Update Task tasks.task.update

Scope: task

Who can execute the method:

any user with access to edit the task

task Creator

The method tasks.task.update updates a task.

Method Parameters

Required parameters are marked with *

Name
type

Description

taskId*
integer

Task identifier.

The task identifier can be obtained when creating a new task or by using the get task list method

fields*
object

Values of task fields. At least one field must be provided in the parameter; otherwise, the method will return an error.

You can pass the SE_PARAMETER parameter to the method — a list of objects with additional task parameters. Possible values for the CODE codes:

1 — deadlines are determined by the deadlines of subtasks
2 — automatically complete the task when subtasks are completed (and vice versa)
3 — do not complete the task without a result

SE_PARAMETER: [
            {
                VALUE: 'Y',
                CODE: 3
            },
            {
                VALUE: 'Y',
                CODE: 2
            }
        ]

Code Examples

How to Use Examples in Documentation

cURL (Webhook)

cURL (OAuth)

PHP

BX24.js

PHP CRest

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"taskId":11,"fields":{"UF_CRM_TASK":["L_4","C_7","CO_5","D_10"],"UF_TASK_WEBDAV_FILES":["n12345","n67890"],"RESPONSIBLE_ID":123}}' \
        https://**put_your_bitrix24_address**/rest/**put_your_user_id_here**/**put_your_webhook_here**/tasks.task.update

curl -X POST \
        -H "Content-Type: application/json" \
        -H "Accept: application/json" \
        -d '{"taskId":11,"fields":{"UF_CRM_TASK":["L_4","C_7","CO_5","D_10"],"UF_TASK_WEBDAV_FILES":["n12345","n67890"],"RESPONSIBLE_ID":123},"auth":"**put_access_token_here**"}' \
        https://**put_your_bitrix24_address**/rest/tasks.task.update

try
        {
        	const response = await $b24.callMethod(
        		"tasks.task.update",
        		{
        			taskId: 11, // Identifier of the task you want to update
        			fields: {
        				// Example of passing multiple values in the UF_CRM_TASK field
        				UF_CRM_TASK: [
        					"L_4", // Link to lead with id 4
        					"C_7", // Link to contact with id 7
        					"CO_5", // Link to company with id 5
        					"D_10" // Link to deal with id 10
        				],
        				// Example of passing multiple files in the UF_TASK_WEBDAV_FILES field
        				UF_TASK_WEBDAV_FILES: [
        					"n12345", // Identifier of the first disk file
        					"n67890" // Identifier of the second disk file
        				],
        				RESPONSIBLE_ID: 123 // Identifier of the new Participant
        			}
        		}
        	);
        	
        	const result = response.getData().result;
        	console.info("Task successfully updated");
        }
        catch( error )
        {
        	console.error(error);
        }

try {
            $response = $b24Service
                ->core
                ->call(
                    'tasks.task.update',
                    [
                        'taskId' => 11, // Identifier of the task you want to update
                        'fields' => [
                            // Example of passing multiple values in the UF_CRM_TASK field
                            'UF_CRM_TASK' => [
                                'L_4', // Link to lead with id 4
                                'C_7', // Link to contact with id 7
                                'CO_5', // Link to company with id 5
                                'D_10' // Link to deal with id 10
                            ],
                            // Example of passing multiple files in the UF_TASK_WEBDAV_FILES field
                            'UF_TASK_WEBDAV_FILES' => [
                                'n12345', // Identifier of the first disk file
                                'n67890' // Identifier of the second disk file
                            ],
                            'RESPONSIBLE_ID' => 123 // Identifier of the new Participant
                        ]
                    ]
                );
        
            $result = $response
                ->getResponseData()
                ->getResult();
        
            echo 'Task successfully updated';
        
        } catch (Throwable $e) {
            error_log($e->getMessage());
            echo 'Error updating task: ' . $e->getMessage();
        }

 BX24.callMethod(
             "tasks.task.update",
             {
                 taskId: 11, // Identifier of the task you want to update
                 fields: {
                     // Example of passing multiple values in the UF_CRM_TASK field
                     UF_CRM_TASK: [
                         "L_4", // Link to lead with id 4
                         "C_7", // Link to contact with id 7
                         "CO_5", // Link to company with id 5
                         "D_10" // Link to deal with id 10
                     ],
                     // Example of passing multiple files in the UF_TASK_WEBDAV_FILES field
                     UF_TASK_WEBDAV_FILES: [
                         "n12345", // Identifier of the first disk file
                         "n67890" // Identifier of the second disk file
                     ],
                     RESPONSIBLE_ID: 123 // Identifier of the new Participant
                 }
             },
             function(result) {
                 if (result.error()) {
                     console.error(result.error());
                 } else {
                     console.info("Task successfully updated");
                 }
             }
         );

require_once('crest.php');
        
        $result = CRest::call(
            'tasks.task.update',
            [
                'taskId' => 11, // Identifier of the task you want to update
                'fields' => [
                    // Example of passing multiple values in the UF_CRM_TASK field
                    'UF_CRM_TASK' => [
                        'L_4', // Link to lead with id 4
                        'C_7', // Link to contact with id 7
                        'CO_5', // Link to company with id 5
                        'D_10' // Link to deal with id 10
                    ],
                    // Example of passing multiple files in the UF_TASK_WEBDAV_FILES field
                    'UF_TASK_WEBDAV_FILES' => [
                        'n12345', // Identifier of the first disk file
                        'n67890' // Identifier of the second disk file
                    ],
                    'RESPONSIBLE_ID' => 123 // Identifier of the new Participant
                ]
            ]
        );
        
        if (isset($result['error'])) {
            echo 'Error: ' . $result['error_description'];
        } else {
            echo 'Task successfully updated';
        }

Response Handling

HTTP Status: 200

{
            "result": {
                "task": {
                    "id": "8157",
                    "title": "Task Example",
                    "description": "Task description with [B]formatting[/B]",
                    "description": "",
                    "mark": null,
                    "priority": "1",
                    "multitask": "N",
                    "notViewed": "N",
                    "replicate": "N",
                    "stageId": "0",
                    "sprintId": null,
                    "backlogId": null,
                    "createdBy": "503",
                    "createdDate": "2025-10-06T17:40:12+02:00",
                    "responsibleId": "503",
                    "changedBy": "503",
                    "changedDate": "2025-10-07T16:32:02+02:00",
                    "statusChangedBy": "503",
                    "closedBy": "0",
                    "closedDate": null,
                    "activityDate": "2025-10-07T16:29:55+02:00",
                    "dateStart": null,
                    "deadline": "2025-12-31T23:59:00+02:00",
                    "startDatePlan": "2024-11-02T11:06:00+02:00",
                    "endDatePlan": "2024-11-02T19:06:00+02:00",
                    "guid": "{1a90e51d-5423-4c1e-b1a2-664a519b4612}",
                    "xmlId": null,
                    "commentsCount": "4",
                    "serviceCommentsCount": "4",
                    "allowChangeDeadline": "N",
                    "allowTimeTracking": "N",
                    "taskControl": "N",
                    "addInReport": "N",
                    "forkedByTemplateId": null,
                    "timeEstimate": "0",
                    "timeSpentInLogs": null,
                    "matchWorkTime": "N",
                    "forumTopicId": "1439",
                    "forumId": "11",
                    "siteId": "s1",
                    "subordinate": "Y",
                    "exchangeModified": null,
                    "exchangeId": null,
                    "outlookVersion": "8",
                    "viewedDate": "2025-10-07T16:30:34+02:00",
                    "sorting": null,
                    "durationFact": null,
                    "isMuted": "N",
                    "isPinned": "N",
                    "isPinnedInGroup": "N",
                    "flowId": null,
                    "descriptionInBbcode": "Y",
                    "status": "2",
                    "statusChangedDate": "2025-10-07T16:22:24+02:00",
                    "durationPlan": "0",
                    "durationType": "days",
                    "favorite": "N",
                    "groupId": "0",
                    "auditors": ["503", "547"],
                    "accomplices": [],
                    "checklist": [],
                    "group": [],
                    "creator": {
                        "id": "503",
                        "name": "Maria Johnson",
                        "link": "/company/personal/user/503/",
                        "icon": "https://mysite.com/b17053/resize_cache/45749/c0120a8d7c10d63c83e32398d1ec4d9e/main/c89/c89c6b7301880958ea704b5a8470635c/4R5A1256.png",
                        "workPosition": "Administrator"
                    },
                    "responsible": {
                        "id": "503",
                        "name": "Maria Johnson",
                        "link": "/company/personal/user/503/",
                        "icon": "https://mysite.com/b17053/resize_cache/45749/c0120a8d7c10d63c83e32398d1ec4d9e/main/c89/c89c6b7301880958ea704b5a8470635c/4R5A1256.png",
                        "workPosition": "Administrator"
                    },
                    "accomplicesData": [],
                    "auditorsData": {
                        "547": {
                            "id": "547",
                            "name": "Helen",
                            "link": "/company/personal/user/547/",
                            "icon": "/bitrix/images/tasks/default_avatar.png",
                            "workPosition": "Lawyer"
                        }
                    },
                    "newCommentsCount": 0,
                    "action": {
                        "accept": false,
                        "decline": false,
                        "complete": true,
                        "approve": false,
                        "disapprove": false,
                        "start": true,
                        "pause": false,
                        "delegate": true,
                        "remove": true,
                        "edit": true,
                        "defer": true,
                        "renew": false,
                        "create": true,
                        "changeDeadline": true,
                        "checklistAddItems": true,
                        "addFavorite": true,
                        "deleteFavorite": false,
                        "rate": true,
                        "take": false,
                        "edit.originator": false,
                        "checklist.reorder": true,
                        "elapsedtime.add": true,
                        "dayplan.timer.toggle": false,
                        "edit.plan": true,
                        "checklist.add": true,
                        "favorite.add": true,
                        "favorite.delete": false
                    },
                    "checkListTree": {
                        "nodeId": 0,
                        "fields": {
                            "id": null,
                            "copiedId": null,
                            "entityId": null,
                            "userId": 503,
                            "createdBy": null,
                            "parentId": null,
                            "title": "",
                            "sortIndex": null,
                            "displaySortIndex": "",
                            "isComplete": false,
                            "isImportant": false,
                            "completedCount": 0,
                            "members": [],
                            "attachments": [],
                            "nodeId": null
                        },
                        "action": [],
                        "descendants": []
                    },
                    "checkListCanAdd": true
                }
            },
            "time": {
                "start": 1759843922,
                "finish": 1759843922.725389,
                "duration": 0.7253890037536621,
                "processing": 0,
                "date_start": "2025-10-07T16:32:02+02:00",
                "date_finish": "2025-10-07T16:32:02+02:00",
                "operating_reset_at": 1759844522,
                "operating": 0.4929828643798828
            }
        }

Returned Data

Name `type`	Description
result `object`	Object with response data
task `object`	Object with task description after the operation is performed
time `time`	Information about the request execution time

Error Handling

HTTP Status: 400

{
            "error": "ERROR_CORE",
            "error_description": "Cannot bind the node to itself\u003Cbr\u003E"
        }

Name `type`	Description
error `string`	String error code. It may consist of digits, Latin letters, and underscores
error_description `error_description`	Textual description of the error. The description is not intended to be shown to the end user in its raw form

Possible Error Codes

Code	Description	Value
`0`	wrong task id	The value in the `taskId` parameter is of an incorrect type
`100`	CTaskItem All parameters in the constructor must have real class type (internal error)	The required parameter `taskId` is missing
`0`	Action on the task is not allowed (internal error)	The user does not have permission to update the task or does not have access to the task
`100`	Could not find value for parameter {fields} (internal error)	The `fields` parameter is missing or empty
`ERROR_CORE`	The user specified in the "Responsible" field was not found\u003Cbr\u003E	The `RESPONSIBLE_ID` field contains the identifier of a non-existent user
`ERROR_CORE`	Invalid status\u003Cbr\u003E	An incorrect value is specified in the `STATUS` field
`ERROR_CORE`	The task specified in the "Parent Task" field was not found\u003Cbr\u003E	The `PARENT_ID` field contains the identifier of a non-existent task
`ERROR_CORE`	Cannot bind the node to itself\u003Cbr\u003E	The `PARENT_ID` field contains the identifier of the same task as in the `taskId` parameter
`ERROR_CORE`	Creating cyclic links in tasks is prohibited\u003Cbr\u003E	The `PARENT_ID` field contains the identifier of a subtask `taskId`. A subtask cannot become a parent task
`ERROR_CORE`	The end date specified in the scheduling is earlier than the start date\u003Cbr\u003E	The date and time in the `END_DATE_PLAN` field is earlier than in `START_DATE_PLAN`
`ERROR_CORE`	The duration of the task specified in the scheduling is too long\u003Cbr\u003E	The value in the `END_DATE_PLAN` field specifies a date that is too far in the future

Statuses and System Error Codes

HTTP Status: 20x, 40x, 50x

The errors described below may occur when calling any method.

Status	Code Error Message	Description
`500`	`INTERNAL_SERVER_ERROR` Internal server error	An internal server error has occurred, please contact the server administrator or Bitrix24 technical support
`500`	`ERROR_UNEXPECTED_ANSWER` Server returned an unexpected response	An internal server error has occurred, please contact the server administrator or Bitrix24 technical support
`503`	`QUERY_LIMIT_EXCEEDED` Too many requests	The request intensity limit has been exceeded
`405`	`ERROR_BATCH_METHOD_NOT_ALLOWED` Method is not allowed for batch usage	The current method is not allowed to be called using batch
`400`	`ERROR_BATCH_LENGTH_EXCEEDED` Max batch length exceeded	The maximum length of parameters passed to the batch method has been exceeded
`401`	`NO_AUTH_FOUND` Wrong authorization data	Invalid access token or webhook code
`400`	`INVALID_REQUEST` Https required	The methods must be called using the HTTPS protocol
`503`	`OVERLOAD_LIMIT` REST API is blocked due to overload	The REST API is blocked due to overload. This is a manual individual block, to remove it you need to contact Bitrix24 technical support
`403`	`ACCESS_DENIED` REST API is available only on commercial plans	The REST API is available only on commercial plans
`403`	`INVALID_CREDENTIALS` Invalid request credentials	The user whose access token or webhook was used to call the method lacks permissions
`404`	`ERROR_MANIFEST_IS_NOT_AVAILABLE` Manifest is not available	The manifest is not available
`403`	`insufficient_scope` The request requires higher privileges than provided by the webhook token	The request requires higher privileges than those provided by the webhook token
`401`	`expired_token` The access token provided has expired	The provided access token has expired
`403`	`user_access_error` The user does not have access to the application	The user does not have access to the application. This means that the application is installed, but the account administrator has allowed access to this application only for specific users
`500`	`PORTAL_DELETED` Portal was deleted	The public part of the site is closed. To open the public part of the site on an on-premise installation, disable the option "Temporary closure of the public part of the site". Path to the setting: Desktop > Settings > Product Settings > Module Settings > Main Module > Temporary closure of the public part of the site

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Add Task

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Update Task tasks.task.update

Method ParametersMethod Parameters

Code ExamplesCode Examples

Response HandlingResponse Handling

Returned DataReturned Data

Error HandlingError Handling

Possible Error CodesPossible Error Codes

Statuses and System Error CodesStatuses and System Error Codes

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