1. Configuration

What type of UI are you using?

1. Install supertokens package

yarn add supertokens-node supertokens-auth-react supertokens-web-js nextjs-cors

2. Create configuration files

• Create a config folder in the app directory of your project.
• Create an appInfo.ts inside the config folder.
• Create a backend.ts inside the config folder.
• Create a frontend.ts inside the config folder.

3. Create the appInfo configuration.

App Info

Adjust these values based on the application that you are trying to configure. To learn more about what each field means check the references page.

Application NameThis is the URL of your app's API server.

API DomainThis is the URL of your app's API server.

API Base PathSuperTokens will expose it's APIs scoped by this base API path.

Website DomainThis is the URL of your website.

Website Base PathThe path where the login UI will be rendered

app/config/appInfo.ts

export const appInfo = {
  // learn more about this on https://supertokens.com/docs/thirdpartyemailpassword/appinfo
  appName: "<YOUR_APP_NAME>",
  apiDomain: "<YOUR_API_DOMAIN>",
  websiteDomain: "<YOUR_WEBSITE_DOMAIN>",
  apiBasePath: "/auth",
  websiteBasePath: "/auth"
}

4. Create a frontend config function

app/config/frontend.tsx

import EmailPasswordReact from 'supertokens-auth-react/recipe/emailpassword'
import SessionReact from 'supertokens-auth-react/recipe/session'
import { appInfo } from './appInfo'
import { useRouter } from "next/navigation";
import { SuperTokensConfig } from 'supertokens-auth-react/lib/build/types'

const routerInfo: { router?: ReturnType<typeof useRouter>; pathName?: string } =
  {};

export function setRouter(
  router: ReturnType<typeof useRouter>,
  pathName: string,
) {
  routerInfo.router = router;
  routerInfo.pathName = pathName;
}

export const frontendConfig = (): SuperTokensConfig => {
  return {
    appInfo,
    recipeList: [
      EmailPasswordReact.init(),
      SessionReact.init(),
    ],
    windowHandler: (original) => ({
      ...original,
      location: {
        ...original.location,
        getPathName: () => routerInfo.pathName!,
        assign: (url) => routerInfo.router!.push(url.toString()),
        setHref: (url) => routerInfo.router!.push(url.toString()),
      },
    }),
  }
}

5. Create a backend config function

app/config/backend.ts

import SuperTokens from "supertokens-node";
import EmailPasswordNode from 'supertokens-node/recipe/emailpassword'
import SessionNode from 'supertokens-node/recipe/session'
import { appInfo } from './appInfo'
import { TypeInput } from "supertokens-node/types";

export const backendConfig = (): TypeInput => {
  return {
    framework: "custom",
    supertokens: {
      connectionURI: "<CORE_API_ENDPOINT>",
      apiKey: "<YOUR_API_KEY>",
    },
    appInfo,
    recipeList: [
      EmailPasswordNode.init(),
      SessionNode.init(),
    ],
    isInServerlessEnv: true,
  }
}

let initialized = false;
// This function is used in your APIs to make sure SuperTokens is initialised
export function ensureSuperTokensInit() {
  if (!initialized) {
    SuperTokens.init(backendConfig());
    initialized = true;
  }
}

ensureSuperTokensinit is a helper function that can be used in your API routes to make sure SuperTokens is initialised before using any functionality exposed by the backend SDKs.

6. Call the frontend init functions and wrap with <SuperTokensWrapper> component

• Create a client component /app/components/supertokensProvider.tsx. This file will initialise SuperTokens and wrap its children with the SuperTokensWrapper component
• Modify the /app/layout.tsx file to use the SuperTokensProvider component. You can learn more about this file here.
• An example of this can be found here

/app/components/supertokensProvider.tsx

'use client';
import React from 'react';
import { SuperTokensWrapper } from 'supertokens-auth-react';
import SuperTokensReact from 'supertokens-auth-react';
import { frontendConfig, setRouter } from '../config/frontend';
import { usePathname, useRouter } from 'next/navigation';

if (typeof window !== 'undefined') {
  // we only want to call this init function on the frontend, so we check typeof window !== 'undefined'
  SuperTokensReact.init(frontendConfig());
}

export const SuperTokensProvider: React.FC<React.PropsWithChildren<{}>> = ({
  children,
}) => {
  setRouter(useRouter(), usePathname() || window.location.pathname);

  return <SuperTokensWrapper>{children}</SuperTokensWrapper>;
};

/app/layout.tsx

import './globals.css'
import type { Metadata } from 'next'
import { Inter } from 'next/font/google'
import { SuperTokensProvider } from "./components/supertokensProvider";

const inter = Inter({ subsets: ['latin'] })

export const metadata: Metadata = {
  title: 'Create Next App',
  description: 'Generated by create next app',
}

export default function RootLayout({
  children,
}: {
  children: React.ReactNode
}) {
  return (
    <html lang="en">
      <SuperTokensProvider>
        <body className={inter.className}>{children}</body>
      </SuperTokensProvider>
    </html>
  )
}