Firestore in Firebase functions

Below is the working code for firebase functions crud of notes application that works in firebase emulator can be started with below given command

firebase emulators:start

Below is a sample app -

To start follow below document -

https://firebase.google.com/docs/cli

Then take below functions code for reference -

index.js

import { https, logger } from 'firebase-functions';
import { initializeApp, applicationDefault, cert } from 'firebase-admin/app';
import { getFirestore, Timestamp, FieldValue } from 'firebase-admin/firestore';
import {
  getNotes, 
  // getNote, 
  // updateNote, 
  // deleteNote, 
  // createNote, 
} from './app/notes.js'



initializeApp();
const db = getFirestore();


export const notes = https.onRequest( async (req, res) => {
  // const auth = getAuth(app);
  // const db = getFirestore();


  let result;
  switch(req.method){
    case "GET":
      if(req.url && req.url!=="/"){
        const id = req.url.split("/").pop();
        logger.info(`id ${id}`, {structuredData: true});
        return await getNote({req, db, res, id})
        // break;
      }
      return getNotes({req, db, res})
      // break;
    case "POST":
      result = createNote({req, db, res})
      break;
    case "DELETE":
      result = deleteNote({req, db, res})
      break;
    case "PUT":
      result = updateNote({req, db, res})
      break;
  }
  logger.info(`request ${request.method} not found`, {structuredData: true});
  res.status(404).send('');
});

Notes.js

// import { logger } from 'firebase-functions';
import { collection, query, where, getDocs } from "firebase/firestore";



export const getNote = async ({req, db, id, res}) => {
    const docRef = db.collection('notes').doc(id);
    // logger.info(`id ${id}`, {structuredData: true});
    try {
        const doc = await docRef.get();
        if (!doc.exists) {
          console.log('No such document!');
          return res.status(404).send('Not found');
        } else {
          console.log('Document data:', doc.data());
          return res.status(200).send(doc.data());
        }
    } catch (err) {
        console.log('Error getting document', err);
        return res.status(500).send('Server error');
    }
}


export const getNotes = async ({req, res, db}) => {
    try{
        let result = []
        const snapshot = await db.collection('notes').where('uid', '==', "1").get();
        snapshot.forEach((doc) => result.push(doc.data()));
        console.log("result-->",result);
        res.send(result) 
    } catch (err) {
        console.log('Error getting document', err);
        return res.status(500).send('Server error');
    }
}


// export const createNote = () => {
// const docRef = db.collection('notes').doc('123456');


// await docRef.set({
//   uid: '1',
//   text: 'Lovelace',
// });
// }
// export const deleteNote = () => {
//     return "deleteNote"
// }
// export const updateNote = () => {
//     return "updateNote"
// }