source: my-react-app/src/components/Login.js

import React, { useState } from 'react';
import axios from 'axios';
import {useNavigate} from "react-router-dom";

const Login = ({ onLogin }) => {
    const navigate = useNavigate();
    const [credentials, setCredentials] = useState({ username: '', password: '' });
    const [error, setError] = useState('');

    const handleChange = (e) => {
        const { name, value } = e.target;
        setCredentials({ ...credentials, [name]: value });
    };

    const handleSubmit = async (e) => {
        e.preventDefault();
        try {
            const response = await axios.post('http://localhost:8081/api/login', {
                email: credentials.username,
                password: credentials.password
            });
            const { token } = response.data;

            localStorage.setItem('token', token);

            navigate("/")
        } catch (error) {
            console.error('Login failed:', error);
            setError('Login failed. Please check your credentials and try again.');
        }
    };

    return (
        <div>
            <h2>Login</h2>
            <form onSubmit={handleSubmit}>
                <div>
                    <label>Username:</label>
                    <input
                        type="text"
                        name="username"
                        value={credentials.username}
                        onChange={handleChange}
                    />
                </div>
                <div>
                    <label>Password:</label>
                    <input
                        type="password"
                        name="password"
                        value={credentials.password}
                        onChange={handleChange}
                    />
                </div>
                {error && <div style={{ color: 'red' }}>{error}</div>}
                <button type="submit">Login</button>
            </form>
        </div>
    );
};

export default Login;