Error writing to google spreadsheet using google api spreadsheet (javascript)

Question

I tried to embed the Google Sheets API in js and the read function works fine, but when I try to write something in a spreadsheet, I get the following error. Here is a snippet: -

PS: this is my first stack overflow question, so try to ignore any errors

 var values = [
     [
       "CO16338","CO16331","CO16330" ],
   ];
   var body = {
     values: values
   };
   gapi.client.sheets.spreadsheets.values.update({
      spreadsheetId:'1k1s95YiuWMjeOCMmpj8DQaj705ZC6Uq4UC7pEEU0zko',
      range:'!G1:G5',
      valueInputOption:"RAW",
      resource: body
   }).then((response) => {
     var result = response.result;
     console.log(`${result.updatedCells} cells updated.`);
   });

Error, detail:

{  "error": {
"code": 400,
"message": "Invalid JSON payload received. Unknown name \"valueInputOption\": Cannot bind query parameter. Field 'valueInputOption' could not be found in request message.",
"status": "INVALID_ARGUMENT",
"details": [
  {
    "@type": "type.googleapis.com/google.rpc.BadRequest",
    "fieldViolations": [
      {
        "description": "Invalid JSON payload received. Unknown name \"valueInputOption\": Cannot bind query parameter. Field 'valueInputOption' could not be found in request message."
      }
    ]
  }
]}}