Introduction to Firebase Admin SDK

The Firebase Admin SDK allows you to integrate advanced Firebase features and tools into your applications, automating many common tasks and extending the functionality of Firebase. This guide covers dozens of useful APIs with code snippets to help you get started.

Setting Up Firebase Admin SDK

  
  // Import the Firebase Admin SDK
  var admin = require('firebase-admin');
  
  // Initialize the app
  var serviceAccount = require('path/to/serviceAccountKey.json');
  
  admin.initializeApp({
    credential: admin.credential.cert(serviceAccount)
  });
  

APIs for Authentication

Create a New User

  
  admin.auth().createUser({
    email: "user@example.com",
    emailVerified: false,
    phoneNumber: "+1234567890",
    password: "password",
    displayName: "John Doe",
    photoURL: "http://www.example.com/12345678/photo.png",
    disabled: false
  })
  .then((userRecord) => {
    console.log('Successfully created new user:', userRecord.uid);
  })
  .catch((error) => {
    console.log('Error creating new user:', error);
  });
  

Verify User Token

  
  admin.auth().verifyIdToken(idToken)
  .then((decodedToken) => {
    const uid = decodedToken.uid;
    // Further processing with UID
  })
  .catch((error) => {
    console.log('Error verifying token:', error);
  });
  

APIs for Firestore

Add Data to Firestore

  
  var db = admin.firestore();
  
  var docRef = db.collection('users').doc('alovelace');
  
  var setAda = docRef.set({
    first: 'Ada',
    last: 'Lovelace',
    born: 1815
  });
  

Read Data from Firestore

  
  var docRef = db.collection('users').doc('alovelace');
  
  docRef.get().then((doc) => {
    if (doc.exists) {
      console.log("Document data:", doc.data());
    } else {
      console.log("No such document!");
    }
  }).catch((error) => {
    console.log("Error getting document:", error);
  });
  

APIs for Realtime Database

Write Data

  
  var db = admin.database();
  var ref = db.ref("server/saving-data/fireblog");
  
  var usersRef = ref.child("users");
  usersRef.set({
    alanisawesome: {
      date_of_birth: "June 23, 1912",
      full_name: "Alan Turing"
    },
    gracehop: {
      date_of_birth: "December 9, 1906",
      full_name: "Grace Hopper"
    }
  });
  

Read Data

  
  var ref = db.ref("server/saving-data/fireblog/users");
  ref.once("value", function(snapshot) {
    console.log(snapshot.val());
  });
  

Full Application Example

  
  var admin = require('firebase-admin');
  var serviceAccount = require('path/to/serviceAccountKey.json');
  
  admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    databaseURL: "https://.firebaseio.com"
  });
  
  // Create a new user
  admin.auth().createUser({
    email: "user@example.com",
    password: "password",
    displayName: "John Doe"
  }).then((userRecord) => {
    console.log('Successfully created new user:', userRecord.uid);
    
    // Add user data to Firestore
    var db = admin.firestore();
    var userRef = db.collection('users').doc(userRecord.uid);
    userRef.set({
      displayName: "John Doe",
      email: "user@example.com"
    });

    // Write user profile to Realtime Database
    var db = admin.database();
    var ref = db.ref("users/" + userRecord.uid);
    ref.set({
      profile: {
        displayName: "John Doe",
        email: "user@example.com"
      }
    });
  }).catch((error) => {
    console.log('Error creating new user:', error);
  });
  

Using the Firebase Admin SDK allows you to create powerful applications that integrate seamlessly with Firebase services, improving the user experience and simplifying back-end management.

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