Next.js

If you want to interact with a working version of the Auth + Next integration that we'll be building in this guide, you can check the following GitHub repository, or clone it with the command below:

npx thirdweb create app --template thirdweb-auth-next

npm i thirdweb

Setup your .env file with the following:

# the DOMAIN is the domain of the application
NEXT_PUBLIC_THIRDWEB_AUTH_DOMAIN=
# Get your client id from the thirdweb dashboard: https://thirdweb.com/create-api-key
NEXT_PUBLIC_THIRDWEB_CLIENT_ID=
# Get your secret key from the thirdweb dashboard: https://thirdweb.com/create-api-key
THIRDWEB_SECRET_KEY=
# A private key that will be used to sign the JWT for the `jwt-cookie` authentication method
# this does *not* need to hold any funds, just needs to be a valid private key to sign with
THIRDWEB_ADMIN_PRIVATE_KEY=

Create a lib directory inside src and create a client.ts file inside it:

// lib/client.ts
import { createThirdwebClient } from "thirdweb";
 
const clientId = process.env.NEXT_PUBLIC_THIRDWEB_CLIENT_ID!; // this will be used on the client
const secretKey = process.env.THIRDWEB_SECRET_KEY!; // this will be used on the server-side
 
export const client = createThirdwebClient(
  secretKey
    ? { secretKey }
    : {
        clientId,
      },
);

Add the ThirdwebProvider in your root layout:

// app/layout.tsx
import { ThirdwebProvider } from "thirdweb/react";
 
const Layout = ({ children }: { children: React.ReactNode }) => {
  return <ThirdwebProvider>{children}</ThirdwebProvider>;
};
 
export default Layout;

There are two ways to setup Auth on the client-side of a Next.js application, the Connect Button or your own custom component. For both cases, we'll use a JWT in a cookie to store the user's session and authenticate across the app. The connect button will handle a lot of the underlying complexity for you, but if you would like to bring your own components the functions it uses are exposed for your custom use case.

// app/page.tsx
import type { NextPage } from "next";
import { ConnectButton } from "thirdweb/react";
import { client } from "@/lib/client";
import {
  generatePayload,
  isLoggedIn,
  login,
  logout,
} from "@/actions/auth"; // we'll create this file in the next section
 
const Page = () => {
  return (
    <ConnectButton
      client={client}
      auth={{
        isLoggedIn: async (address) => {
          console.log("checking if logged in!", { address });
          return await isLoggedIn();
        },
        doLogin: async (params) => {
          console.log("logging in!");
          await login(params);
        },
        getLoginPayload: async ({ address }) =>
          generatePayload({ address }),
        doLogout: async () => {
          console.log("logging out!");
          await logout();
        },
      }}
    />
  );
};
 
export default Page;

// app/page.tsx
import ConnectButton from "@/components/ConnectButton";
 
const Home = () => {
  return <ConnectButton />;
};
 
export default Home;

We'll use server functions to keep your login secure and concise.

Create an actions directory with a login.ts file with the following:

"use server";
import { VerifyLoginPayloadParams, createAuth } from "thirdweb/auth";
import { privateKeyAccount } from "thirdweb/wallets";
import { client } from "@/lib/client";
import { cookies } from "next/headers";
 
const privateKey = process.env.THIRDWEB_ADMIN_PRIVATE_KEY || "";
 
if (!privateKey) {
  throw new Error("Missing THIRDWEB_ADMIN_PRIVATE_KEY in .env file.");
}
 
const thirdwebAuth = createAuth({
  domain: process.env.NEXT_PUBLIC_THIRDWEB_AUTH_DOMAIN || "",
  adminAccount: privateKeyAccount({ client, privateKey }),
});
 
export const generatePayload = thirdwebAuth.generatePayload;
 
export async function login(payload: VerifyLoginPayloadParams) {
  const verifiedPayload = await thirdwebAuth.verifyPayload(payload);
  if (verifiedPayload.valid) {
    const jwt = await thirdwebAuth.generateJWT({
      payload: verifiedPayload.payload,
    });
    cookies().set("jwt", jwt);
  }
}
 
export async function isLoggedIn() {
  const jwt = cookies().get("jwt");
  if (!jwt?.value) {
    return false;
  }
 
  const authResult = await thirdwebAuth.verifyJWT({ jwt: jwt.value });
  if (!authResult.valid) {
    return false;
  }
  return true;
}
 
export async function logout() {
  cookies().delete("jwt");
}

You can include custom context in the JWT token with the context parameter:

const jwt = await thirdwebAuth.generateJWT({
  payload: verifiedPayload.payload,
  context: {
    admin: true,
  },
});

Now anywhere in your project, you can check a user's authentication status:

import { redirect } from "next/navigation";
import { isLoggedIn } from "../actions/auth";
 
const AuthenticatedPage = async () => {
  // redirect back if user is not logged in
  if (!(await isLoggedIn())) {
    redirect("/connect-button");
  }
 
  return (
    <div>
      <h1>Logged In Page</h1>
      <p>You are logged in, so you can see this page!</p>
    </div>
  );
};
 
export default AuthenticatedPage;

That's it! You know have a working SIWE Next.js app.

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