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To update a task in Box you will need to call the API with the ID of the task. This API can be used to change the action type of the task, add a message, or change the due date.

Task actions

Box currently supports two types of tasks defined by the action value: review tasks and complete tasks. The type of task determines the possible resolution states a task can be in and the interface shown to a user in the web and mobile apps. A review task starts out in an incomplete state and can be marked as incomplete, approved, or rejected. In the user interface a user is provided with a text box and a pair of buttons to approve or reject the task. A complete task starts out in an incomplete state and can be marked incomplete or completed. Once this task is marked completed, no further changes can be made to the task’s state. In the user interface a user is provided with a text box and a button to mark the task as completed.

Completion rules

A task on a file can be assigned to more than one collaborator on the file, and a task has a completion_rule that can be used to define if all users who’ve been assigned the task (all_assignees) or only one assignee (any_assignee) need to complete the task.
Last modified on August 28, 2026