CODEWITHSUNDEEP
javascriptnode.jsdatabasefirebasegoogle-cloud-firestore
Matteo
Matteo

Reputation: 147

Get document data from Firebase Firestore in Node JS

after not finding anything online, I decided to write here. I need to get all the document in the /user/uid collection in Node JS. When I use the Firebase code it replies like this:

Promise {<pending>}

Please help me!

PS: I don't want to use Firebase Admin SDK and await.

"Full" code

var express = require('express');

const { initializeApp } = require("firebase/app");
const { getDatabase, ref, get, child, set, onValue} = require("firebase/database");
const { getFirestore, collection, getDoc, doc} = require("firebase/firestore");

const firebaseApp = initializeApp(firebaseConfig);

// Get a reference to the database service

var app = express();

const PORT = process.env.PORT || 5050

app.get('/', (req, res) => {
    res.send('This is my demo project')
});

const db = getDatabase();
const firestore = getFirestore();


const document = getDoc(doc(collection(firestore, 'users'), "BW5kylV6rtZXtYibpKGc2m1asRm1"));
  
console.log(document);

//Response: "Promise {<pending>}""

Upvotes: 0

Views: 2476

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83058

Firebase method calls are asynchronous. So for both the Admin SDK or the JS SDK you have to deal with the asynchronicity, either by using then or by using async/await.

If you receive Promise {<pending>} it is because the asynchronous method getDoc returns a Promise and this promise is not fulfilled, but is still pending.

So you need to dive into the documentation on how to use Promises... or the async/await keywords.

In your case, the following will do the trick:

getDoc(doc(collection(firestore, 'users'), "BW5kylV6rtZXtYibpKGc2m1asRm1"))
.then(snap => {
   console.log(snap.data())
})

However, if you write this code for running on a Node server you own, I would recommend to use the Admin SDK.

Upvotes: 1

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