how to send data in firebase without generating uniq id in firestore

enter code hereenter image description here enter code here const [allData, setAllData] = useState({}) const [userData, setUserData] = useState({ no: "", url: "", supporturl: "", support: "", whatsapp: "",

});

const { no } = userData;

setAllData({ ...allData, no: no })

const res = fetch("https://j-kik-3f4e1-default-rtdb.firebaseio.com/userDataRecords.json",
      {

    method: "POST",
    headers: {
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
      allData
    })

  }
)
if (res) {
  setUserData({
    // no:"",

  })
  alert('Number Saved successfully')


} else {
  alert('Number Saved error')
}

}?