tasks.task.update

curl -X POST \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-d '{"id":11,"fields":{"title":"Название задачи","deadline":"2025-12-31T23:59:59+02:00","creatorId":29,"responsibleId":1,"crmItemIds":["L_1000959"]},"auth":"**put_access_token_here**"}' \
https://**put_your_bitrix24_address**/rest/api/tasks.task.update

// 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

// Shape of the payload returned in result (match the "response handling" section of the page)
type TaskUpdateResult = {
  result: boolean
}

try {
  const response = await $b24.actions.v3.call.make<TaskUpdateResult>({
    method: 'tasks.task.update',
    params: {
      id: 11,
      fields: {
        title: 'Task title',
        deadline: '2025-12-31T23:59:59+02:00',
        creatorId: 29,
        responsibleId: 1,
        crmItemIds: ['L_1000959'],
      },
    },
    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 updated:', result.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 updateTask() {
    try {
      // Initialize the SDK inside a Bitrix24 frame
      const $b24 = await B24Js.initializeB24Frame()

      const response = await $b24.actions.v3.call.make({
        method: 'tasks.task.update',
        params: {
          id: 11,
          fields: {
            title: 'Task title',
            deadline: '2025-12-31T23:59:59+02:00',
            creatorId: 29,
            responsibleId: 1,
            crmItemIds: ['L_1000959'],
          },
        },
        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 updated:', result.result)
    } catch (error) {
      // Thrown on transport or SDK failures (AjaxError, SdkError, etc.)
      console.error(error)
    }
  }

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

from b24pysdk.errors import BitrixAPIError, BitrixSDKException

fields = {
    "title": "Название задачи",
    "deadline": "2025-12-31T23:59:59+02:00",
    "creatorId": 29,
    "responsibleId": 1,
    "crmItemIds": [
        "L_1000959",
    ],
}

try:
    bitrix_response = client.tasks.task.update(
        bitrix_id=11,
        fields=fields,
    ).response
    result = bitrix_response.result
    print(result)
except BitrixAPIError as error:
    print(
        "Ошибка Bitrix API",
        f"error: {error.error}",
        f"error_description: {error.error_description}",
        sep="\n",
    )
except BitrixSDKException as error:
    print(f"Ошибка Bitrix SDK: {error.message}")
except Exception as error:
    print(f"Непредвиденная ошибка: {error}")

try {
    $response = $b24Service
        ->core
        ->call(
            'tasks.task.update',
            [
                'id' => 11,
                'fields' => [
                    'title' => 'Название задачи',
                    'deadline' => '2025-12-31T23:59:59+02:00',
                    'creatorId' => 29,
                    'responsibleId' => 1,
                    'crmItemIds' => ['L_1000959'],
                ]
            ]
        );

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

    echo 'Success: ' . print_r($result, true);

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

BX24.callMethod(
    'tasks.task.update',
    {
        id: 11,
        fields: {
            title: 'Название задачи',
            deadline: '2025-12-31T23:59:59+02:00',
            creatorId: 29,
            responsibleId: 1,
            crmItemIds: ['L_1000959']
        }
    },
    function(result){
        console.info(result.data());
        console.log(result);
    }
);

require_once('crest.php');

$result = CRest::call(
    'tasks.task.update',
    [
        'id' => 11,
        'fields' => [
            'title' => 'Название задачи',
            'deadline' => '2025-12-31T23:59:59+02:00',
            'creatorId' => 29,
            'responsibleId' => 1,
            'crmItemIds' => ['L_1000959']
        ]
    ]
);

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

// client и ctx уже созданы — см. раздел «SDK для Go»
res, err := client.Core().Call(ctx, "tasks.task.update", b24.Params{
	"id": 11,
	"fields": b24.Params{
		"title":         "Название задачи",
		"deadline":      "2025-12-31T23:59:59+02:00",
		"creatorId":     29,
		"responsibleId": 1,
		"crmItemIds":    []string{"L_1000959"},
	},
})
if err != nil {
	return fmt.Errorf("tasks.task.update: %w", err)
}

var item struct {
	Result bool `json:"result"`
}
if err := json.Unmarshal(res.Result, &item); err != nil {
	return fmt.Errorf("разбор ответа: %w", err)
}
fmt.Println(item.Result)