task.item.add

curl -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"fields":{"TITLE":"created via REST API at **current_datetime_here**","RESPONSIBLE_ID":1,"DEADLINE":"2013-05-13T16:06:06+03:00"},"auth":"**put_access_token_here**"}' \
https://**put_your_bitrix24_address**/rest/task.item.add

// This snippet is an ES module: top-level await requires type="module" or a bundler.
// $b24 is an already-initialized SDK instance (see the SDK "Get started" guide).
import { Text } from '@bitrix24/b24jssdk'
import type { B24Frame } from '@bitrix24/b24jssdk'

declare const $b24: B24Frame

// task.item.add returns the ID of the newly created task
// Shape of the payload returned in result (match the "response handling" section of the page)
type TaskItemAddResult = number

try {
  const response = await $b24.actions.v2.call.make<TaskItemAddResult>({
    method: 'task.item.add',
    params: {
      fields: {
        TITLE: 'created via REST API at ' + new Date().toLocaleString(),
        RESPONSIBLE_ID: 1,
        DEADLINE: '2013-05-13T16:06:06+03:00',
      },
    },
    requestId: Text.getUuidRfc4122()
  })

  // The payload is available only on a successful response
  if (!response.isSuccess) {
    console.error(response.getErrorMessages().join('; '))
  } else {
    const result = response.getData()!.result
    console.info('New task ID:', result)
  }
} catch (error) {
  // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
  console.error(error)
}

<!-- Load the SDK (UMD build); it is exposed as the global B24Js -->
<script src="https://unpkg.com/@bitrix24/b24jssdk@1/dist/umd/index.min.js"></script>
<script>
  async function addTaskItem() {
    try {
      // Initialize the SDK inside a Bitrix24 frame
      const $b24 = await B24Js.initializeB24Frame()

      const response = await $b24.actions.v2.call.make({
        method: 'task.item.add',
        params: {
          fields: {
            TITLE: 'created via REST API at ' + new Date().toLocaleString(),
            RESPONSIBLE_ID: 1,
            DEADLINE: '2013-05-13T16:06:06+03:00',
          },
        },
        requestId: B24Js.Text.getUuidRfc4122()
      })

      // The payload is available only on a successful response
      if (!response.isSuccess) {
        console.error(response.getErrorMessages().join('; '))
        return
      }

      const result = response.getData().result
      console.info('New task ID:', result)
    } catch (error) {
      // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
      console.error(error)
    }
  }

  document.addEventListener('DOMContentLoaded', addTaskItem)
</script>

try {
    $dt = new DateTime();
    $response = $b24Service
        ->core
        ->call(
            'task.item.add',
            [
                [
                    'TITLE'         => 'created via REST API at ' . $dt->format('Y-m-d H:i:s'),
                    'RESPONSIBLE_ID' => 1,
                    'DEADLINE'      => '2013-05-13T16:06:06+03:00',
                ],
            ]
        );

    $result = $response
        ->getResponseData()
        ->getResult();

    echo 'Success: ' . print_r($result, true);
    // Нужная вам логика обработки данных
    processData($result);

} catch (Throwable $e) {
    error_log($e->getMessage());
    echo 'Error adding task item: ' . $e->getMessage();
}

var dt = new Date();
BX24.callMethod(
    'task.item.add',
    [{TITLE: 'created via REST API at ' + dt.toLocaleString(), RESPONSIBLE_ID: 1, DEADLINE: '2013-05-13T16:06:06+03:00'}],
    function(result)
    {
        console.info(result.data());
        console.log(result);
    }
);

require_once('crest.php');

$dt = new DateTime();
$title = 'created via REST API at ' . $dt->format('Y-m-d H:i:s');

$result = CRest::call(
    'task.item.add',
    [
        'fields' => [
            'TITLE' => $title,
            'RESPONSIBLE_ID' => 1,
            'DEADLINE' => '2013-05-13T16:06:06+03:00'
        ]
    ]
);

echo '<PRE>';
print_r($result);
echo '</PRE>';