These days, most web applications require real-time currency rate data. This helps users make educated decisions. Currency exchange rates are essential, and it can be a Svelte currency converter, a financial dashboard, or an e-commerce site. They must be specific, current, and supported with reliable historical exchange rate statistics.
Combining exchange rate APIs can be complicated for beginners, especially when dealing with hundreds of API requests. But not with Svelte. Svelte is a reactive framework with components that are efficient JavaScript at build time. This makes it fast and easy to use in apps (such as currency converters) at build time.
In this blog, we will show how to combine the CurrencyFreaks API with Svelte JS, handling both real-time and historical exchange rate data. The procedure will include getting the API key and creating a working currency converter.
You can also explore our guide on using a currency rates API with Python for backend integration.
How Do You Create a Svelte Currency Converter Using CurrencyFreaks API?
Follow the steps given below to create a Svelte currency converter:
Get the API Key
You should create an account with CurrencyFreaks. Next, you should log in to that account to get your API request key.
Choose the Desired Endpoint
CurrencyFreaks offers multiple endpoints for fetching the currency data. You can explore it through the CurrencyFreaks documentation. It is important to study those API endpoints before integrating them. It will help you choose which endpoint suits your project the most.
In this guide, we will choose the current currency exchange rates endpoint given below:
https://api.currencyfreaks.com/v2.0/rates/latest?apikey=YOUR_APIKEY
Here is the example response:
{
"date": "2023-03-21 12:43:00+00",
"base": "USD",
"rates": {
"AGLD": "2.3263929277654998",
"FJD": "2.21592",
"MXN": "18.670707655673546",
"LVL": "0.651918",
"SCR": "13.21713243157135",
"CDF": "2068.490771",
"BBD": "2.0",
"HNL": "24.57644632001569",
.
.
.
}
}
Build Your App
Step 1: Launch a Svelte project
If you don't already have Svelte installed, start by creating a Svelte project. Install Node.js (if necessary). Execute the commands needed in your terminal to set up and run a basic Svelte project on your machine locally.
npx degit sveltejs/template currency-widget
cd currency-widget
npm install
npm run dev
This will set up a basic Svelte project and run it locally on your machine.
Step 2: Create a CurrencyWidget.svelte File
Within your project directory, create a Svelte component named CurrencyWidget.svelte and place it.
<script lang="ts">
import { onMount } from "svelte";
let fromCurrency: string = "USD";
let toCurrency: string = "EUR";
let amount: number = 1;
let result: string = "";
let currencies: string[] = [];
const API_KEY: string = 'add-your-api-key'; // Replace with your API key
onMount(async () => {
try {
const response = await fetch(`https://api.currencyfreaks.com/v2.0/rates/latest?apikey=${API_KEY}`);
const data = await response.json();
currencies = Object.keys(data.rates);
updateResult();
} catch (error) {
console.error("Failed to fetch rates:", error);
result = "Conversion failed. Please try again.";
}
});
async function updateResult() {
try {
const response = await fetch(`https://api.currencyfreaks.com/v2.0/rates/latest?apikey=${API_KEY}&base=${fromCurrency}&symbols=${toCurrency}`);
const data = await response.json();
const rate: number = data.rates[toCurrency];
const convertedAmount: string = (amount * rate).toFixed(2);
result = `${amount} ${fromCurrency} = ${convertedAmount} ${toCurrency}`;
} catch (error) {
console.error("Conversion failed:", error);
result = "Conversion failed. Please try again.";
}
}
</script>
<style>
/* Widget container */
#currency-widget {
width: 450px;
padding: 40px;
border-radius: 20px;
background-color: #f0f4f8;
box-shadow: 0 15px 30px rgba(0, 0, 0, 0.1);
text-align: center;
margin: 0 auto;
margin-top: 10%;
position: relative;
top: 20%;
transform: translateY(-20%);
background: linear-gradient(135deg, #f0f4f8, #e2e8f0);
background-size: cover;
background-position: center;
background-repeat: no-repeat;
}
/* Modernized heading */
h2 {
margin-top: 20%;
font-size: 2em;
font-weight: 700;
color: #333;
margin-bottom: 20px;
letter-spacing: 0.05em;
}
label {
font-size: 1.1em;
font-weight: 600;
color: #555;
margin-bottom: 10px;
display: block;
text-align: left;
}
/* Smooth and rounded input styles */
select, input {
width: 80%;
padding: 14px;
margin-bottom: 20px;
border: none;
border-radius: 12px;
font-size: 1em;
background-color: #ffffff;
box-shadow: 0 5px 10px rgba(0, 0, 0, 0.05);
color: #333;
}
/* Focus effect for better user experience */
select:focus, input:focus {
outline: none;
box-shadow: 0 0 10px rgba(33, 147, 176, 0.3);
}
/* Stylish result display */
#result {
font-size: 1.4em;
font-weight: bold;
color: #333;
margin-top: 20px;
background-color: #edf7fa;
padding: 15px;
border-radius: 12px;
border: 1px solid #ddd;
}
/* Redesigned button for a fresh look */
button {
width: 100%;
padding: 15px;
background-color: #b02185;
border: none;
border-radius: 12px;
color: white;
font-size: 1.2em;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease, transform 0.2s ease;
}
/* Button hover effect */
button:hover {
background-color: #6d82ed;
transform: translateY(-3px);
}
button:active {
transform: translateY(0);
}
</style>
<div id="currency-widget">
<h2>Simple Currency Converter App</h2>
<label for="fromCurrency">From Currency</label>
<select id="fromCurrency" bind:value={fromCurrency}>
{#each currencies as currency}
<option value={currency}>{currency}</option>
{/each}
</select>
<label for="toCurrency">To Currency</label>
<select id="toCurrency" bind:value={toCurrency}>
{#each currencies as currency}
<option value={currency}>{currency}</option>
{/each}
</select>
<label for="amount">Amount</label>
<input type="number" id="amount" bind:value={amount} min="1">
<div id="result">{result}</div>
<button on:click={updateResult}>Convert</button>
</div>
Real-time currency conversion rates come from CurrencyFreaks API. Selected currencies, amounts, and results are stored as Svelte reactive variables; the onMount function accesses all available currencies and fills drop-down menus so users can select "From" and "To" currencies, respectively.
Step 3: Modify App.svelte Code
Inside your App.svelte file, paste the following code:
<script>
import CurrencyWidget from './CurrencyWidget.svelte';
</script>
<main>
<CurrencyWidget />
</main>
This code imports the CurrencyWidget Svelte component. The Svelte component is located in the CurrencyWidget.svelte file. Inside the <main> block, it uses this widget. The CurrencyWidget is then displayed on the page. This allows the parent component to show the widget and its functionality.
Step 4: Running the project
Now, run the following command to start the development server:
npm run dev
Visit http://localhost:5173 in your browser to see the currency exchange widget working with Svelte.
Step 5: Test the App
When you start the development server, you should see the screen given below:
Enter the desired currencies and see the amount converted above the “Convert” button. You can select the currencies through the drop-down menu as shown below:
Building the Currency Converter with SvelteKit
Most of the new Svelte applications are developed with SvelteKit, although the Svelte component works standalone. SvelteKit provides routing and server-side rendering with better performance. This is how you can integrate CurrencyFreaks API in a SvelteKit app:
// src/routes/+page.svelte
<script lang="ts">
import { onMount } from 'svelte';
import { writable, get } from 'svelte/store';
export let data: any;
const rates = writable({});
const fromCurrency = writable('USD');
const toCurrency = writable('EUR');
const amount = writable(1);
const result = writable('');
onMount(() => {
rates.set(data.rates);
updateResult();
});
async function updateResult() {
const $from = get(fromCurrency);
const $to = get(toCurrency);
const $amount = get(amount);
const rate = get(rates)[$to];
result.set(`${$amount} ${$from} = ${(rate * $amount).toFixed(2)} ${$to}`);
}
</script>
Server Load Example (SvelteKit Endpoint)
// src/routes/api/rates/+server.ts
import type { RequestHandler } from './$types';
export const GET: RequestHandler = async () => {
const API_KEY = 'add-your-api-key';
const res = await fetch(`https://api.currencyfreaks.com/v2.0/rates/latest?apikey=${API_KEY}`);
const data = await res.json();
return new Response(JSON.stringify(data));
};
When fetching rates on the server-side using SvelteKit, your app loads more quickly. It does not make the API key visible in the browser. This is a SvelteKit-only solution. It ensures your currency converter app is production-ready and fully optimized.
Why Should You Choose Svelte JS with CurrencyFreaks Currency Exchange Rates API?
CurrencyFreaks API + Svelte.js is an excellent alternative to make a responsive web application for converting currency in real time and with high precision.
- Svelte is a minimalistic JavaScript framework. It minimizes code during compilation that ensures apps run faster. As a result, it improves user experience and reduces the load times. This is true particularly when there are multiple API requests to update exchange rates.
- CurrencyFreaks API provides accurate exchange rates for 1000 currencies. 160 fiat currencies are provided by the CurrencyFreaks API, as well as by credible sources like the European Central Bank. This will ensure that your users are presented with up-to-date, reliable information.
- This simple-to-integrate API can be easily integrated with Svelte. Intuitive architecture of Svelte makes it easier to integrate APIs. It saves development time and effort. Your app will show the real-time currency exchange rate easily. It will allow a user to carry out currency conversion immediately.
- CurrencyFreaks has custom options to provide developers with the information needed to create their own pricing depending on their use of the API. The combination of Svelte and CurrencyFreaks helps produce a high-performance currency converter in Svelte. The updates for the converter are smooth, enabling the performance of the converters to be reliable.
Conclusion
You can easily implement the CurrencyFreaks API with Svelte JS to create a real-time Svelte currency converter. Svelte enables fast, easy application development. It also reduces the code needed to load the app. CurrencyFreaks gives the recent exchange rates for over 1,000 currencies, which include 160+ fiat currencies. It gives the most accurate currency exchange rates.
Setting up a working Svelte currency converter takes just a few steps. This combination makes your app responsive and convenient for users. With Svelte and CurrencyFreaks, you can always deliver fast, accurate, real-time currency data.
👉Looking for the 10 best currency exchange APIs? Explore now.
FAQs
How To Build A Svelte Exchange Rate App?
A Svelte exchange rate app can be made by developing a component that fetches currency rates via an API such as CurrencyFreaks. Interpret reactive variables to make real-time updates to conversions. The ease of programming and lack of overhead in Svelte achieve this. It makes it easy to utilize and respond to user input in real-time. This gives the impression of instant feedback.
SvelteKit API Integration Tutorial For Currency Conversion
In SvelteKit, APIs can be integrated client-side (onMount) or server-side (endpoints). Server-side fetching not only ensures your API key is safe but also enhances performance. Mix Svelte stores with a reactive variable to show live currency conversion output in an efficient manner.
How To Display Real-Time Currency Rates In Svelte?
Use Svelte stores to store API response data and reactive variables to calculate conversions dynamically. CurrencyFreaks fetches rates and updates the UI automatically when users choose alternative currencies or enter quantities. This will provide real-time updates of information with no manual refreshing.
Best Practices For Building Svelte Currency Converters
In SvelteKit, it is best to always fetch sensitive API data on the server to keep your API key. Be modular with reusable components, and gracefully cope with errors to enhance user experience. CSS gradient and smooth input styles make it easier to use. At the same time, they allow simplifying the appearance of the app.
Sign up for free at CurrencyFreaks to fetch real-time currency rates.
