How can I save document library lookup field using REST API Post in a SharePoint list? I tried like


But, it is throwing an error :

{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"A 'PrimitiveValue' node with non-null value was found when trying to read the value of a navigation property; however, a 'StartArray' node, a 'StartObject' node, or a 'PrimitiveValue' node with null value was expected."}}} Bad Request

2 Answers 2


'docItem':'1', simple this should work.. Or you can try 'docItem':1


In REST, adding 'Id' to the column works as long as your specifying the Id.

LookupColumn: "docItem"

"docItemId" : 1

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