Update Custom Column of Task in Project Online using JSOM

Below code will show you how to update custom column of Task in Project Online using JavaScript Object Model

For Lookup values update is as follows:

To get the internal name of a Task Custom Field below is the endpoint.

Reference Link: http://sharepoint.stackexchange.com/questions/118695/update-custom-field-in-task-project-online

Note: This code will update the project plan without going to approval center

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