Introduction to Environment Variables

Environment variables are used to store sensitive data, such as API keys and database credentials.

Step 1: Create a New Next.js Project

Create a new Next.js project using npx create-next-app my-env.

npx create-next-app my-env
cd my-env

Step 2: Create a .env File

Create a new file called .env in the root of your project.

# .env
API_KEY=YOUR_API_KEY

Step 3: Use Environment Variables in Your Code

Use the environment variables in your code.

// pages/index.js
import { useState, useEffect } from 'react';

const Home = () => {
  const [data, setData] = useState([]);
  const apiKey = process.env.API_KEY;

useEffect(() => {
    fetch(`https://api.example.com/data?api_key=${apiKey}`)
      .then((response) => response.json())
      .then((data) => setData(data));
  }, [apiKey]);

return (
    <div>
      {data.map((item) => (
        <div key={item.id}>{item.name}</div>
      ))}
    </div>
  );
};

export default Home;

Conclusion

In this tutorial, you learned how to use environment variables in Next.js to store sensitive data.