# Affinidi Login with NextJS > In this guide, learn how to enable passwordless login in your application with basic implementation of Affinidi Login. The Affinidi Login can be integrated with any application that supports OIDC flow. This lab uses [NextJS](https://nextjs.org/) and [NextAuth.js](https://next-auth.js.org/) as the framework to implement Affinidi Login. ## Before you begin - Set up Affinidi Vault account. Follow the guide below if you haven’t set it up yet. Set up Affinidi Vault Set up an Affinidi Vault account using the [Web Vault](https://vault.affinidi.com) or install the Mobile Vault (for [Android](https://play.google.com/store/apps/details?id=com.affinidi.vault&pcampaignid=web_share)). The same setup steps for Mobile Vault. - Click on Get started if you are creating a new account, or click on Restore from Backup if you have an existing backup of your Affinidi Vault. Provide the passphrase to secure your Affinidi Vault. You have the option to enable Biometrics to unlock your Affinidi Vault easily instead of using passphrase. GIF - Enter your email address to register with the Affinidi Vault. An OTP will be sent to this email for verification. GIF - Enter the OTP sent to the email you have provided for verification to complete the setup. GIF After successfully providing the OTP, you are redirected to the Affinidi Vault dashboard. Important Note Remember to keep your passphrase in a secure location. Use the Passphrase Reset feature in Affinidi Vault settings to generate the PDF files and keep them safe, which you can use to recover access to your Affinidi Vault if you forget your passphrase. - Get the Redirect URI of your application for OIDC. This is the URI configured on your Login Configuration to receive the idToken after successful authorisation. - Optionally, install the Affinidi CLI. Follow the guide below if it hasn’t been installed. Set up Affinidi CLI - Download and install [NodeJS](https://nodejs.org/en/download) on your machine if you haven’t set it up yet. Node Version Affinidi CLI requires Node version 18 and above. - Install Affinidi CLI using Node Package Manager (npm). ```bash npm install -g @affinidi/cli ``` - Verify that the installation is successful. ```bash affinidi --version ``` ## Download Application You can [clone](https://github.com/affinidi/reference-app-affinidi-vault/tree/main/samples/affinidi-nextjs-nextauthjs) this sample application using Next.js framework from our Github and start exploring how to integrate Affinidi Login to provide a passwordless login experience for your end-users. Important Note The downloadable sample application is provided only as a guide to quickly explore and learn how to integrate the components of Affinidi Trust Network into your application. This is NOT a Production-ready implementation. Do not deploy this to a production environment. ## Running the Application - Suppose this is your first time downloading the sample application. Run the following command to install the dependencies. ```bash npm install ``` - Create the .env file in the sample application by running the following command. ```bash cp .env.example .env ``` If you open the sample application in a Code Editor, duplicate the .env.example and rename it .env. - After installing the dependencies, run the application by running the command. ```bash npm run dev ``` Running the application for the first time without configuring the .env file will throw an exception error. We will configure the required environment variables in the following steps of this guide. You may refer to the included README.md file for more details. ## Create Login Configuration To create a Login Configuration, you can either use Affinidi CLI or [Affinidi Portal ](/dev-tools/affinidi-portal.md#create-a-login-configuration). Expand the section below for your preferred method: Name: My first config Redirect URIs: http://localhost:3000/api/auth/callback/affinidi Using Affinidi CLI - Log in to Affinidi CLI by running: ```Bash affinidi start ``` - Once you have successfully logged in, create the Login Configuration by running: ```Bash affinidi login create-config \ --name='My Basic App' \ --redirect-uris='http://localhost:3000/api/auth/callback/affinidi' ``` - --name is what you want your login configuration to be called. - --redirect-uris is the URL on your application where the user gets redirected after the successful authentication. Sample response: ```JSON { "ari": "ari:identity:ap-southeast-1:687b8872-a618-dt63-8978-e72ac32daeb1:login_configuration/c4f74d936cd31bde1c1fd3c1050bb76s", "projectId": "687b8872-a618-4e52-8978-e72ac32daec2", "configurationId": "c4f74d936cd31bde1c1fd3c1050bb62d", "name": "My Basic App", "auth": { "clientId": "", "clientSecret": "", "issuer": "https:// .apse1.login.affinidi.io" }, "redirectUris": [ "..." ], "clientMetadata": { "name": "My Basic App", "logo": "https://login.affinidi.com/default-client-logo.svg", "origin": "https://example.com" }, "creationDate": "2023-08-11T06:26:37Z", "tokenEndpointAuthMethod": "client_secret_post" } ``` Learn more on how to manage your Login Configurations using [Affinidi CLI](/dev-tools/affinidi-cli.md#affinidi-vpa-configs). Using Affinidi Portal - Go to [Affinidi Login ](https://portal.affinidi.com/affinidiLogin) under the Services section. - Click on the Create Login Configuration and provide the required details. - Name is the string that describes your login configuration. - Redirect URIs is the URL on your application where the user gets redirected after the successful authentication. - Click on create and confirm if all the details are correct. - After confirming the details, another popup shows the Client ID and Client Secret for your Login Configuration. Copy the generated Client Credentials and use them to integrate with Affinidi Login. - After copying the Client ID and Client Secret and closing the popup, you are redirected back to the Affinidi Login page. Login Configuration uses the default Presentation Definition (presentationDefinition) and ID Token Mapping (idTokenMapping) that is used to request the user’s email address during the authentication flow. Important Safeguard the Client ID and Client Secret diligently; you'll need them for setting up your IdP or OIDC-compliant applications. Remember, the Client Secret will be provided only once. ## Set up the Sample Application In this guide, learn how to integrate Affinidi Login using [NextJS](https://nextjs.org/) and [NextAuth.js](https://next-auth.js.org/) framework. #### Configure .env file Set the environment variables based on the auth credentials received from the Login Configuration created earlier: ```JSON { "auth": { "clientId": "", "clientSecret": "", "issuer": "https:// .apse1.login.affinidi.io" } } ``` Set the following fields in the .env file ```yaml PROVIDER_CLIENT_ID="" PROVIDER_CLIENT_SECRET="" PROVIDER_ISSUER="" ``` #### Configure NextAuth for Affinidi Login Using the NextAuth.js library, configure the nextauth file to enable Affinidi Login as a login provider and set up the JWT and Session from the idToken sent by the Affinidi Login after the user successfully authenticates. ##### Add Affinidi Login as a Login Provider In the code below, Affinidi Login is added as one of the Login Providers for NextAuth.js. The credentials generated by the Login Configuration are configured here and sent to the Affinidi Login service as part of the payload. File path: src/lib/auth/auth-provider.ts ```Javascript export const provider: Provider = { id: "affinidi", name: "Affinidi", clientId: providerClientId, clientSecret: providerClientSecret, type: "oauth", wellKnown: `${providerIssuer}/.well-known/openid-configuration`, authorization: { params: { prompt: "login", scope: "openid offline_access", }, }, client: { token_endpoint_auth_method: "client_secret_post", }, idToken: true, profile(profile) { return { id: profile.sub, email: profile.custom?.find((i: any) => typeof i.email === "string") ?.email, }; }, }; ``` ##### Generate JWT and Session from the idToken In the code below, the JWT and the session are generated from the idToken received from Affinidi Login following successful user authentication. File path: src/lib/auth/auth-options.ts ```Javascript async jwt({ token, account, profile }) { const profileItems = (profile as any)?.[PROVIDER_ATTRIBUTES_KEY]; if (profile && profileItems) { let userDID: string; let user: UserInfo = {}; userDID = profileItems.find( (item: any) => typeof item.did === "string" )?.did; user.email = profileItems.find( (item: any) => typeof item.email === "string" )?.email; user.country = profileItems.find( (item: any) => typeof item.address === "object" )?.address?.country; token = { ...token, user, ...(userDID && { userId: userDID }), }; } if (account) { token = { ...token, ...(account?.access_token && { accessToken: account.access_token }), ...(account?.id_token && { idToken: account.id_token }), }; } return token; }, // session is persisted as an HttpOnly cookie async session({ session, token }) { return { ...session, ...(token.user && { user: { ...session.user, ...token.user } }), ...(token.accessToken && { accessToken: token.accessToken }), ...(token.idToken && { idToken: token.idToken }), ...(token.userId && { userId: token.userId }), }; }, ``` The above files are then declared in the NextAuth file to register the login provider and the functions to handle the idToken response from Affinidi Login. File path: src/pages/api/auth/[...nextauth].ts ```Javascript import { authOptions } from "src/lib/auth/auth-options"; import NextAuth from "next-auth"; export default NextAuth(authOptions); ``` Additionally, you will notice in line 31 that we are parsing the country field. This optional process requires updating the Presentation Definition and ID Token Mapping of the Login Configuration to request the user profile from the Vault. ```Javascript user.country = profileItems.find( (item: any) => typeof item.address === "object" )?.address?.country; ``` You can refer to [this guide](/products/affinidi-elements/affinidi-login/login-configuration.md#update-login-configuration) to learn how to update the Presentation Definition and ID Token Mapping. #### Enable Affinidi Login In the code below, we are enabling Affinidi Login into the Login page of the sample app and referencing the NextAuth provider configured earlier. File path: src/lib/auth/client-login.ts ```Javascript import { signIn } from "next-auth/react"; import { hostUrl } from "src/lib/variables"; export async function clientLogin() { await signIn("affinidi", { callbackUrl: hostUrl }); } ``` We include the above file in the SignIn page of the sample app and attach the event in the Login button to initiate the authentication flow. ```Javascript Affinidi Login ``` ## Summary ```mermaid sequenceDiagram actor User participant Website participant Affinidi Login participant Affinidi Vault participant Affinidi Verifier User->>Website: My Login Website->>Affinidi Login: Authenticate user Note over Website, Affinidi Login: login_challenge Affinidi Login->>Affinidi Vault: Verify user identity Note over Affinidi Login, Affinidi Vault: presentationDefinition Affinidi Vault->>User: Request user confirmation to share Email VC User->>Affinidi Vault: User confirmed consent to share Email VC Affinidi Vault->>Affinidi Vault: Generate VP Token from VC Affinidi Vault->>Affinidi Login: Send Email VP Token Affinidi Login->>Affinidi Verifier: Validate VP Token Note over Affinidi Login, Affinidi Verifier: vp_token, presentation_submission, presentation_definition Affinidi Login->>Affinidi Login: Generate idToken Affinidi Login->>Website: Send generated idToken from VP Website->>User: Provide access to the user ``` Using the sample application, we have configured it to integrate with Affinidi Login as the OIDC provider and parse the idToken sent by the Affinidi Login to confirm the user’s successful authentication using the Affinidi Vault.