json - Invalid property identifier character: \\. Path '', line 1, position 1 in postman -

i passing string whithin service header.

formdata = "{\"leaveentrycode\":0,\"requestid\":0,\"employeecode\":17227,\"leaveyear\":2016,\"leavetypecode\":1,\"basetype\":\"ess\",\"startdate\":\"2016-08-2t00:00:00\",\"enddate\":\"2016-08-2t00:00:00\",\"noofdays\":1.0,\"startdatesession\":\"full\",\"enddatesession\":\"half\",\"preapproved\":false,\"fordate\":\"1901-01-01t00:00:00\",\"remarks\":\"test\",\"requeststatus\":\"p\",\"deleted\":false,\"status\":false,\"createdby\":0,\"createddate\":\"0001-01-01t00:00:00\",\"updatedby\":0,\"updateddate\":\"0001-01-01t00:00:00\",\"deletedby\":0,\"deleteddate\":\"0001-01-01t00:00:00\",\"moduleid\":2,\"objectid\":20,\"startdatestring\":\"08/2/2016\",\"enddatestring\":\"08/2/2016\",\"leavedaylist\":[\"08/02/2016-fh,08/02/2016-sh\"],\"systemleavetypecode\":\"ann\",\"leavetypename\":\"annual\",\"employee\":\"\",\"lieudaylist\":null,\"leavereasoncode\":0,\"coveringpersoncode\":0,\"attacheddocument\":null,\"baseleavetype\":\"ann\",\"coveringpersonname\":null,\"leavereasonname\":null,\"documentsource\":\"leave\"}"; 

this formdata header name. getting error in postman

  "message": "an error has occurred.",   "exceptionmessage": "invalid property identifier character: \\. path '', line 1, position 1.",   "exceptiontype": "newtonsoft.json.jsonreaderexception",   "stacktrace": "   @ newtonsoft.json.jsontextreader.pars 

what reson this? please me. thanks

select type raw , content json , copy below json in body.

{ "leaveentrycode": 0, "requestid": 0, "employeecode": 17227, "leaveyear": 2016, "leavetypecode": 1, "basetype": "ess", "startdate": "2016-08-2t00:00:00", "enddate": "2016-08-2t00:00:00", "noofdays": 1.0, "startdatesession": "full", "enddatesession": "half", "preapproved": false, "fordate": "1901-01-01t00:00:00", "remarks": "test", "requeststatus": "p", "deleted": false, "status": false, "createdby": 0, "createddate": "0001-01-01t00:00:00", "updatedby": 0, "updateddate": "0001-01-01t00:00:00", "deletedby": 0, "deleteddate": "0001-01-01t00:00:00", "moduleid": 2, "objectid": 20, "startdatestring": "08/2/2016", "enddatestring": "08/2/2016", "leavedaylist": ["08/02/2016-fh,08/02/2016-sh"], "systemleavetypecode": "ann", "leavetypename": "annual", "employee": "", "lieudaylist": null, "leavereasoncode": 0, "coveringpersoncode": 0, "attacheddocument": null, "baseleavetype": "ann", "coveringpersonname": null, "leavereasonname": null, "documentsource": "leave" }