Question 120851 in Firebase Question posted in
An extensive official documentation can be found here.

Firebase – Converting JSON to Array with Cloud Functions

When I use this function I get the following result from my realtime database. It looks like a json object.
How can I turn that to an array or retrieve the string userName? snapshot.userName is not working.

const functions = require('firebase-functions');
const admin = require('firebase-admin');

admin.initializeApp();

   exports.Push = functions.database.ref('/placeID/{pushId}/')
   .onCreate((snapshot, context) => {
 
      console.log(snapshot)    
   })

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2

Answers


  1. 0

    A Realtime Database DataSnapshot object is a container that contains your data. To get the data it contains, you need to retrieve its value using the val() method:

    console.log(snapshot.val());

    To get the userName from your data, you can use either:

    console.log(snapshot.val().userName)
// note: if "userName" is missing, this will log `undefined`

    or

    // more useful with large snapshots
console.log(snapshot.child("userName").val())
// note: if "userName" is missing, this will log `null`

    See following link for more info about the DataSnapshot object and available methods/properties:
    https://firebase.google.com/docs/reference/functions/providers_database.datasnapshot

    Added note: The DataSnapshot class overrides the toJSON() method, this is why when you log it, you saw the data it contained rather than the DataSnapshot’s own methods/properties.

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  2. 0

    snapshot is a reference to a Firestore document. In order to get the data contained in a document doc you need to call doc.data(). So in your case it would be doc.data().userName.

    See the documentation for some examples.

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