NextJS Role-Based Access Control

Syntax

...
export const getServerSideProps = withSession(async function ({ req, res }) {
  const user = req.session.get('user');
  if (!user) {
    return {
      redirect: {
        destination: '/login',
        permanent: false,
      },
    };
  }

  const { role } = user;
  if (role !== 'admin') {
    return {
      redirect: {
        destination: '/',
        permanent: false,
      },
    };
  }

  return {
    props: { user },
  };
});
...

Example

import withSession from '../../lib/session';

const AdminDashboard = ({ user }) => {
  return (
    <div>
      <h1>Welcome {user.username}!</h1>
      <p>You are currently logged in with an admin account.</p>
    </div>
  );
};

export const getServerSideProps = withSession(async function ({ req, res }) {
  const user = req.session.get('user');
  if (!user) {
    return {
      redirect: {
        destination: '/login',
        permanent: false,
      },
    };
  }

  const { role } = user;
  if (role !== 'admin') {
    return {
      redirect: {
        destination: '/',
        permanent: false,
      },
    };
  }

  return {
    props: { user },
  };
});

export default AdminDashboard;

Output

The output of the above example will be the logged-in user's username and a message that they are currently logged in with an admin account.

Explanation

NextJS Role-Based Access Control is used to restrict access to certain pages or components of a NextJS application based on the role of the logged-in user. This can be achieved using the getServerSideProps function provided by NextJS.

In this example, a user's role is checked against the role of an admin. If the user has the admin role, they are allowed to access the admin dashboard. If not, they are redirected to the home page.

The withSession function is used to ensure that a user is authenticated and has a valid session before attempting to access the restricted page.

Use

NextJS Role-Based Access Control can be used to restrict access to any page or component of a NextJS application based on the user's role or other permissions. This can be particularly useful in applications where certain features or data should only be accessible to certain users, such as admin features, premium content, or sensitive data.

Important Points

• Always ensure that a user is authenticated and has a valid session before attempting to restrict access to a page or component.
• Use the getServerSideProps function to check a user's role or other permissions and redirect or render the appropriate component based on the results.
• Always test the role-based access control feature thoroughly to ensure that it is working as expected.

Summary

NextJS Role-Based Access Control is a powerful tool for controlling access to certain pages or components of a NextJS application based on the role of the logged-in user. By using the getServerSideProps function and checking a user's role or other permissions, you can create a more secure and user-friendly application that restricts access to certain features or data as needed.