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){

    const query = req.body.cityName
    const apiKey = "a494070c4a45f6d5afd06cf3460a01e1"
    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)

        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= "http://openweathermap.org/img/wn/" + icon + "@2x.png"
            res.write("<h1>The temperature in " + query + " is " + temp + "degree  Celcius</h1>")
            res.write("<img src="+ imageURL +">")
            res.send()
        })



    })

})


//res.send("Server is running")

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