Anmeldeformular mit reactjs erstellen
Sure, here's a basic example of how you can create a login form using Node.js and Express.js:

First, install the necessary dependencies by running npm install express body-parser in your project directory.

Then, create a new file called app.js and add the following code:

javascript

const express = require('express');
const bodyParser = require('body-parser');

const app = express();

app.use(bodyParser.urlencoded({ extended: true }));

app.get('/', (req, res) => {
  res.send(`
    <h1>Login</h1>
    <form method="POST" action="/login">
      <div>
        <label>Username:</label>
        <input type="text" name="username" required>
      </div>
      <div>
        <label>Password:</label>
        <input type="password" name="password" required>
      </div>
      <button type="submit">Login</button>
    </form>
  `);
});

app.post('/login', (req, res) => {
  const { username, password } = req.body;
  // Check if the username and password are correct
  if (username === 'myusername' && password === 'mypassword') {
    res.send('<h1>Login Successful!</h1>');
  } else {
    res.send('<h1>Login Failed!</h1>');
  }
});

const PORT = 3000;
app.listen(PORT, () => {
  console.log(`Server listening on port ${PORT}`);
});

This code sets up an Express.js server and defines two routes:

    A GET route for the homepage that displays the login form.
    A POST route for the login form that checks the submitted username and password and responds with a success or failure message.

The body-parser middleware is used to parse the form data sent from the client.

To run this example, save the app.js file and start the server by running node app.js in your terminal. Then open your web browser and navigate to http://localhost:3000 to see the login form.

Note that this is a very basic example and does not include any security features such as encryption or session management. In a real-world application, you would want to implement additional security measures to protect the login information.