Get started with Cloud Firestore

Web

1. Follow the instructions to add Firebase to your Web app.
2. Add the Firebase and Cloud Firestore libraries to your app:

   <script src="https://www.gstatic.com/firebasejs/8.2.9/firebase-app.js"></script>
   <script src="https://www.gstatic.com/firebasejs/8.2.9/firebase-firestore.js"></script>

   The Cloud Firestore SDK is also available as an npm package.

   npm install firebase@8.2.9 --save
   

   You'll need to manually require both Firebase and Cloud Firestore.

   const firebase = require("firebase");
   // Required for side-effects
   require("firebase/firestore");
   

iOS

1. Follow the instructions to add Firebase to your iOS app.
2. Add the Cloud Firestore pod to your Podfile

   pod 'Firebase/Firestore'
   
   # Optionally, include the Swift extensions if you're using Swift.
   pod 'FirebaseFirestoreSwift'
   

3. Save the file and run pod install.

Java

1. Follow the instructions to add Firebase to your Android app.
2. Using the Firebase Android BoM, declare the dependency for the Cloud Firestore Android library in your module (app-level) Gradle file (usually app/build.gradle).

   dependencies {
       // Import the BoM for the Firebase platform
       implementation platform('com.google.firebase:firebase-bom:26.5.0')
   
       // Declare the dependency for the Cloud Firestore library
       // When using the BoM, you don't specify versions in Firebase library dependencies
       implementation 'com.google.firebase:firebase-firestore'
   }
   

   By using the Firebase Android BoM, your app will always use compatible versions of the Firebase Android libraries.

   (Alternative) Declare Firebase library dependencies without using the BoM

   If you choose not to use the Firebase BoM, you must specify each Firebase library version in its dependency line.

   Note that if you use multiple Firebase libraries in your app, we highly recommend using the BoM to manage library versions, which ensures that all versions are compatible.

   dependencies {
       // Declare the dependency for the Cloud Firestore library
       // When NOT using the BoM, you must specify versions in Firebase library dependencies
       implementation 'com.google.firebase:firebase-firestore:22.1.0'
   }
   

Kotlin+KTX

1. Follow the instructions to add Firebase to your Android app.
2. Using the Firebase Android BoM, declare the dependency for the Cloud Firestore Android library in your module (app-level) Gradle file (usually app/build.gradle).

   dependencies {
       // Import the BoM for the Firebase platform
       implementation platform('com.google.firebase:firebase-bom:26.5.0')
   
       // Declare the dependency for the Cloud Firestore library
       // When using the BoM, you don't specify versions in Firebase library dependencies
       implementation 'com.google.firebase:firebase-firestore-ktx'
   }
   

   By using the Firebase Android BoM, your app will always use compatible versions of the Firebase Android libraries.

   (Alternative) Declare Firebase library dependencies without using the BoM

   If you choose not to use the Firebase BoM, you must specify each Firebase library version in its dependency line.

   Note that if you use multiple Firebase libraries in your app, we highly recommend using the BoM to manage library versions, which ensures that all versions are compatible.

   dependencies {
       // Declare the dependency for the Cloud Firestore library
       // When NOT using the BoM, you must specify versions in Firebase library dependencies
       implementation 'com.google.firebase:firebase-firestore-ktx:22.1.0'
   }
   

Java

1. Add the Firebase Admin SDK to your app:
   • Using Gradle:

     compile 'com.google.firebase:firebase-admin:7.1.0'
     

   • Using Maven:

     <dependency>
       <groupId>com.google.firebase</groupId>
       <artifactId>firebase-admin</artifactId>
       <version>7.1.0</version>
     </dependency>
          

2. Follow the instructions below to initialize Cloud Firestore with the proper credentials in your environment.

Python

1. Add the Firebase Admin SDK to your Python app:

   pip install --upgrade firebase-admin

2. Follow the instructions below to initialize Cloud Firestore with the proper credentials in your environment.

C++

1. Follow the instructions to add Firebase to your C++ project.
2. C++ interface for Android.
• Gradle dependencies. Add the following to your module (app-level) Gradle file (usually app/build.gradle):

          android.defaultConfig.externalNativeBuild.cmake {
            arguments "-DFIREBASE_CPP_SDK_DIR=$gradle.firebase_cpp_sdk_dir"
          }
  
          apply from: "$gradle.firebase_cpp_sdk_dir/Android/firebase_dependencies.gradle"
          firebaseCpp.dependencies {
            // earlier entries
            auth
            firestore
          }
          

• Binary dependencies. Similarly, the recommended way to get the binary dependencies is to add the following to your CMakeLists.txt file:

          add_subdirectory(${FIREBASE_CPP_SDK_DIR} bin/ EXCLUDE_FROM_ALL)
          set(firebase_libs firebase_auth firebase_firestore firebase_app)
          # Replace the target name below with the actual name of your target,
          # for example, "native-lib".
          target_link_libraries(${YOUR_TARGET_NAME_HERE} "${firebase_libs}")
          

3. To set up desktop integration, see Add Firebase to your C++ project.

Unity

1. Follow the instructions to add Firebase to your Unity project.
2. Unity interface for Android.

When building for Android, enable ProGuarding to avoid the Android DEX limit. To do so, in the Unity editor:

1. Select File > Build Settings
2. Switch ‘Platform’ to ‘Android’ and click ‘Switch Platform’
3. Click ‘Player Settings…’
4. In main Unity UI, under ‘Settings for Android’, select ‘Publishing Settings’
5. Under ‘Minify’ section, change both Release and Debug settings from ‘None’ to ‘ProGuard’

Node.js

1. Add the Firebase Admin SDK to your app:

   npm install firebase-admin --save

2. Follow the instructions below to initialize Cloud Firestore with the proper credentials in your environment.

Go

1. Add the Firebase Admin SDK to your Go app:

   go get firebase.google.com/go
   

2. Follow the instructions below to initialize Cloud Firestore with the proper credentials in your environment.

PHP

1. The Cloud Firestore server client libraries (Java, Node.js, Python, Go, PHP, C#, and Ruby) use Google Application Default Credentials for authentication.
   • To authenticate from your development environment, set the GOOGLE_APPLICATION_CREDENTIALS environment variable to point to a JSON service account key file. You can create a key file on the API Console Credentials page.

     export GOOGLE_APPLICATION_CREDENTIALS="path/to/your/keyfile.json"

   • In your production environment, you do not need to authenticate if you run your application on App Engine or Compute Engine, using the same project that you use for Cloud Firestore. Otherwise, set up a service account.
2. Install and enable the gRPC extension for PHP, which you will need to use the client library.
3. Add the Cloud Firestore PHP library to your app:

   composer require google/cloud-firestore

C#

1. The Cloud Firestore server client libraries (Java, Node.js, Python, Go, PHP, C#, and Ruby) use Google Application Default Credentials for authentication.
   • To authenticate from your development environment, set the GOOGLE_APPLICATION_CREDENTIALS environment variable to point to a JSON service account key file. You can create a key file on the API Console Credentials page.

     export GOOGLE_APPLICATION_CREDENTIALS="path/to/your/keyfile.json"

   • In your production environment, you do not need to authenticate if you run your application on App Engine or Compute Engine, using the same project that you use for Cloud Firestore. Otherwise, set up a service account.
2. Add the Cloud Firestore C# library to your app in your .csproj file:

   <ItemGroup>
     <PackageReference Include="Google.Cloud.Firestore" Version="1.1.0-beta01" />
   </ItemGroup>

3. Add the following to your Program.cs file:

   using Google.Cloud.Firestore;

Ruby

1. The Cloud Firestore server client libraries (Java, Node.js, Python, Go, PHP, C#, and Ruby) use Google Application Default Credentials for authentication.
   • To authenticate from your development environment, set the GOOGLE_APPLICATION_CREDENTIALS environment variable to point to a JSON service account key file. You can create a key file on the API Console Credentials page.

     export GOOGLE_APPLICATION_CREDENTIALS="path/to/your/keyfile.json"

   • In your production environment, you do not need to authenticate if you run your application on App Engine or Compute Engine, using the same project that you use for Cloud Firestore. Otherwise, set up a service account.
2. Add the Cloud Firestore Ruby library to your app in your Gemfile:

   gem "google-cloud-firestore"

3. Install dependencies from your Gemfile using:

   bundle install

Web

// Initialize Cloud Firestore through Firebase
firebase.initializeApp({
  apiKey: '### FIREBASE API KEY ###',
  authDomain: '### FIREBASE AUTH DOMAIN ###',
  projectId: '### CLOUD FIRESTORE PROJECT ID ###'
});

var db = firebase.firestore();

Swift

import Firebase

FirebaseApp.configure()

let db = Firestore.firestore()
AppDelegate.swift

Objective-C

@import Firebase;

// Use Firebase library to configure APIs
[FIRApp configure];

FIRFirestore *defaultFirestore = [FIRFirestore firestore];
AppDelegate.m
  

Java

// Access a Cloud Firestore instance from your Activity
FirebaseFirestore db = FirebaseFirestore.getInstance();
DocSnippets.java

Kotlin+KTX

// Access a Cloud Firestore instance from your Activity
val db = Firebase.firestore
DocSnippets.kt

Java

import com.google.auth.oauth2.GoogleCredentials;
import com.google.cloud.firestore.Firestore;

import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;

// Use the application default credentials
GoogleCredentials credentials = GoogleCredentials.getApplicationDefault();
FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredentials(credentials)
    .setProjectId(projectId)
    .build();
FirebaseApp.initializeApp(options);

Firestore db = FirestoreClient.getFirestore();

import com.google.auth.oauth2.GoogleCredentials;
import com.google.cloud.firestore.Firestore;

import com.google.firebase.FirebaseApp;
import com.google.firebase.FirebaseOptions;

// Use a service account
InputStream serviceAccount = new FileInputStream("path/to/serviceAccount.json");
GoogleCredentials credentials = GoogleCredentials.fromStream(serviceAccount);
FirebaseOptions options = new FirebaseOptions.Builder()
    .setCredentials(credentials)
    .build();
FirebaseApp.initializeApp(options);

Firestore db = FirestoreClient.getFirestore();

Python

import firebase_admin
from firebase_admin import credentials
from firebase_admin import firestore

# Use the application default credentials
cred = credentials.ApplicationDefault()
firebase_admin.initialize_app(cred, {
  'projectId': project_id,
})

db = firestore.client()

import firebase_admin
from firebase_admin import credentials
from firebase_admin import firestore

# Use a service account
cred = credentials.Certificate('path/to/serviceAccount.json')
firebase_admin.initialize_app(cred)

db = firestore.client()

C++

// Make sure the call to `Create()` happens some time before you call Firestore::GetInstance().
App::Create();
Firestore* db = Firestore::GetInstance();
AppDelegate.mm

Node.js

• Initialize on Cloud Functions

  const admin = require('firebase-admin');
  admin.initializeApp();
  
  const db = admin.firestore();
  index.js
  

• Initialize on Google Cloud Platform

  const admin = require('firebase-admin');
  
  admin.initializeApp({
    credential: admin.credential.applicationDefault()
  });
  
  const db = admin.firestore();
  index.js
  

• Initialize on your own server

  To use the Firebase Admin SDK on your own server (or any other Node.js environment), use a service account. Go to IAM & admin > Service accounts in the Cloud Platform Console. Generate a new private key and save the JSON file. Then use the file to initialize the SDK:

  const admin = require('firebase-admin');
  
  const serviceAccount = require('./path/to/serviceAccountKey.json');
  
  admin.initializeApp({
    credential: admin.credential.cert(serviceAccount)
  });
  
  const db = admin.firestore();
  index.js
  

Go

import (
  "log"

  firebase "firebase.google.com/go"
  "google.golang.org/api/option"
)

// Use the application default credentials
ctx := context.Background()
conf := &firebase.Config{ProjectID: projectID}
app, err := firebase.NewApp(ctx, conf)
if err != nil {
  log.Fatalln(err)
}

client, err := app.Firestore(ctx)
if err != nil {
  log.Fatalln(err)
}
defer client.Close()

import (
  "log"

  firebase "firebase.google.com/go"
  "google.golang.org/api/option"
)

// Use a service account
ctx := context.Background()
sa := option.WithCredentialsFile("path/to/serviceAccount.json")
app, err := firebase.NewApp(ctx, nil, sa)
if err != nil {
  log.Fatalln(err)
}

client, err := app.Firestore(ctx)
if err != nil {
  log.Fatalln(err)
}
defer client.Close()

PHP

use Google\Cloud\Firestore\FirestoreClient;

/**
 * Initialize Cloud Firestore with default project ID.
 * ```
 * initialize();
 * ```
 */
function initialize()
{
    // Create the Cloud Firestore client
    $db = new FirestoreClient();
    printf('Created Cloud Firestore client with default project ID.' . PHP_EOL);
}
initialize.php

Unity

using Firebase.Firestore;
using Firebase.Extensions;
FirebaseFirestore db = FirebaseFirestore.DefaultInstance;

C#

FirestoreDb db = FirestoreDb.Create(project);
Console.WriteLine("Created Cloud Firestore client with project ID: {0}", project);
Program.cs

Ruby

require "google/cloud/firestore"

firestore = Google::Cloud::Firestore.new project_id: project_id

puts "Created Cloud Firestore client with given project ID."
quickstart.rb

Web

db.collection("users").add({
    first: "Ada",
    last: "Lovelace",
    born: 1815
})
.then((docRef) => {
    console.log("Document written with ID: ", docRef.id);
})
.catch((error) => {
    console.error("Error adding document: ", error);
});
test.firestore.js

Swift

// Add a new document with a generated ID
var ref: DocumentReference? = nil
ref = db.collection("users").addDocument(data: [
    "first": "Ada",
    "last": "Lovelace",
    "born": 1815
]) { err in
    if let err = err {
        print("Error adding document: \(err)")
    } else {
        print("Document added with ID: \(ref!.documentID)")
    }
}
ViewController.swift

Objective-C

// Add a new document with a generated ID
__block FIRDocumentReference *ref =
    [[self.db collectionWithPath:@"users"] addDocumentWithData:@{
      @"first": @"Ada",
      @"last": @"Lovelace",
      @"born": @1815
    } completion:^(NSError * _Nullable error) {
      if (error != nil) {
        NSLog(@"Error adding document: %@", error);
      } else {
        NSLog(@"Document added with ID: %@", ref.documentID);
      }
    }];
ViewController.m
  

Java

// Create a new user with a first and last name
Map<String, Object> user = new HashMap<>();
user.put("first", "Ada");
user.put("last", "Lovelace");
user.put("born", 1815);

// Add a new document with a generated ID
db.collection("users")
        .add(user)
        .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
            @Override
            public void onSuccess(DocumentReference documentReference) {
                Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.getId());
            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.w(TAG, "Error adding document", e);
            }
        });
DocSnippets.java

Kotlin+KTX

// Create a new user with a first and last name
val user = hashMapOf(
        "first" to "Ada",
        "last" to "Lovelace",
        "born" to 1815
)

// Add a new document with a generated ID
db.collection("users")
    .add(user)
    .addOnSuccessListener { documentReference ->
        Log.d(TAG, "DocumentSnapshot added with ID: ${documentReference.id}")
    }
    .addOnFailureListener { e ->
        Log.w(TAG, "Error adding document", e)
    }
DocSnippets.kt

Java

DocumentReference docRef = db.collection("users").document("alovelace");
// Add document data  with id "alovelace" using a hashmap
Map<String, Object> data = new HashMap<>();
data.put("first", "Ada");
data.put("last", "Lovelace");
data.put("born", 1815);
//asynchronously write data
ApiFuture<WriteResult> result = docRef.set(data);
// ...
// result.get() blocks on response
System.out.println("Update time : " + result.get().getUpdateTime());
Quickstart.java
  

Python

doc_ref = db.collection(u'users').document(u'alovelace')
doc_ref.set({
    u'first': u'Ada',
    u'last': u'Lovelace',
    u'born': 1815
})
snippets.py
  

C++

// Add a new document with a generated ID
Future<DocumentReference> user_ref =
    db->Collection("users").Add({{"first", FieldValue::String("Ada")},
                                 {"last", FieldValue::String("Lovelace")},
                                 {"born", FieldValue::Integer(1815)}});

user_ref.OnCompletion([](const Future<DocumentReference>& future) {
  if (future.error() == Error::kErrorOk) {
    std::cout << "DocumentSnapshot added with ID: " << future.result()->id()
              << '\n';
  } else {
    std::cout << "Error adding document: " << future.error_message() << '\n';
  }
});
snippets.cpp
  

Node.js

const docRef = db.collection('users').doc('alovelace');

await docRef.set({
  first: 'Ada',
  last: 'Lovelace',
  born: 1815
});
index.js
  

Go

_, _, err := client.Collection("users").Add(ctx, map[string]interface{}{
	"first": "Ada",
	"last":  "Lovelace",
	"born":  1815,
})
if err != nil {
	log.Fatalf("Failed adding alovelace: %v", err)
}
main.go
  

PHP

$docRef = $db->collection('users')->document('lovelace');
$docRef->set([
    'first' => 'Ada',
    'last' => 'Lovelace',
    'born' => 1815
]);
printf('Added data to the lovelace document in the users collection.' . PHP_EOL);
add_data.php
  

Unity

DocumentReference docRef = db.Collection("users").Document("alovelace");
Dictionary<string, object> user = new Dictionary<string, object>
{
	{ "First", "Ada" },
	{ "Last", "Lovelace" },
	{ "Born", 1815 },
};
docRef.SetAsync(user).ContinueWithOnMainThread(task => {
	Debug.Log("Added data to the alovelace document in the users collection.");
});
  

C#

DocumentReference docRef = db.Collection("users").Document("alovelace");
Dictionary<string, object> user = new Dictionary<string, object>
{
    { "First", "Ada" },
    { "Last", "Lovelace" },
    { "Born", 1815 }
};
await docRef.SetAsync(user);
Program.cs
  

Ruby

doc_ref = firestore.doc "#{collection_path}/alovelace"

doc_ref.set(
  first: "Ada",
  last:  "Lovelace",
  born:  1815
)

puts "Added data to the alovelace document in the users collection."
quickstart.rb
  

Web

// Add a second document with a generated ID.
db.collection("users").add({
    first: "Alan",
    middle: "Mathison",
    last: "Turing",
    born: 1912
})
.then((docRef) => {
    console.log("Document written with ID: ", docRef.id);
})
.catch((error) => {
    console.error("Error adding document: ", error);
});
test.firestore.js

Swift

// Add a second document with a generated ID.
ref = db.collection("users").addDocument(data: [
    "first": "Alan",
    "middle": "Mathison",
    "last": "Turing",
    "born": 1912
]) { err in
    if let err = err {
        print("Error adding document: \(err)")
    } else {
        print("Document added with ID: \(ref!.documentID)")
    }
}
ViewController.swift

Objective-C

// Add a second document with a generated ID.
__block FIRDocumentReference *ref =
    [[self.db collectionWithPath:@"users"] addDocumentWithData:@{
      @"first": @"Alan",
      @"middle": @"Mathison",
      @"last": @"Turing",
      @"born": @1912
    } completion:^(NSError * _Nullable error) {
      if (error != nil) {
        NSLog(@"Error adding document: %@", error);
      } else {
        NSLog(@"Document added with ID: %@", ref.documentID);
      }
    }];
ViewController.m
  

Java

// Create a new user with a first, middle, and last name
Map<String, Object> user = new HashMap<>();
user.put("first", "Alan");
user.put("middle", "Mathison");
user.put("last", "Turing");
user.put("born", 1912);

// Add a new document with a generated ID
db.collection("users")
        .add(user)
        .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
            @Override
            public void onSuccess(DocumentReference documentReference) {
                Log.d(TAG, "DocumentSnapshot added with ID: " + documentReference.getId());
            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.w(TAG, "Error adding document", e);
            }
        });
DocSnippets.java

Kotlin+KTX

// Create a new user with a first, middle, and last name
val user = hashMapOf(
        "first" to "Alan",
        "middle" to "Mathison",
        "last" to "Turing",
        "born" to 1912
)

// Add a new document with a generated ID
db.collection("users")
    .add(user)
    .addOnSuccessListener { documentReference ->
        Log.d(TAG, "DocumentSnapshot added with ID: ${documentReference.id}")
    }
    .addOnFailureListener { e ->
        Log.w(TAG, "Error adding document", e)
    }
DocSnippets.kt

Java

DocumentReference docRef = db.collection("users").document("aturing");
// Add document data with an additional field ("middle")
Map<String, Object> data = new HashMap<>();
data.put("first", "Alan");
data.put("middle", "Mathison");
data.put("last", "Turing");
data.put("born", 1912);

ApiFuture<WriteResult> result = docRef.set(data);
System.out.println("Update time : " + result.get().getUpdateTime());
Quickstart.java
  

Python

doc_ref = db.collection(u'users').document(u'aturing')
doc_ref.set({
    u'first': u'Alan',
    u'middle': u'Mathison',
    u'last': u'Turing',
    u'born': 1912
})
snippets.py
  

C++

db->Collection("users")
    .Add({{"first", FieldValue::String("Alan")},
          {"middle", FieldValue::String("Mathison")},
          {"last", FieldValue::String("Turing")},
          {"born", FieldValue::Integer(1912)}})
    .OnCompletion([](const Future<DocumentReference>& future) {
      if (future.error() == Error::kErrorOk) {
        std::cout << "DocumentSnapshot added with ID: "
                  << future.result()->id() << '\n';
      } else {
        std::cout << "Error adding document: " << future.error_message()
                  << '\n';
      }
    });
snippets.cpp
  

Node.js

const aTuringRef = db.collection('users').doc('aturing');

await aTuringRef.set({
  'first': 'Alan',
  'middle': 'Mathison',
  'last': 'Turing',
  'born': 1912
});
index.js
  

Go

_, _, err = client.Collection("users").Add(ctx, map[string]interface{}{
	"first":  "Alan",
	"middle": "Mathison",
	"last":   "Turing",
	"born":   1912,
})
if err != nil {
	log.Fatalf("Failed adding aturing: %v", err)
}
main.go
  

PHP

$docRef = $db->collection('users')->document('aturing');
$docRef->set([
    'first' => 'Alan',
    'middle' => 'Mathison',
    'last' => 'Turing',
    'born' => 1912
]);
printf('Added data to the aturing document in the users collection.' . PHP_EOL);
add_data.php
  

Unity

DocumentReference docRef = db.Collection("users").Document("aturing");
Dictionary<string, object> user = new Dictionary<string, object>
{
	{ "First", "Alan" },
	{ "Middle", "Mathison" },
	{ "Last", "Turing" },
	{ "Born", 1912 }
};
docRef.SetAsync(user).ContinueWithOnMainThread(task => {
	Debug.Log("Added data to the aturing document in the users collection.");
});
  

C#

DocumentReference docRef = db.Collection("users").Document("aturing");
Dictionary<string, object> user = new Dictionary<string, object>
{
    { "First", "Alan" },
    { "Middle", "Mathison" },
    { "Last", "Turing" },
    { "Born", 1912 }
};
await docRef.SetAsync(user);
Program.cs
  

Ruby

doc_ref = firestore.doc "#{collection_path}/aturing"

doc_ref.set(
  first:  "Alan",
  middle: "Mathison",
  last:   "Turing",
  born:   1912
)

puts "Added data to the aturing document in the users collection."
quickstart.rb
  

Web

db.collection("users").get().then((querySnapshot) => {
    querySnapshot.forEach((doc) => {
        console.log(`${doc.id} => ${doc.data()}`);
    });
});
test.firestore.js

Swift

db.collection("users").getDocuments() { (querySnapshot, err) in
    if let err = err {
        print("Error getting documents: \(err)")
    } else {
        for document in querySnapshot!.documents {
            print("\(document.documentID) => \(document.data())")
        }
    }
}
ViewController.swift

Objective-C

[[self.db collectionWithPath:@"users"]
    getDocumentsWithCompletion:^(FIRQuerySnapshot * _Nullable snapshot,
                                 NSError * _Nullable error) {
      if (error != nil) {
        NSLog(@"Error getting documents: %@", error);
      } else {
        for (FIRDocumentSnapshot *document in snapshot.documents) {
          NSLog(@"%@ => %@", document.documentID, document.data);
        }
      }
    }];
ViewController.m
  

Java

db.collection("users")
        .get()
        .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
            @Override
            public void onComplete(@NonNull Task<QuerySnapshot> task) {
                if (task.isSuccessful()) {
                    for (QueryDocumentSnapshot document : task.getResult()) {
                        Log.d(TAG, document.getId() + " => " + document.getData());
                    }
                } else {
                    Log.w(TAG, "Error getting documents.", task.getException());
                }
            }
        });
DocSnippets.java

Kotlin+KTX

db.collection("users")
        .get()
        .addOnSuccessListener { result ->
            for (document in result) {
                Log.d(TAG, "${document.id} => ${document.data}")
            }
        }
        .addOnFailureListener { exception ->
            Log.w(TAG, "Error getting documents.", exception)
        }
DocSnippets.kt

Java

// asynchronously retrieve all users
ApiFuture<QuerySnapshot> query = db.collection("users").get();
// ...
// query.get() blocks on response
QuerySnapshot querySnapshot = query.get();
List<QueryDocumentSnapshot> documents = querySnapshot.getDocuments();
for (QueryDocumentSnapshot document : documents) {
  System.out.println("User: " + document.getId());
  System.out.println("First: " + document.getString("first"));
  if (document.contains("middle")) {
    System.out.println("Middle: " + document.getString("middle"));
  }
  System.out.println("Last: " + document.getString("last"));
  System.out.println("Born: " + document.getLong("born"));
}
Quickstart.java
  

Python

users_ref = db.collection(u'users')
docs = users_ref.stream()

for doc in docs:
    print(f'{doc.id} => {doc.to_dict()}')
snippets.py
  

C++

Future<QuerySnapshot> users = db->Collection("users").Get();
users.OnCompletion([](const Future<QuerySnapshot>& future) {
  if (future.error() == Error::kErrorOk) {
    for (const DocumentSnapshot& document : future.result()->documents()) {
      std::cout << document << '\n';
    }
  } else {
    std::cout << "Error getting documents: " << future.error_message()
              << '\n';
  }
});
snippets.cpp
  

Node.js

const snapshot = await db.collection('users').get();
snapshot.forEach((doc) => {
  console.log(doc.id, '=>', doc.data());
});
index.js
  

Go

iter := client.Collection("users").Documents(ctx)
for {
	doc, err := iter.Next()
	if err == iterator.Done {
		break
	}
	if err != nil {
		log.Fatalf("Failed to iterate: %v", err)
	}
	fmt.Println(doc.Data())
}
main.go
  

PHP

$usersRef = $db->collection('users');
$snapshot = $usersRef->documents();
foreach ($snapshot as $user) {
    printf('User: %s' . PHP_EOL, $user->id());
    printf('First: %s' . PHP_EOL, $user['first']);
    if (!empty($user['middle'])) {
        printf('Middle: %s' . PHP_EOL, $user['middle']);
    }
    printf('Last: %s' . PHP_EOL, $user['last']);
    printf('Born: %d' . PHP_EOL, $user['born']);
    printf(PHP_EOL);
}
printf('Retrieved and printed out all documents from the users collection.' . PHP_EOL);
get_all.php
  

Unity

CollectionReference usersRef = db.Collection("users");
usersRef.GetSnapshotAsync().ContinueWithOnMainThread(task =>
{
  QuerySnapshot snapshot = task.Result;
  foreach (DocumentSnapshot document in snapshot.Documents)
  {
    Debug.Log(String.Format("User: {0}", document.Id));
    Dictionary<string, object> documentDictionary = document.ToDictionary();
    Debug.Log(String.Format("First: {0}", documentDictionary["First"]));
    if (documentDictionary.ContainsKey("Middle"))
    {
      Debug.Log(String.Format("Middle: {0}", documentDictionary["Middle"]));
    }

    Debug.Log(String.Format("Last: {0}", documentDictionary["Last"]));
    Debug.Log(String.Format("Born: {0}", documentDictionary["Born"]));
  }

  Debug.Log("Read all data from the users collection.");
});
  

C#

CollectionReference usersRef = db.Collection("users");
QuerySnapshot snapshot = await usersRef.GetSnapshotAsync();
foreach (DocumentSnapshot document in snapshot.Documents)
{
    Console.WriteLine("User: {0}", document.Id);
    Dictionary<string, object> documentDictionary = document.ToDictionary();
    Console.WriteLine("First: {0}", documentDictionary["First"]);
    if (documentDictionary.ContainsKey("Middle"))
    {
        Console.WriteLine("Middle: {0}", documentDictionary["Middle"]);
    }
    Console.WriteLine("Last: {0}", documentDictionary["Last"]);
    Console.WriteLine("Born: {0}", documentDictionary["Born"]);
    Console.WriteLine();
}
Program.cs
  

Ruby

users_ref = firestore.col collection_path
users_ref.get do |user|
  puts "#{user.document_id} data: #{user.data}."
end
quickstart.rb
  

Auth required

// Allow read/write access on all documents to any user signed in to the application
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if request.auth != null;
    }
  }
}

Locked mode

// Deny read/write access to all users under any conditions
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if false;
    }
  }
}

Test mode

// Allow read/write access to all users under any conditions
// Warning: **NEVER** use this rule set in production; it allows
// anyone to overwrite your entire database.
service cloud.firestore {
  match /databases/{database}/documents {
    match /{document=**} {
      allow read, write: if true;
    }
  }
}

Web v8

iOS

Android