updateDoc, doc

To update some fields of a document without overwriting the entire document, use the update() method:

react js/native

import { doc, updateDoc } from "firebase/firestore";

const washingtonRef = doc(db, "cities", "DC");

// Set the "capital" field of the city 'DC'
await updateDoc(washingtonRef, {
  capital: true
});

node.js

const cityRef = db.collection('cities').doc('DC');

// Set the 'capital' field of the city
const res = await cityRef.update({capital: true});