Hosted Login Integration (Next.js)

❗️

Important Notes and Prerequisites

  • Frontegg Next.js integration is dependent on SSR (Server Side Rendering). Consequently, Frontegg hooks will not work with Static Site Generation (SSG).
  • Required minimum versions:
    Next.js >= 12
    Typescript >= 3.9.7
    frontegg/nextjs >= 7.0.0
  • If you are using @frontegg/nextjs =< 7.0.0, please see the migration guide here

This guide will seamlessly walk you through integrating Frontegg's login box into your Next.js application, with robust functionalities including Sign In, Sign Up, and Single Sign-On (SSO). Streamline your authentication process with just a few lines of code, leveraging the power of redirects, OpenID Connect, and OAuth2.


⚡️ The code in the sample below is available in our Frontegg Samples repository in GitHub ⚡️

⚡ Before you start: ⚡

📘

Getting your Frontegg subdomain and clientId

Frontegg creates a unique subdomain and client id for every environment created on the account. In order to retrieve the clientId subdomain that will act as the FRONTEGG_BASE_URL in the integration, navigate to your environment 'Settings' menu, copy the Frontegg domain and clientId and use them in .env.local file.

STEP 1: Create Frontegg Next.js sample app.

📘

If you have an existing app with Next.js app, skip this step.


To create a new app based on our sample or Next.js template or a new Next.js app, run the below commands.

npx create-next-app my-nextjs-app-name

// Next.js with experimental app directory
npx create-next-app --experimental-app my-nextjs-app-name

cd my-nextjs-app-name
// Next.js 13 will be installed by default
yarn create next-app my-nextjs-app-name

// Next.js with experimental app directory
yarn create-next-app --experimental-app my-nextjs-app-name

cd my-nextjs-app-name

STEP 2: Install frontegg/nextjs

Run the following command to install @frontegg/nextjs.


npm install @frontegg/nextjs@latest
yarn add @frontegg/nextjs@latest

📘

Note - the files in this guide are in typescript - if you are working in js, simply change the file types and remove the typing

STEP 3: Configure the App file, Router, Middleware files

When integrating Next.js application with Frontegg, Next.js custom app and several files should be added. Make sure that these exist in the project you cloned from our sample or created.

Next.js pages Architecture

Create custom Next.js files under the pages directory and paste the snippets below:


📘

Existing custom Next.js app

If you have a custom app already (the file _app.tsx exists), wrap and replace the default export component with withFronteggApp function and pass your original component.


import { withFronteggApp } from "@frontegg/nextjs/pages";

function CustomApp({ Component, pageProps }: AppProps) {
  return <Component {...pageProps} />;
}

export default withFronteggApp(CustomApp, {
  hostedLoginBox: true,
  authOptions: {
    // keepSessionAlive: true, // Uncomment this in order to maintain the session alive
  },
});
import { FronteggApiMiddleware } from '@frontegg/nextjs/middleware';

export default FronteggApiMiddleware;
export const config = {
  api: {
    externalResolver: true,
    // https://nextjs.org/docs/messages/api-routes-response-size-limit
    responseLimit: false,
  },
};
import { FronteggRouter, FronteggRouterProps } from '@frontegg/nextjs/pages';

export const getServerSideProps = FronteggRouterProps;
export default FronteggRouter;

Next.js appDir Architecture

Create custom Next.js files under app directory and paste the snippets below. The ./pages/api/frontegg/[...frontegg-middleware].ts file should stay in the pages directory:


import { FronteggAppProvider } from '@frontegg/nextjs/app';

export default function RootLayout({ children }: { children: React.ReactNode }) {
    const authOptions = {
      keepSessionAlive: true // Uncomment this in order to maintain the session alive
    }
    
    return (
      <html>
        <head></head>
        <body>
            {/* @ts-expect-error Server Component for more details visit: https://github.com/vercel/next.js/issues/42292 */}
            <FronteggAppProvider authOptions={authOptions} hostedLoginBox={true}>
                {children}
            </FronteggAppProvider>
        </body>
      </html>
    );
}
import { FronteggAppRouter } from '@frontegg/nextjs/app';

export default FronteggAppRouter;
import { FronteggApiMiddleware } from '@frontegg/nextjs/middleware';

export default FronteggApiMiddleware;
export const config = {
  api: {
    externalResolver: true,
    // https://nextjs.org/docs/messages/api-routes-response-size-limit
    responseLimit: false,
  },
};
"use client";
import { useAuth, useLoginWithRedirect } from "@frontegg/nextjs";//, useLoginWithRedirect 
import { AdminPortal } from '@frontegg/nextjs'
import { useRouter } from 'next/navigation';

export const ClientComponent = () => {
  const { user, isAuthenticated } = useAuth();
  const loginWithRedirect = useLoginWithRedirect();
  const router = useRouter();

  const logout = useCallback(() => {
    router.replace('/account/logout');
  }, [router]);


  return (
    <div className="App">
      {isAuthenticated ? (
        <div>
          <div>
            <img src={user?.profilePictureUrl} alt={user?.name} />
          </div>
          <div>
            <span>Logged in as: {user?.name}</span>
          </div>
          <div>
            <button onClick={() => alert(user?.accessToken)}>
              What is my access token?
            </button>
          </div>
          <div>
            <button onClick={() => logout()}>Click to logout</button>
          </div>
          <div>
          <button onClick={handleClick}>Settings</button>
          </div>
        </div>
      ) : (
        <><></><div>
            <button onClick={() => loginWithRedirect()}>Click me to login</button>
         </div></>
      )}
    </div>
  );
};
import { getAppUserSession, getAppUserTokens } from '@frontegg/nextjs/app';

export const ServerSession = async () => {
  const userSession = await getAppUserSession();
  const tokens = await getAppUserTokens();
  return (
    <div>
      <div>user session server side: {JSON.stringify(userSession)}</div>;
      <div>user tokens server side: {JSON.stringify(tokens)}</div>
    </div>
  );
};
import { ClientComponent } from "./ClientComponent";
import { ServerSession } from "./ServerComponent";

export default function MainPage() {

  return (
    <div>
      <h3>Next JS application with frontegg</h3>
      {/* @ts-expect-error Server Component for more details visit: https://github.com/vercel/next.js/issues/42292 */}
      <ServerSession />
      <ClientComponent/>
    </div>
  );
}

🚧

File Names

The locations and the file names should be exactly as written on the file names, including the brackets and the three dots.

For pages directory - ./pages/[...frontegg-router].tsx, ./pages/api/frontegg/[...frontegg-middleware].ts and ./pages/_app.tsx.

For app directory - ./app/layout.tsx , ./app/[...frontegg-router]/page.tsx, ./app/ServerComponent.tsx, app/ClientComponent.tsx.

STEP 4 Setup Environment

To setup your Next.js application to communicate with Frontegg, you have to create a new file named .env.local under your root project directory, this file will be used to store environment variables that will be used, configuration options:

# The AppUrl you set during integration - this is to tell Frontegg your application hostname
FRONTEGG_APP_URL='http://localhost:3000'

# The Frontegg domain is your unique URL to connect to the Frontegg gateway
FRONTEGG_BASE_URL='https://[YOUR_SUBDOMAIN].frontegg.com'

# Your Frontegg application's Client ID
FRONTEGG_CLIENT_ID='[YOUR_CLIENT_ID]'

# The statless session encruption password, used to encrypt
# jwt before sending it to the client side.
#
# For quick password generation use the following command:
#    node -e "console.log(crypto.randomBytes(32).toString('hex'))"
FRONTEGG_ENCRYPTION_PASSWORD='[64_CHAR_SESSION_ENCRYPTION_PASSWORD]'

# The statless session cookie name - you should not change this
FRONTEGG_COOKIE_NAME='fe_session'

Remember to replace the relevant fields in this file with your personal information!

STEP 5 (optional) NextRequest

📘

Support for NextJS middleware is available from @frontegg/nextjs v6.4.0

To prevent access of an unauthenticated user to all routes, use Next.js middlewares.

NOTE: If you were using Middleware prior to 12.2, please see the upgrade guide.


🚧

Note

It is recommended to check for the user's session either on the middleware.ts or per each page. It is not recommended to use several sources for getting or checking for a user's session.

Frontegg uses getInitialProps in the Next.js wrapper, therefore, there is no need to call default getInitialProps and instead use context. Frontegg wrapper holds this data already.

import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { getSessionOnEdge, shouldByPassMiddleware, redirectToLogin } from '@frontegg/nextjs/edge';

export const middleware = async (request: NextRequest) => {
  const pathname = request.nextUrl.pathname;

  if (shouldByPassMiddleware(pathname)) {
    return NextResponse.next();
  }

  const session = await getSessionOnEdge(request);
  if (!session) {
    return redirectToLogin(pathname);
  }
  return NextResponse.next();
};

export const config = {
  matcher: '/(.*)',
};

📘

When to use shouldByPassMiddleware

  • To protect all application routes.
  • Static files and image requests.

The default whitelists:

  • _next/static (static files)
  • _next/image (image optimization files)
  • favicon.icon (favicon file)
  • api/frontegg (API frontegg middleware)
  • account/[login|logout|saml/callback|...] (Frontegg authentication routes)

You can override the whitelist by passing the options parameter

NOTE: this will slow down your application due to session checks.

STEP 6: Redirect to login from a page

Alternatively, you can use the Frontegg withSSRSession on each page, to redirect users to the login screen if they are not authenticated.

import { useCallback } from "react";
import { GetServerSideProps } from "next";
import { getSession } from "@frontegg/nextjs/pages";
import { useAuth } from "@frontegg/nextjs";
import { useRouter } from "next/router"

export default function MyPage({ products }) {
  const { user } = useAuth();

  const router = useRouter();

  const logout = useCallback(() => {
    router.replace('/account/logout');
  }, [router]);
 
  return (
    <div>
      <h1>My Page</h1>
      {products}
      <div>
        <img src={user?.profilePictureUrl} alt={user?.name} />
      </div>
      <div>
        <span>Logged in as: {user?.name}</span>
      </div>
      <div>
        <button onClick={logout}>Log out</button>
      </div>
    </div>
  );
}

// In the `getServerSideProps` method you can get data from an external service to pull relevant data for a logged in user.
// we used the prop `products`. See the commented code for an example.

export const getServerSideProps: GetServerSideProps = withSSRSession(
  async (context, session) => {
    //     const { data } = await fetch('{external}/product', {
    //      headers: {
    //        Authorization: 'bearer ' + session.accessToken,
    //      },
    //    });
    return { props: {} };
  }
);

STEP 7 (optional) getSession

As an extension of step 6, for any page that requires an AccessToken on the server side (e.g. you'd like to load the data only if a user is logged in), you can use the getSession method. Remember to replace external with the link to your external service.

import { GetServerSideProps } from 'next';
import { getSession } from '@frontegg/nextjs/pages';

export default function MyPage({ products }) {
  return (
    <div>
      <h1>My Page</h1>
      {products}
    </div>
  );
}

export const getServerSideProps: GetServerSideProps = async (context) => {
  const session = await getSession(context.req);
  if (session) {
    const { data } = await fetch('{external}/product', {
      headers: {
        Authorization: 'bearer ' + session.accessToken,
      },
    });
    return { props: { products: data } };
  }

  return { props: { products: [] } };
};

STEP 8 (optional) customLoader

import "../styles/globals.css";

export default withFronteggApp(CustomApp, 
  {
    hostedLoginBox: true, 
  	customLoader: true,
    authOptions: {
    // keepSessionAlive: true // Uncomment this in order to maintain the session alive
    }
});

Add _document.tsx file under the pages folder.

import { Html, Head, Main, NextScript } from 'next/document';

export default function Document() {
  return (
    <Html>
      <Head />
      <body>
        <Main />
        <NextScript />
        <div className="custom-loader"> I am a custom loader!</div>
      </body>
    </Html>
  );
}

Add the following styles to styles/globals.css:

.custom-loader {
    width: 100vw;
    height: 100vh;
    background: red;
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    text-align: center;
    justify-content: center;
    align-items: center;
    font-size: 50px;
    color: white;
}

body.frontegg-loading .custom-loader {
    display: flex;
}

STEP 9: Verify Redirect URL

On the Frontegg portal, verify under the hosted login configuration, http://localhost:3000/oauth/callback is listed as the allowed redirectUrl.

2054

Preventing auto-refresh of access token

The middleware is set (by default) to refresh the access token even if it’s still valid. By using the following code, you can disable that behavior in your pages directory and re-use the access token while still valid:


DISABLE_INITIAL_PROPS_REFRESH_TOKEN=true