Problem in saving data

every time when I save the data through client side it gives me error 404 mean: Required request body is missing, but when I save data through postman it successfully saves, I don’t understand where the mistake is here is my code, please me out

saveRem(Obj:Reminderdata) {{"name","doctor_name":this.doctor_name,"hospital_clinic":this.hospital_clinic,"date",

    ((result) => {
      console.log(result); Reminderdata();
    }, (err) => {

 on this page, I am passing the patient data, medicine data and then save it into the database.