#script i used in google sheet app scripter
function doGet(request) {
var sheet =SpreadsheetApp.openById("sheetid");
var values =sheet.getActiveSheet().getDataRange().getValues();
var data=[];
try{
var marker_name=request.parameter.marker_name;
var marker_id=request.parameter.marker_id;
var x=request.parameter.x;
var y=request.parameter.y;
var rowData=sheet.appendRow([marker_name,marker_id,x,y]);
}catch(exc){
}
for (var i =1;i<values.length;i++)
{
var row=values[i];
var getdata ={};
getdata['marker_name']=row[0]
getdata['marker_id']=row[1]
getdata['x']=row[2]
getdata['y']=row[3]
data.push(getdata);
}
return ContentService.createTextOutput(JSON.stringify(data)).setMimeType(ContentService.MimeType.JSON);
}