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Input:

Convert this app from php to next.js <?php if (isset($_POST['username']) && $_POST['username'] && isset($_POST['password']) && $_POST['password']) { // do user authentication as per your requirements // ... // ... // based on successful authentication echo json_encode(array('success' => 1)); } else { echo json_encode(array('success' => 0)); } <!doctype html> <html> <head> <script src="https://code.jquery.com/jquery-3.3.1.js" integrity="sha256-2Kok7MbOyxpgUVvAk/HJ2jigOSYS2auK4Pfzbm7uH60=" crossorigin="anonymous"></script> </head> <body> <form id="loginform" method="post"> <div> Username: <input type="text" name="username" id="username" /> Password: <input type="password" name="password" id="password" /> <input type="submit" name="loginBtn" id="loginBtn" value="Login" /> </div> </form> <script type="text/javascript"> $(document).ready(function() { $('#loginform').submit(function(e) { e.preventDefault(); $.ajax({ type: "POST", url: 'login.php', data: $(this).serialize(), success: function(response) { var jsonData = JSON.parse(response); // user is logged in successfully in the back-end // let's redirect if (jsonData.success == "1") { location.href = 'my_profile.php'; } else { alert('Invalid Credentials!'); } } }); }); }); </script> </body> </html>

Output:

Here's an example of how you can convert the given PHP app to a Next.js app: Copy code `import { useState } from 'react' function LoginForm() { const [username, setUsername] = useState('') const [password, setPassword] = useState('') const [error, setError] = useState('') async function handleSubmit(e) { e.preventDefault() try { const response = await fetch('/api/login', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ username, password }), }) const data = await response.json() if (data.success) { // user is logged in successfully in the back-end // let's redirect window.location.href = '/my_profile' } else { setError('Invalid Credentials!') } } catch (err) { setError(err.message) } } return (
{error &&
{error}
} setUsername(e.target.value)} /> setPassword(e.target.value)} />
) } export default LoginForm` Then, you can create an `api` route in your Next.js app to handle the login request: Copy code `import { NextApiRequest, NextApiResponse } from 'next' export default function login(req: NextApiRequest, res: NextApiResponse) { if (req.method === 'POST') { // do user authentication as per your requirements // ... // ... // based on successful authentication res.json({ success: 1 }) } else { res.json({ success: 0 }) } }` You'll also need to remove the jQuery script and the script that handles the form submission, as that functionality is now being handled in the `LoginForm` component using React hooks. I hope this helps! Let me know if you have any questions.

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