 <br><br>
        </div>

        <input type="submit" value="Submit">
    </form>

    <h2>Response:</h2>
    <div id="responseData"></div> <!-- This div will display the response data -->

    <script>
        const form = document.getElementById('backendForm');
        const actionSelect = document.getElementById('action');
        const keyField = document.getElementById('keyField');
        const responseDataDiv = document.getElementById('responseData');

        actionSelect.addEventListener('change',