Clearing Person/Group Values

To clear out or empty the values in person or group columns, how you do it depends on if the column is single-value or multi-value.

For single-value person columns, all you have to do is set the value to -1.

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" ]{'__metadata':{'type':'SP.Data.TestListListItem'}, 'Title':'My title', 'SinglePersonColumnId':-1, 'MultiPersonColumnId':{'results':[9,12]}}

It requires an integer value, so null or empty string will give you an error: Cannot convert a primitive value to the expected type ‘Edm.Int32′.

For multi-value person columns, you have to set the results value to an empty array:

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" ]{'__metadata':{'type':'SP.Data.TestListListItem'}, 'Title':'My title', 'SinglePersonColumnId':-1, 'MultiPersonColumnId':{'results':[0]}}

Cannot convert the literal ‘1’ to the expected type ‘Edm.String’ - REST API

If getting this error make sure you are giving quotation marks to your input passed in the request.

JSON Data - 

data={name="John", age=30}

if you are expecting age as a string parameter then it return error saying can not convert the literal '30' to the expected type  ‘Edm.String’

to resolve this use below

data={ name="John", age="30"}

in your http request.