To implement OTP (One-Time Password) login using Next.js with NextAuth.js, you can follow these steps:

  1. Install Dependencies: Start by creating a new Next.js project and install the required dependencies:

    bash
    npx create-next-app my-otp-login cd my-otp-login npm install next-auth
  2. Configure NextAuth.js: Create a new file called next-auth.js in the root of your project to configure NextAuth.js:

    javascript
    // next-auth.js import NextAuth from 'next-auth'; import Providers from 'next-auth/providers'; export default NextAuth({ providers: [ Providers.Credentials({ credentials: { username: { label: 'Username', type: 'text' }, password: { label: 'Password', type: 'password' }, }, async authorize(credentials) { // Add logic here to handle OTP validation and user authentication // Example: You can call an API to validate the OTP and fetch user data const user = { id: 1, name: 'John Doe', email: 'john@example.com' }; if (user) { return Promise.resolve(user); } else { return Promise.resolve(null); } }, }), ], });

    In this configuration, we use the Credentials provider to handle username and password authentication. In the authorize function, you should implement the logic to validate the OTP provided by the user. You can call an API or perform any other validation process to determine if the OTP is valid and fetch user data if needed.

  3. Create the Login Page: Create a new file called login.js in the pages directory to handle the OTP login:

    jsx
    // pages/login.js import { useState } from 'react'; import { signIn } from 'next-auth/react'; export default function LoginPage() { const [username, setUsername] = useState(''); const [password, setPassword] = useState(''); const handleLogin = async (e) => { e.preventDefault(); const result = await signIn('credentials', { username, password, }); console.log(result); }; return ( <form onSubmit={handleLogin}> <input type="text" placeholder="Username" value={username} onChange={(e) => setUsername(e.target.value)} /> <input type="password" placeholder="Password" value={password} onChange={(e) => setPassword(e.target.value)} /> <button type="submit">Login</button> </form> ); }
  4. Update pages/api/auth/[...nextauth].js: NextAuth.js automatically creates an API route for authentication. Update the [...nextauth].js file in the pages/api/auth directory:

    javascript
    // pages/api/auth/[...nextauth].js import NextAuth from 'next-auth'; import Providers from 'next-auth/providers'; export default NextAuth({ providers: [ Providers.Credentials({ credentials: { username: { label: 'Username', type: 'text' }, password: { label: 'Password', type: 'password' }, }, async authorize(credentials) { // Add logic here to handle OTP validation and user authentication // Example: You can call an API to validate the OTP and fetch user data const user = { id: 1, name: 'John Doe', email: 'john@example.com' }; if (user) { return Promise.resolve(user); } else { return Promise.resolve(null); } }, }), ], });
  5. Run the Application: Start your Next.js development server:

    bash
    npm run dev

    Visit http://localhost:3000/login in your browser, enter the OTP credentials, and click the "Login" button. The user will be authenticated based on the OTP validation logic implemented in the authorize function.

Remember that this is a simplified example, and you should implement the actual OTP validation process and user authentication according to your specific requirements. Additionally, consider adding more security features, such as rate-limiting, to protect against brute-force attacks on the OTP login.

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