParser.urlencoded({extended:true}));

app.get("/",function(req,res){
	res.sendfile(__dirname+"/index.html");
});

app.post("/",function(req,res){
	const query=req.body.cityName;
	const apiKey="439d63e66521cea07a1bc281fd565c12";
	const unit="metric";
	const url="https://api.openweathermap.org/data/2.5/weather?q="+query+"&appid="+apiKey+"&units="+unit;
	https.get(url,function(response){
		console.log(response.statusCode);
		response.on("data",function(data){
			const weatherData=JSON.parse(data);
			const temp=weatherData.main.temp;
			const weatherDescription=weatherData.weather[0].description;
			const icon=weatherData.weather[0].icon;
			const imageURL="https://openweathermap.org/img/wn/"+icon+"@2x.png";
			res.write("<p>The weather is currently "+weatherDescription+".</p>");
			res.write("<h1>The Temprature in "+query+" is : "+temp+" degrees Celcius.</h1>");
			res.write("<img src=" +imageURL+">");
			res.send();
		});
	});
});

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