Have you ever wondered how to build a currency converter in React using real-time exchange rates? In modern web applications, accurate currency data is essential for developers building financial tools, e-commerce platforms, or global apps. This tutorial shows you how to integrate the CurrencyFreaks API into a React application using simple and practical steps.
You’ll learn how to set up a currency converter React app project, use hooks like useState and useEffect to fetch exchange rates, and display the data inside a functional React component. By the end, you will have a working currency converter in React that updates dynamically with live data.
If you are exploring similar implementations in other languages, you can also check our Python-based currency converter integration guide.
CurrencyFreaks Integration with React JS
We have made it very simple for developers. We outlined some simple steps to help you integrate the CurrencyFreaks API into a React application.
The best part? Follow these steps to display the output on your PC. The API is designed to work efficiently with React components and dynamic data rendering, making it easy for developers to integrate CurrencyFreaks with React JS. Let’s not wait any further and move on to the next steps:
Creating an Account
To get started, sign up at CurrencyFreaks and generate your API key from the dashboard.
👉 Looking for more options? Check out our guide on the 10 Best Currency Exchange APIs to compare features and find the right API for your project.
Testing the API Key
You should create a new GET request in Postman. Next, you should enter the URL below into the request bar.
https://api.currencyfreaks.com/v2.0/rates/latest?apikey=YOUR_APIKEY
If it shows a JSON response, it means our API key is working fine.
Set Up the React Currency Converter Project
First, make sure you have Node.js installed, then set up a new React project using Create React App.
npx create-react-app currency-converter
cd currency-converter
npm install axios react-select
We use react-select because it provides a searchable, accessible, and user-friendly dropdown out of the box, unlike a native <select> which requires extra work for search and better UX handling.
Building a Currency Converter React Component with Hooks
Create the CurrencyConverter Component
Create a new file named CurrencyConverter.js in the src directory.
// src/CurrencyConverter.js
import React, { useState, useEffect } from 'react';
import Select from 'react-select';
import './CurrencyConverter.css';
import useCurrencyConverter from './useCurrencyConverter';
const CurrencyConverter = () => {
const [amount, setAmount] = useState(1);
const [fromCurrency, setFromCurrency] = useState({ label: 'USD', value: 'USD' });
const [toCurrency, setToCurrency] = useState({ label: 'EUR', value: 'EUR' });
const apiKey = 'YOUR_APIKEY';
// ✅ USE CUSTOM HOOK
const { rates, loading, error } = useCurrencyConverter(apiKey, fromCurrency.value);
const [exchangeRate, setExchangeRate] = useState(null);
const [currencyOptions, setCurrencyOptions] = useState([]);
// ✅ Build options + rate from hook data
useEffect(() => {
if (rates && Object.keys(rates).length > 0) {
const options = Object.keys(rates).map(currency => ({
label: currency,
value: currency
}));
setCurrencyOptions(options);
const rate = rates[toCurrency.value];
setExchangeRate(rate ? parseFloat(rate) : null);
}
}, [rates, toCurrency]);
const handleAmountChange = (e) => {setAmount(parseFloat(e.target.value) || 0);
};
const handleFromCurrencyChange = (selectedOption) => {
setFromCurrency(selectedOption);
};
const handleToCurrencyChange = (selectedOption) => {
setToCurrency(selectedOption);
};
const convertCurrency = () => {
if (loading) return 'Fetching latest rates...';
if (exchangeRate !== null) return (amount * exchangeRate).toFixed(2);
return 'N/A';
};
return (
<div className="currency-converter">
<h1>Currency Converter</h1>
{/* ✅ Proper error handling */}
{error && <p className="error-message">{error}</p>}
<div className="converter-inputs">
<input
type="number"
value={amount}
onChange={handleAmountChange}
className="amount-input"
/>
<Select
value={fromCurrency}
onChange={handleFromCurrencyChange}
options={currencyOptions}
className="currency-select"
/>
<span>to</span>
<Select
value={toCurrency}
onChange={handleToCurrencyChange}
options={currencyOptions}
className="currency-select"
/>
</div>
<h2>
{amount} {fromCurrency.value} is equal to {convertCurrency()} {toCurrency.value}
</h2>
</div>
);
};
export default CurrencyConverter;
Creating a Reusable useCurrencyConverter Hook
To make your React application more modular and reusable, you can extract the currency fetching logic into a custom hook. This approach keeps your components clean and allows you to reuse the logic across multiple components.
Create a new file named useCurrencyConverter.js inside the src directory:
// src/useCurrencyConverter.js
import { useState, useEffect } from 'react';
import axios from 'axios';
const useCurrencyConverter = (apiKey, baseCurrency) => {
const [rates, setRates] = useState({});
const [loading, setLoading] = useState(true);
const [error, setError] = useState(null);
useEffect(() => {
if (!apiKey || !baseCurrency) return;
setLoading(true);
axios
.get(
`https://api.currencyfreaks.com/v2.0/rates/latest?apikey=${apiKey}&base=${baseCurrency}`
)
.then(response => {
setRates(response.data.rates);
setError(null);
})
.catch(error => {
console.error(`Error fetching the rates: ${error}`);
setError('Failed to fetch exchange rates. Please try again.');
})
.finally(() => {
setLoading(false);
});
}, [apiKey, baseCurrency]);
return { rates, loading, error };
};
export default useCurrencyConverter;
You can now use this hook inside your React components to fetch and manage exchange rate data more efficiently.
Create a CSS File for Styling
Create a new CSS file named CurrencyConverter.css in the src directory.
/* src/CurrencyConverter.css */
.currency-converter {
text-align: center;
padding: 20px;
}
.converter-inputs {
display: flex;
justify-content: center;
align-items: center;
gap: 10px;
margin-bottom: 20px;
}
.amount-input {
width: 200px;
padding: 10px;
font-size: 1.2em;
border: 1px solid #ccc;
border-radius: 4px;
}
.currency-select {
width: 150px;
}
Integrate the Component into the App
Modify App.js to include the CurrencyConverter component.
// src/App.js
import React from 'react';
import './App.css';
import CurrencyConverter from './CurrencyConverter';
function App() {
return (
<div className="App">
<header className="App-header">
<h1>React Currency Converter</h1>
<CurrencyConverter />
</header>
</div>
);
}
export default App;
Start the React Application
Run your application by executing:
npm start
Output
What Are the Benefits of Integrating CurrencyFreaks with React JS?
Integrating the CurrencyFreaks API with React.js offers many benefits that can improve your web app. Here are some of the main advantages:
Have you ever wondered how to easily add real-time currency exchange rates to your web app? In today's global economy, accurate currency information is crucial for businesses and developers. This tutorial will show you how to integrate CurrencyFreaks API with React JS, utilizing a Free Currency Converter API. You'll learn about the benefits and follow simple steps to make your app more robust.
First, we will discuss why you should integrate CurrencyFreaks with React JS. Next, we'll guide you through the steps to achieve this integration. You'll start by creating an account on CurrencyFreaks. Then, you'll get an API key, which is essential for accessing currency data. We'll show you how to test this key to ensure it works.
After that, you'll set up your React JS environment, write the code to integrate the API and display the data in your app. Let's begin.
What Are the Benefits of Integrating CurrencyFreaks with React JS?
Integrating CurrencyFreaks API with React JS has many benefits that can improve your web app. Here are some of the main advantages:
A primary benefit of integrating the CurrencyFreaks API with React.js is the ability to display real-time exchange rates with high accuracy and minimal effort. This is critical for applications that require real-time currency data, such as financial applications and e-commerce for global markets.
The combination of React’s real-time API data and dynamic rendering delivers a highly responsive, seamless user experience. Users can easily interact with the app, and the interface updates in real time, eliminating the need for manual refreshing or calculations, making the entire experience fast and highly intuitive.
This integration can simplify the application's design and reduce its complexity in the future. Whether it’s a simple currency converter or a complex financial dashboard, combining React and CurrencyFreaks will automate manual updates and allow the application to scale with data needs.
Conclusion
Combining React JS with the CurrencyFreaks API is a reliable way to add real-time exchange rates to your React application. This tutorial shows you how to use the CurrencyFreaks API plus React to build an interactive, user-friendly currency converter.
Simple steps enabled you to set up a React environment, fetch and render currency data, and make it look better for users’ convenience. This makes your React exchange rate app more useful while providing real-time currency conversion for global transactions.
FAQs
What is the CurrencyFreaks API, and Why Should You Use It In a React JS Application?
The CurrencyFreaks API provides up-to-date and historical currency exchange rates for applications that handle current currency data. ReactJS easily integrates with the API, providing developers with confidence in its reliability.
How Can I Store Securely My CurrencyFreaks API Key In A React Application?
The best way to securely store your Free React Currency Converter API key is through environment variables. Go ahead and create a .env file at the root of your React project, then add REACT_APP_API_KEY=YOUR_API_KEY. In your code, this would be accessed as process.env.REACT_APP_API_KEY. This is the recommended approach for securing API keys in React applications.
What Are The Most Common Issues That May Arise When Integrating With The CurrencyFreaks API, And How Can I Handle Them In a React App?
Common issues include incorrect API keys, network errors, and handling API rate limits. Confirm that you are using the correct API key, check if you are connected to the internet, and implement proper error handling in your React application.
Can I Use the CurrencyFreaks API in My React App to Fetch Historical Exchange Rates?
Yes, but note that the CurrencyFreaks API has endpoints specifically designed to access historical exchange rates. You can request an API endpoint that retrieves historical data, specifying the required date as a parameter or a path parameter. Explore all endpoints inside the CurrencyFreaks API documentation.
What are the best ways to improve the performance of my React app, which uses the CurrencyFreaks API in a React app for frequent API calls?
Avoid unnecessary API calls to minimize performance issues. Techniques such as user input debouncing, response caching, and efficient state management can be applied to reduce the number of API requests.
Is This A Complete Currency API React JS Tutorial For Beginners?
Yes. This tutorial provides a comprehensive starting point for beginners, covering React setup, API integration, hook usage, and building a functional currency converter with real-time exchange rates.
Sign up for free at CurrencyFreaks and get your API key to build a React application.
