Get started with Cloud Firestore

This quickstart shows you how to set up Cloud Firestore, add data, then view the data you just added in the Firebase console.

Create a Cloud Firestore project

  1. Open the Firebase Console and create a new project.

  2. In the Database section, click the Get Started button for Cloud Firestore.

  3. Select a starting mode for your Cloud Firestore Security Rules:

    Test mode

    Good for getting started with the mobile and web client libraries, but allows anyone to read and overwrite your data. After testing, make sure to see the Secure your data section.

    To get started with the Web, IOS, or Android SDK, select test mode.

    Locked mode

    Denies all reads and writes from mobile and web clients. Your authenticated application servers (C#, Go, Java, Node.js, PHP, Python, or Ruby) can still access your database.

    To get started with the C#, Go, Java, Node.js, PHP, Python, or Ruby server client library, select locked mode.

  4. Click Enable.

When you create a Cloud Firestore project, it also enables the API in the Cloud API Manager.

Set up your development environment

Add the required dependencies and client libraries to your app.

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/5.8.0/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/5.8.0/firebase-firestore.js"></script>
    The Cloud Firestore SDK is also available as an npm package. 
    npm install firebase@5.8.0 --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/Core'
pod 'Firebase/Firestore'
  3. Save the file and run pod install.
Android
  1. Follow the instructions to add Firebase to your Android app.
  2. Add the Cloud Firestore Android library to your app/build.gradle file: 
    implementation 'com.google.firebase:firebase-firestore:18.0.1'
Java
  1. Add the Firebase Admin SDK to your app:
    • Using Gradle: 
      compile 'com.google.firebase:firebase-admin:6.7.0'
    • Using Maven: 
      <dependency>
  <groupId>com.google.firebase</groupId>
  <artifactId>firebase-admin</artifactId>
  <version>6.7.0</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.
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="1.0.0-beta11" />
</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

Initialize Cloud Firestore

Initialize an instance of Cloud Firestore:

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();
To persist data when the device loses its connection, see the Enable Offline Data documentation.
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
Android
// Access a Cloud Firestore instance from your Activity
FirebaseFirestore db = FirebaseFirestore.getInstance();
DocSnippets.java
Kotlin
Android
// Access a Cloud Firestore instance from your Activity
val db = FirebaseFirestore.getInstance()
DocSnippets.kt
Java
The Cloud Firestore SDK is initialized in different ways depending on your environment. Below are the most common methods. For a complete reference, see Initialize the Admin SDK.
  • Initialize on Google Cloud Platform 
    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();
  • Initialize on your own server

    To use the Firebase Admin SDK on your own server, 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: 

    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
    The Cloud Firestore SDK is initialized in different ways depending on your environment. Below are the most common methods. For a complete reference, see Initialize the Admin SDK.
  • Initialize on Google Cloud Platform 
    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()
  • Initialize on your own server

    To use the Firebase Admin SDK on your own server, 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: 

    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()
    • Node.js
    The Cloud Firestore SDK is initialized in different ways depending on your environment. Below are the most common methods. For a complete reference, see Initialize the Admin SDK.
    • Initialize on Cloud Functions 
      const admin = require('firebase-admin');
const functions = require('firebase-functions');

admin.initializeApp(functions.config().firebase);

var db = admin.firestore();

      index.js
    • Initialize on Google Cloud Platform 
      const admin = require('firebase-admin');

admin.initializeApp({
  credential: admin.credential.applicationDefault()
});

var 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');

var serviceAccount = require('path/to/serviceAccountKey.json');

admin.initializeApp({
  credential: admin.credential.cert(serviceAccount)
});

var db = admin.firestore();

      index.js
    Go
    The Cloud Firestore SDK is initialized in different ways depending on your environment. Below are the most common methods. For a complete reference, see Initialize the Admin SDK.
  • Initialize on Google Cloud Platform 
    import (
  "log"

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

// Use the application default credentials
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()
  • Initialize on your own server

    To use the Firebase Admin SDK on your own server, 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: 

    import (
  "log"

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

// Use a service account
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
    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

    Add data

    Cloud Firestore stores data in Documents, which are stored in Collections. Cloud Firestore creates collections and documents implicitly the first time you add data to the document. You do not need to explicitly create collections or documents.

    Create a new collection and a document using the following example code.

    Web
    db.collection("users").add({
    first: "Ada",
    last: "Lovelace",
    born: 1815
})
.then(function(docRef) {
    console.log("Document written with ID: ", docRef.id);
})
.catch(function(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
    Android
    // 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
    Android
    // Create a new user with a first and last name
val user = HashMap<String, Any>()
user["first"] = "Ada"
user["last"] = "Lovelace"
user["born"] = 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
    Node.js
    var docRef = db.collection('users').doc('alovelace');

var setAda = 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
    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 "users/alovelace"

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

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

    Now add another document to the users collection. Notice that this document includes a key-value pair (middle name) that does not appear in the first document. Documents in a collection can contain different sets of information.

    Web
    // Add a second document with a generated ID.
db.collection("users").add({
    first: "Alan",
    middle: "Mathison",
    last: "Turing",
    born: 1912
})
.then(function(docRef) {
    console.log("Document written with ID: ", docRef.id);
})
.catch(function(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
    Android
    // 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
    Android
    // Create a new user with a first, middle, and last name
val user = HashMap<String, Any>()
user["first"] = "Alan"
user["middle"] = "Mathison"
user["last"] = "Turring"
user["born"] = 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
    Node.js
    var aTuringRef = db.collection('users').doc('aturing');

var setAlan = 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
    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 "users/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

    Read data

    To quickly verify that you've added data to Cloud Firestore, use the data viewer in the Firebase console.

    You can also use the "get" method to retrieve the entire collection.

    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
    Android
    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
    Android
    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.get()

for doc in docs:
    print(u'{} => {}'.format(doc.id, doc.to_dict()))
    snippets.py
    Node.js
    db.collection('users').get()
  .then((snapshot) => {
    snapshot.forEach((doc) => {
      console.log(doc.id, '=>', doc.data());
    });
  })
  .catch((err) => {
    console.log('Error getting documents', err);
  });
    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
    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 "users"
users_ref.get do |user|
  puts "#{user.document_id} data: #{user.data}."
end
    quickstart.rb

    Secure your data

    If you're using the Web, Android, or iOS SDK, use Firebase Authentication and Cloud Firestore Security Rules to secure your data in Cloud Firestore.

    Here are some basic rule sets you can use to get started. You can modify your security rules in the Rules tab of the console.

    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.uid != 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;
    }
  }
}

    If you're using one of the server SDKs, use Identity and Access Management (IAM) to secure your data in Cloud Firestore.

    Watch a video tutorial

    For detailed guidance on getting started with the Cloud Firestore mobile and web client libraries, watch one of the following video tutorials:

    Web
    iOS
    Android

    You can find more videos in the Firebase YouTube channel.

    Next steps

    Deepen your knowledge with the following topics:

    • Codelabs — Learn to use Cloud Firestore in a real app by following the codelab for Android, iOS, or Web.
    • Data model — Learn more about how data is structured in Cloud Firestore, including hierarchical data and subcollections.
    • Add data — Learn more about creating and updating data in Cloud Firestore.
    • Get data — Learn more about how to retrieve data.
    • Perform simple and compound queries — Learn how to run simple and compound queries.
    • Order and limit queries Learn how to order and limit the data returned by your queries.

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