Implement JWT refresh token with NextAuth

NextAuth

To implement JWT refresh token with NextAuth, you can follow the steps mentioned below:

1. Install NextAuth.js: If you haven’t already done so, you need to install NextAuth.js in your Next.js application. NextAuth.js is a complete open-source authentication solution for Next.js applications.

npm install next-auth

2. Setup Credentials Provider: You can use the ‘CredentialsProvider’ in NextAuth.js to authenticate users with credentials (email and password). The object returned will be passed to the JWT callback

const providers = [
CredentialsProvider({
name: ‘Credentials’,
authorize: async (credentials) => {
try {
// Authenticate user with credentials
const user = await axios.post(YOUR_API_URL + ‘auth/login’, {
password: credentials.password,
email: credentials.email
});
if (user.data.accessToken) {
return user.data;
}
return null;
} catch (e) {
throw new Error(e);
}
}
})
]

3. JWT Callback: In the ‘jwt’ callback, you can decide whether the token is ready to be refreshed. You can also specify what will be available on the client with useSession() or getSession()

const callbacks = {
jwt: async ({ token, user }) => {
if (user) {
// This will only be executed at login. Each next invocation will skip this part.
token.accessToken = user.data.accessToken;
token.accessTokenExpiry = user.data.accessTokenExpiry;
token.refreshToken = user.data.refreshToken;
}
const shouldRefreshTime = Math.round((token.accessTokenExpiry — 60 * 60 * 1000) — Date.now());
if (shouldRefreshTime > 0) {
return Promise.resolve(token);
}
token = refreshAccessToken(token);
return Promise.resolve(token);
},
session: async ({ session, token }) => {
session.accessToken = token.accessToken;
session.accessTokenExpiry = token.accessTokenExpiry;
session.error = token.error;
return Promise.resolve(session);
},
}

4. Refresh Access Token: You can create a function to refresh the access token. This function will make a POST request to your refresh token endpoint with the refresh token, and return a new set of tokens.

async function refreshAccessToken(tokenObject) {
try {
// Get a new set of tokens with a refreshToken
const tokenResponse = await axios.post(YOUR_API_URL + ‘auth/refreshToken’, {
token: tokenObject.refreshToken
});
return {
…tokenObject,
accessToken: tokenResponse.data.accessToken,
accessTokenExpiry: tokenResponse.data.accessTokenExpiry,
refreshToken: tokenResponse.data.refreshToken
}
} catch (error) {
return {
…tokenObject,
error: “RefreshAccessTokenError”,
}
}
}

5. Client-Side Hook: You can create a hook on the client side that will sign out the user if the refresh token expires.

import { signOut, useSession } from “next-auth/react”;
import { useRouter } from “next/router”;
import { useEffect, useState } from “react”;

export default function useAuth(shouldRedirect) {
const { data: session } = useSession();
const router = useRouter();
const [isAuthenticated, setIsAuthenticated] = useState(false);

useEffect(() => {
if (session?.error === “RefreshAccessTokenError”) {
signOut({ callbackUrl: ‘/login’, redirect: shouldRedirect });
}
if (session === null) {
if (router.route !== ‘/login’) {
router.replace(‘/login’);
}
setIsAuthenticated(false);
} else if (session !== undefined) {
if (router.route === ‘/login’) {
router.replace(‘/’);
}
setIsAuthenticated(true);
}
}, [session]);

return isAuthenticated;
}

6. Implement NextAuth.js: Finally, you can implement NextAuth.js in your application.

const options = {
providers,
callbacks,
pages: {},
secret: ‘your_secret’
}

const Auth = (req, res) => NextAuth(req, res, options)
export default Auth;

Remember to replace 'your_secret' with your actual secret, and YOUR_API_URL with the actual API URL.

This setup should allow you to implement JWT refresh token with NextAuth.js.