Build a Cryptocurrency Web App Using React or Next.js

This content originally appeared on DEV Community and was authored by Raj Aryan

Want to build your own crypto tracker or DApp? Here’s your beginner-friendly guide to creating a fast, modern cryptocurrency website using React.js or Next.js—complete with real APIs, UI examples, and deployment tips.

Why Use React or Next.js for Crypto Apps?

React.js and Next.js are ideal for cryptocurrency projects because:

• Fast rendering (great for real-time prices)
• SEO-friendly (especially with Next.js)
• Easy to connect with crypto APIs (like CoinGecko, CoinMarketCap)
• Mobile-ready UI frameworks like Tailwind or Material UI

Approach Overview

1. Pick a framework: React (client-side) or Next.js (with SSR/SSG)
2. Choose a data provider: Free crypto API like CoinGecko or CoinMarketCap
3. Build components: Coins list, live price chart, converter, wallet integration
4. Style UI: Tailwind, Chakra, or custom CSS
5. Deploy: Vercel (Next.js) or Netlify (React)

Step-by-Step Example: Build a Crypto Price Tracker

1⃣ Setup Project

React

npx create-react-app crypto-tracker
cd crypto-tracker

Next.js

npx create-next-app@latest crypto-tracker
cd crypto-tracker

2⃣ Fetch Real-Time Prices with CoinGecko API

// pages/index.js (or App.jsx for React)
import { useEffect, useState } from 'react';

export default function Home() {
  const [coins, setCoins] = useState([]);

  useEffect(() => {
    fetch("https://api.coingecko.com/api/v3/coins/markets?vs_currency=usd")
      .then(res => res.json())
      .then(data => setCoins(data));
  }, []);

  return (
    <div>
      <h1>Top Cryptocurrencies</h1>
      <ul>
        {coins.map(coin => (
          <li key={coin.id}>
            <img src={coin.image} alt={coin.name} width="20" />
            {coin.name}: ${coin.current_price}
          </li>
        ))}
      </ul>
    </div>
  );
}

3⃣ Add Search Functionality

<input
  type="text"
  placeholder="Search by name"
  onChange={(e) =>
    setCoins(prev =>
      prev.filter((coin) =>
        coin.name.toLowerCase().includes(e.target.value.toLowerCase())
      )
    )
  }
/>

4⃣ Optional: Add Chart with Chart.js or Recharts

npm install chart.js react-chartjs-2

Then create a chart for selected coin using its historical data.

5⃣ Deploy on Vercel (for Next.js) or Netlify

# For Next.js
npx vercel

Bonus Features You Can Add

• Wallet Connect (using MetaMask + Web3.js or ethers.js)
• Crypto converter
• Dark mode
• Currency switcher (USD, INR, BTC)
• News integration (e.g., CryptoPanic API)

Pro Tips for Going Viral

• Use getServerSideProps in Next.js to boost SEO
• Optimize images using next/image
• Add social sharing with Open Graph metadata
• Deploy a custom domain (like cryptotracker.me)

Conclusion

Building a cryptocurrency app with React or Next.js is not just possible—it’s practical, fast, and highly scalable. Whether you’re tracking prices or building a blockchain dashboard, this is a lucrative niche with high earning potential.

This content originally appeared on DEV Community and was authored by Raj Aryan