I want to update some property in a SharePoint ListItem.

I'm using this code:

body = '{"__metadata": {"type": "SP.Data.Documentos_x0020_compartidosItem"}, "Tarea": "TP 15"}'
header = {'Authorization': 'Bearer ' + bearer + '', 'Accept': 'application/json;odata=verbose', 'X-HTTP-Method':'MERGE','content-type': 'application/json', 'IF-MATCH'
: '*'}

and I make this call:

requests.post("https://[sharepoint URL]/_api/web/lists/GetByTitle('Documentos')/items(232)",json=body,headers=header).json()

but I get always the same answer:

{'error': {'code': '-1, '
           'message': {'lang': 'es-ES',
                       'value': "Se encontró un nodo 'PrimitiveValue' "
                                'inesperado al leer del lector JSON. Se '
                                "esperaba un nodo 'StartObject'."}}}

Value translation: "An unexpected 'PrimitiveValue' node was found when reading from the JSON reader. It was expected a 'Startobject' node"

Could anyone give me any clue about this issue?

Previously I built similar request on Postman and it worked succesffully: enter image description here

Thanks and kind regards

  • What is the column Type of Tarea? Can you please share the screenshot of your list column types? Feb 6, 2020 at 11:16
  • For sure! it's just a customized column Here you have a screenshot: ibb.co/1T1X5Kx Feb 6, 2020 at 11:35
  • Is Tarea or Zone any of them are lookup columns? Feb 6, 2020 at 11:46
  • I'm not sure enough what you mean with "lookup columns". Sorry, my knowledge about SharePoint is pretty elemental. For me they are either customized or personal columns. How could I confirm that feature? I must say I haven't found any problem to update those customized columns from Postman Feb 6, 2020 at 11:50
  • Kindly share the screenshot of the list settings under which columns are listed. Feb 6, 2020 at 11:51

1 Answer 1


You have your Accept set this way, but in order to POST/PUT/PATCH metadata in that format, your content-type also needs to be set to 'content-type': 'application/json;odata=verbose'.


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