Understanding .module.css in Next.js

In Next.js, using the .module.css suffix for CSS files enables the CSS Modules feature. CSS Modules allow us to scope styles locally, preventing global naming conflicts. This means that the styles for each component are independent and only effective within that component, enhancing the maintainability and readability of the code.

Benefits of CSS Modules

• Scoped Styles: Each class name is automatically generated with a unique identifier, ensuring that styles do not conflict between different components. This allows developers to name styles more freely without worrying about affecting other components.

• Example: If we define a class named button in one component and another class with the same name in a different component, using CSS Modules will compile these class names into different identifiers, ensuring that their styles do not interfere with each other.

By adopting CSS Modules, developers can create more modular and maintainable styles in their Next.js applications.

e.g.

/* Button.module.css */
.button {
  background-color: blue;
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
}

// components/Button.jsx
import styles from './Button.module.css';

export default function Button({ children, onClick }) {
  return (
    <button className={styles.button} onClick={onClick}>
      {children}
    </button>
  );
}

In this example, the Button component uses the styles.button class from the Button.module.css file. The class name styles.button is automatically generated by CSS Modules, ensuring that it is unique and does not conflict with other components.

This approach helps in creating more modular and maintainable styles in Next.js applications.