Получить описание задачи task.item.getdescription

curl -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"TASKID":13,"USERID":1,"auth":"**put_access_token_here**"}' \
https://**put_your_bitrix24_address**/rest/task.item.getdescription

// 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

// TODO: verify API version
// Shape of the payload returned in result
type TaskDescriptionResult = string

try {
  const response = await $b24.actions.v2.call.make<TaskDescriptionResult>({
    method: 'task.item.getdescription',
    params: {
      TASKID: 13,
      USERID: 1,
    },
    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('Task description:', 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 getTaskDescription() {
    try {
      // Initialize the SDK inside a Bitrix24 frame
      const $b24 = await B24Js.initializeB24Frame()

      const response = await $b24.actions.v2.call.make({
        method: 'task.item.getdescription',
        params: {
          TASKID: 13,
          USERID: 1,
        },
        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('Task description:', result)
    } catch (error) {
      // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
      console.error(error)
    }
  }

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

try {
    $response = $b24Service
        ->core
        ->call(
            'task.item.getdescription',
            [13, 1]
        );

    $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 getting task description: ' . $e->getMessage();
}

BX24.callMethod(
    'task.item.getdescription',
    [13, 1],
    function(result)
    {
        console.info(result.data());
        console.log(result);
    }
);

require_once('crest.php');

$result = CRest::call(
    'task.item.getdescription',
    [
        'TASKID' => 13,
        'USERID' => 1
    ]
);

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