The AuthKit library for Remix provides convenient helpers for authentication and session management using WorkOS & AuthKit with Remix. You can find this library in action in the remix-authkit-example repo.

Install the package with:

npm i @workos-inc/authkit-remix

or

yarn add @workos-inc/authkit-remix

AuthKit for Remix offers a flexible configuration system that allows you to customize various settings. You can configure the library in three ways:

The simplest way is to set environment variables in your .env.local file:

WORKOS_CLIENT_ID="client_..." # retrieved from the WorkOS dashboard
WORKOS_API_KEY="sk_test_..." # retrieved from the WorkOS dashboard
WORKOS_REDIRECT_URI="http://localhost:5173/callback" # configured in the WorkOS dashboard
WORKOS_COOKIE_PASSWORD="<your password>" # generate a secure password here

You can also configure AuthKit programmatically by importing the configure function:

import { configure } from '@workos-inc/authkit-remix';
// In your root or entry file
configure({
  clientId: 'client_1234567890',
  apiKey: 'sk_test_1234567890',
  redirectUri: 'http://localhost:5173/callback',
  cookiePassword: 'your-secure-cookie-password',
  // Optional settings
  cookieName: 'my-custom-cookie-name',
  apiHttps: true,
  cookieMaxAge: 60 * 60 * 24 * 30, // 30 days
});

For non-standard environments (like Deno or Edge functions), you can provide a custom environment variable source:

import { configure } from '@workos-inc/authkit-remix';

configure(key => Deno.env.get(key));
// Or combine with explicit values
configure(
  { clientId: 'client_1234567890' },
  key => Deno.env.get(key)
);

When retrieving configuration values, AuthKit follows this priority order:

1. Programmatically provided values via configure()
2. Environment variables (prefixed with WORKOS_)
3. Default values for optional settings

AuthKit requires that you have a callback URL to redirect users back to after they've authenticated. In your Remix app, create a new route and add the following:

import { authLoader } from '@workos-inc/authkit-remix';

export const loader = authLoader();

Make sure this route matches the WORKOS_REDIRECT_URI variable and the configured redirect URI in your WorkOS dashboard. For instance if your redirect URI is http://localhost:2884/callback then you'd put the above code in /app/routes/callback.ts.

You can also control the pathname the user will be sent to after signing-in by passing a returnPathname option to authLoader like so:

export const loader = authLoader({ returnPathname: '/dashboard' });

If your application needs to persist oauthTokens or other auth-related information after the callback is successful, you can pass an onSuccess option:

export const loader = authLoader({
  onSuccess: async ({ oauthTokens }) => {
    await saveToDatabase(oauthTokens);
  },
});

Use authkitLoader to configure AuthKit for your Remix application routes.

import type { LoaderFunctionArgs } from '@remix-run/node';
import { useLoaderData } from '@remix-run/react';
import { authkitLoader } from '@workos-inc/authkit-remix';

export const loader = (args: LoaderFunctionArgs) => authkitLoader(args);

export function App() {
  // Retrieves the user from the session or returns `null` if no user is signed in
  // Other supported values include `sessionId`, `accessToken`, `organizationId`,
  // `role`, `permissions`, `entitlements`, and `impersonator`.
  const { user, signInUrl, signUpUrl } = useLoaderData<typeof loader>();

  return (
    <div>
      <p>Welcome back {user?.firstName && `, ${user?.firstName}`}</p>
    </div>
  );
}

For pages where you want to display a signed-in and signed-out view, use authkitLoader to retrieve the user profile from WorkOS. You can pass in additional data by providing a loader function directly to authkitLoader.

import type { ActionFunctionArgs, LoaderFunctionArgs } from '@remix-run/node';
import { json } from '@remix-run/node';
import { Form, Link, useLoaderData } from '@remix-run/react';
import { getSignInUrl, getSignUpUrl, signOut, authkitLoader } from '@workos-inc/authkit-remix';

export const loader = (args: LoaderFunctionArgs) =>
  authkitLoader(args, async ({ request, auth }) => {
    return json({
      signInUrl: await getSignInUrl(),
      signUpUrl: await getSignUpUrl(),
    });
  });

export async function action({ request }: ActionFunctionArgs) {
  return await signOut(request);
}

export default function HomePage() {
  const { user, signInUrl, signUpUrl } = useLoaderData<typeof loader>();

  if (!user) {
    return (
      <>
        <Link to={signInUrl}>Log in</Link>
        <br />
        <Link to={signUpUrl}>Sign Up</Link>
      </>
    );
  }

  return (
    <Form method="post">
      <p>Welcome back {user?.firstName && `, ${user?.firstName}`}</p>
      <button type="submit">Sign out</button>
    </Form>
  );
}

For pages where a signed-in user is mandatory, you can use the ensureSignedIn option:

export const loader = (args: LoaderFunctionArgs) => authkitLoader(args, { ensureSignedIn: true });

Enabling ensureSignedIn will redirect users to AuthKit if they attempt to access the page without being authenticated.

Use the signOut method to sign out the current logged in user, end the session, and redirect to your app's homepage. The homepage redirect is set in your WorkOS dashboard settings under "Redirect".

Sometimes it is useful to obtain the access token directly, for instance to make API requests to another service.

import type { LoaderFunctionArgs } from '@remix-run/node';
import { json } from '@remix-run/node';
import { authkitLoader } from '@workos-inc/authkit-remix';

export const loader = (args: LoaderFunctionArgs) =>
  authkitLoader(args, async ({ auth }) => {
    const { accessToken } = auth;

    if (!accessToken) {
      // Not signed in
    }

    const serviceData = await fetch('/api/path', {
      headers: {
        Authorization: `Bearer ${accessToken}`,
      },
    });

    return json({
      data: serviceData,
    });
  });

To enable debug logs, pass in the debug flag when using authkitLoader.

import { authkitLoader } from '@workos-inc/authkit-remix';

export const loader = (args: LoaderFunctionArgs) => authkitLoader(args, { debug: true });

If providing a loader function, you can pass the options object as the third parameter

import { authkitLoader } from '@workos-inc/authkit-remix';

export const loader = (args: LoaderFunctionArgs) =>
  authkitLoader(
    args,
    async ({ auth }) => {
      return json({ foo: 'bar' });
    },
    { debug: true },
  );