index.js

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


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 crypto = req.body.crypto;
    var fiat = req.body.fiat;
    var amount = req.body.amount;

    var options = {
        url: "https://apiv2.bitcoinaverage.com/convert/global",
        method: "GET",
        qs: {
            from: crypto,
            to: fiat,
            amount: amount
        }
    }

    request(options, function(error, response, body){
        
        var data = JSON.parse(body);
        var price = data.price;

        res.write("Date and time : "+ data.time);
        res.write("<h1>The price of the "+crypto+ " is " +price+ fiat +"</h1>");
        
        res.send();
    });
    

});


app.listen(3000, function(){
    console.log("i am port 3000 i am ready to go...");
});