Currency Converter App using HTML, CSS and JavaScript (Source Code) – Coding Torque

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Hello Coders! Welcome to Coding Torque. In this blog, we are going to create a Currency Converter App using HTML, CSS and JavaScript. We are going to use exchangerate-api to fetch currency rates and calculations, and also a flagcdn api to fetch flags of different countries. This is a real-world project so you must create this to upskill yourself in API fetching.

Before we start, here are some JavaScript Games you might like to create:

1. Snake Game using JavaScript

2. 2D Bouncing Ball Game using JavaScript

3. Rock Paper Scissor Game using JavaScript

4. Tic Tac Toe Game using JavaScript

5. Whack a Mole Game using JavaScript

I would recommend you don’t just copy and paste the code, just look at the code and type by understanding it.


HTML Code 

Starter Template

<!doctype html>
<html lang="en">

    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- CSS -->
    <link rel="stylesheet" href="style.css">

    <!-- FONT AWESOME CDN  -->
    <link rel="stylesheet" href=""
        crossorigin="anonymous" />

    <title>Currency Converter using JavaScript - @code.scientist x @codingtorque</title>

    <!-- Further Code Here -->

    <script src="script.js"></script>



Paste the below code in your <body> tag

<div class="wrapper">
    <h2>Currency Converter</h2>
    <form action="#">
        <div class="amount">
            <p>Enter Amount</p>
            <input type="text" value="1">
        <div class="drop-list">
            <div class="from">
                <div class="select-box">
                    <img src="" alt="flag">
                    <select> <!-- Options tag are inserted from JavaScript --> </select>
            <div class="icon"><i class="fas fa-exchange-alt"></i></div>
            <div class="to">
                <div class="select-box">
                    <img src="" alt="flag">
                    <select> <!-- Options tag are inserted from JavaScript --> </select>
        <div class="exchange-rate">Getting exchange rate...</div>
        <button>Get Exchange Rate</button>


Output Till Now

CSS Code 

Create a file style.css and paste the code below.

/* Import Google Font - Poppins */
@import url(";500;600;700&display=swap");

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Poppins", sans-serif;

body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 0 10px;
  background: #1a212d;

.wrapper {
  width: 30rem;
  padding: 30px;
  border-radius: 7px;
  background: #161922;
  color: white;
  box-shadow: 7px 7px 20px rgba(0, 0, 0, 0.05);

.wrapper h2 {
  font-size: 28px;
  font-weight: 500;
  text-align: center;

.wrapper form {
  margin: 40px 0 20px 0;

form :where(input, select, button) {
  width: 100%;
  outline: none;
  border-radius: 5px;
  border: none;

form p {
  font-size: 18px;
  margin-bottom: 5px;

form input {
  height: 50px;
  font-size: 17px;
  padding: 0 15px;
  background: transparent;
  color: white;
  border: 1px solid #999;

form input:focus {
  padding: 0 14px;
  border: 2px solid #675afe;

form .drop-list {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;

.from {
  width: 100%;

.to {
  width: 100%;

.drop-list .select-box {
  display: flex;
  width: 100%;
  height: 45px;
  align-items: center;
  border-radius: 5px;
  padding: 0 20px;
  border: 1px solid #999;
  background: #20232c;

.select-box img {
  max-width: 21px;

.select-box select {
  width: 100%;
  font-size: 16px;
  background: none;
  margin: 0 -5px 0 5px;
  color: white;
  background: #20232c;

.select-box select::-webkit-scrollbar {
  width: 8px;

.select-box select::-webkit-scrollbar-track {
  background: #fff;

.select-box select::-webkit-scrollbar-thumb {
  background: #888;
  border-radius: 8px;
  border-right: 2px solid #ffffff;

.drop-list .icon {
  cursor: pointer;
  margin-top: 10px;
  font-size: 22px;
  transform: rotate(90deg);

form .exchange-rate {
  font-size: 17px;
  margin: 20px 0 30px;

form button {
  height: 52px;
  color: #fff;
  font-size: 17px;
  cursor: pointer;
  background: #20232c;
  transition: 0.3s ease;

Output Till Now

Currency converter app using javascript with source code

JavaScript Code 

Create a file script.js and paste the code below.
Please Note: In the below javascript code we have the getExchangeRate() function that fetches the exchange rate which requires an API Key.
Your have to replace your API key in this URL ->${fromCurrency.value}
let country_list = {
    "AED": "AE",
    "AFN": "AF",
    "XCD": "AG",
    "ALL": "AL",
    "AMD": "AM",
    "ANG": "AN",
    "AOA": "AO",
    "AQD": "AQ",
    "ARS": "AR",
    "AUD": "AU",
    "AZN": "AZ",
    "BAM": "BA",
    "BBD": "BB",
    "BDT": "BD",
    "XOF": "BE",
    "BGN": "BG",
    "BHD": "BH",
    "BIF": "BI",
    "BMD": "BM",
    "BND": "BN",
    "BOB": "BO",
    "BRL": "BR",
    "BSD": "BS",
    "NOK": "BV",
    "BWP": "BW",
    "BYR": "BY",
    "BZD": "BZ",
    "CAD": "CA",
    "CDF": "CD",
    "XAF": "CF",
    "CHF": "CH",
    "CLP": "CL",
    "CNY": "CN",
    "COP": "CO",
    "CRC": "CR",
    "CUP": "CU",
    "CVE": "CV",
    "CYP": "CY",
    "CZK": "CZ",
    "DJF": "DJ",
    "DKK": "DK",
    "DOP": "DO",
    "DZD": "DZ",
    "ECS": "EC",
    "EEK": "EE",
    "EGP": "EG",
    "ETB": "ET",
    "EUR": "FR",
    "FJD": "FJ",
    "FKP": "FK",
    "GBP": "GB",
    "GEL": "GE",
    "GGP": "GG",
    "GHS": "GH",
    "GIP": "GI",
    "GMD": "GM",
    "GNF": "GN",
    "GTQ": "GT",
    "GYD": "GY",
    "HKD": "HK",
    "HNL": "HN",
    "HRK": "HR",
    "HTG": "HT",
    "HUF": "HU",
    "IDR": "ID",
    "ILS": "IL",
    "INR": "IN",
    "IQD": "IQ",
    "IRR": "IR",
    "ISK": "IS",
    "JMD": "JM",
    "JOD": "JO",
    "JPY": "JP",
    "KES": "KE",
    "KGS": "KG",
    "KHR": "KH",
    "KMF": "KM",
    "KPW": "KP",
    "KRW": "KR",
    "KWD": "KW",
    "KYD": "KY",
    "KZT": "KZ",
    "LAK": "LA",
    "LBP": "LB",
    "LKR": "LK",
    "LRD": "LR",
    "LSL": "LS",
    "LTL": "LT",
    "LVL": "LV",
    "LYD": "LY",
    "MAD": "MA",
    "MDL": "MD",
    "MGA": "MG",
    "MKD": "MK",
    "MMK": "MM",
    "MNT": "MN",
    "MOP": "MO",
    "MRO": "MR",
    "MTL": "MT",
    "MUR": "MU",
    "MVR": "MV",
    "MWK": "MW",
    "MXN": "MX",
    "MYR": "MY",
    "MZN": "MZ",
    "NAD": "NA",
    "XPF": "NC",
    "NGN": "NG",
    "NIO": "NI",
    "NPR": "NP",
    "NZD": "NZ",
    "OMR": "OM",
    "PAB": "PA",
    "PEN": "PE",
    "PGK": "PG",
    "PHP": "PH",
    "PKR": "PK",
    "PLN": "PL",
    "PYG": "PY",
    "QAR": "QA",
    "RON": "RO",
    "RSD": "RS",
    "RUB": "RU",
    "RWF": "RW",
    "SAR": "SA",
    "SBD": "SB",
    "SCR": "SC",
    "SDG": "SD",
    "SEK": "SE",
    "SGD": "SG",
    "SKK": "SK",
    "SLL": "SL",
    "SOS": "SO",
    "SRD": "SR",
    "STD": "ST",
    "SVC": "SV",
    "SYP": "SY",
    "SZL": "SZ",
    "THB": "TH",
    "TJS": "TJ",
    "TMT": "TM",
    "TND": "TN",
    "TOP": "TO",
    "TRY": "TR",
    "TTD": "TT",
    "TWD": "TW",
    "TZS": "TZ",
    "UAH": "UA",
    "UGX": "UG",
    "USD": "US",
    "UYU": "UY",
    "UZS": "UZ",
    "VEF": "VE",
    "VND": "VN",
    "VUV": "VU",
    "YER": "YE",
    "ZAR": "ZA",
    "ZMK": "ZM",
    "ZWD": "ZW"

const dropList = document.querySelectorAll("form select"),
    fromCurrency = document.querySelector(".from select"),
    toCurrency = document.querySelector(".to select"),
    getButton = document.querySelector("form button");

for (let i = 0; i < dropList.length; i++) {
    for (let currency_code in country_list) {
        let selected = i == 0 ? currency_code == "USD" ? "selected" : "" : currency_code == "INR" ? "selected" : "";

        let optionTag = `<option value="${currency_code}" ${selected}>${currency_code}</option>`;
        dropList[i].insertAdjacentHTML("beforeend", optionTag);
    dropList[i].addEventListener("change", e => {

function loadFlag(element) {
    for (let code in country_list) {
        if (code == element.value) {
            let imgTag = element.parentElement.querySelector("img");
            imgTag.src = `${country_list[code].toLowerCase()}.png`;

window.addEventListener("load", () => {

getButton.addEventListener("click", e => {

const exchangeIcon = document.querySelector("form .icon");
exchangeIcon.addEventListener("click", () => {
    let tempCode = fromCurrency.value;
    fromCurrency.value = toCurrency.value;
    toCurrency.value = tempCode;

function getExchangeRate() {
    const amount = document.querySelector("form input");
    const exchangeRateTxt = document.querySelector("form .exchange-rate");
    let amountVal = amount.value;
    if (amountVal == "" || amountVal == "0") {
        amount.value = "1";
        amountVal = 1;
    exchangeRateTxt.innerText = "Getting exchange rate...";
    let url = `${fromCurrency.value}`;
    fetch(url).then(response => response.json()).then(result => {
        let exchangeRate = result.conversion_rates[toCurrency.value];
        let totalExRate = (amountVal * exchangeRate).toFixed(2);
        exchangeRateTxt.innerText = `${amountVal} ${fromCurrency.value} = ${totalExRate} ${toCurrency.value}`;
    }).catch(() => {
        exchangeRateTxt.innerText = "Something went wrong";


Written by: Piyush Patil
If you have any doubts or any project ideas feel free to Contact Us
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