React Js Post Checkbox data to API

<!DOCTYPE html>
<html>
  <head>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.development.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
  </head>

<body>
    <div id="app"></div>
    <script type="text/babel">
      const { useState } = React;
      const App = () => {
        const [selectedRivers, setSelectedRivers] = useState([]);

const rivers = [
          { id: 1, name: "Ganga" },
          { id: 2, name: "Yamuna" },
          { id: 3, name: "Brahmaputra" },
          { id: 4, name: "Godavari" },
          { id: 5, name: "Krishna" },
          { id: 6, name: "Narmada" },
          { id: 7, name: "Tapti" },
          { id: 8, name: "Mahanadi" },
          // Add more rivers as needed
        ];

return (
          <div className="container">
            <h3>React Js post checkbox data to API </h3>
            <form onSubmit={handleSubmit}>
              {rivers.map((river) => (
                <div key={river.id}>
                  <label>
                    <input
                      type="checkbox"
                      value={river.name}
                      checked={selectedRivers.includes(river.name)}
                      onChange={handleCheckboxChange}
                    />
                    {river.name}
                  </label>
                </div>
              ))}
              <button type="submit">Submit</button>
            </form>
          </div>
        );
      };

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
      .container {
        max-width: 400px;
        margin: 0 auto;
        padding: 20px;
        background-color: #f2f2f2;
        border-radius: 8px;
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      }

.container h3 {
        font-size: 20px;
        margin-bottom: 16px;
      }

.container form {
        display: flex;
        flex-direction: column;
      }

.container label {
        display: flex;
        align-items: center;
        margin-bottom: 8px;
      }

.container input[type="checkbox"] {
        margin-right: 8px;
      }

.container button {
        padding: 8px 16px;
        font-size: 16px;
        background-color: #4caf50;
        color: #fff;
        border: none;
        border-radius: 4px;
        cursor: pointer;
      }

.container button:hover {
        background-color: #45a049;
      }

.container button:disabled {
        background-color: #cccccc;
        cursor: not-allowed;
      }
    </style>
  </body>
</html>