npm install firebase-admin --save

const{initializeApp}=require('firebase-admin/app');

import{initializeApp}from'firebase-admin/app';

dependencies{implementation'com.google.firebase:firebase-admin:9.7.1'}

<dependency><groupId>com.google.firebase</groupId><artifactId>firebase-admin</artifactId><version>9.7.1</version></dependency>

sudo pip install firebase-admin

pip install --user firebase-admin

#Installthelatestversion:gogetfirebase.google.com/go/v4@latest#Orinstallaspecificversion:gogetfirebase.google.com/go/v4@4.19.0

Install-Package FirebaseAdmin -Version 3.4.0

dotnet add package FirebaseAdmin --version 3.4.0

<ItemGroup><PackageReferenceInclude="FirebaseAdmin"Version="3.4.0"/></ItemGroup>

FirebaseApp.Create();

constmyRefreshToken='...';// Get refresh token from OAuth2 flowinitializeApp({credential:refreshToken(myRefreshToken),databaseURL:'https://<DATABASE_NAME>.firebaseio.com'});

FileInputStreamrefreshToken=newFileInputStream("path/to/refreshToken.json");FirebaseOptionsoptions=FirebaseOptions.builder().setCredentials(GoogleCredentials.fromStream(refreshToken)).setDatabaseUrl("https://<DATABASE_NAME>.firebaseio.com/").build();FirebaseApp.initializeApp(options);

cred=credentials.RefreshToken('path/to/refreshToken.json')default_app=firebase_admin.initialize_app(cred)

opt:=option.WithCredentialsFile("path/to/refreshToken.json")config:=&firebase.Config{ProjectID:"my-project-id"}app,err:=firebase.NewApp(context.Background(),config,opt)iferr!=nil{log.Fatalf("error initializing app: %v\n",err)}
init.go

FirebaseApp.Create(newAppOptions(){Credential=GoogleCredential.FromFile("path/to/refreshToken.json"),});

exportGOOGLE_APPLICATION_CREDENTIALS="/home/user/Downloads/service-account-file.json"

$env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\username\Downloads\service-account-file.json"

initializeApp({credential:applicationDefault(),databaseURL:'https://<DATABASE_NAME>.firebaseio.com'});

FirebaseOptionsoptions=FirebaseOptions.builder().setCredentials(GoogleCredentials.getApplicationDefault()).setDatabaseUrl("https://<DATABASE_NAME>.firebaseio.com/").build();FirebaseApp.initializeApp(options);

default_app=firebase_admin.initialize_app()

app,err:=firebase.NewApp(context.Background(),nil)iferr!=nil{log.Fatalf("error initializing app: %v\n",err)}
init.go

FirebaseApp.Create(newAppOptions(){Credential=GoogleCredential.GetApplicationDefault(),ProjectId="my-project-id",});
FirebaseAppSnippets.cs

// Initialize the default appvardefaultApp=FirebaseApp.Create(newAppOptions(){Credential=GoogleCredential.GetApplicationDefault(),});Console.WriteLine(defaultApp.Name);// "[DEFAULT]"// Retrieve services by passing the defaultApp variable...vardefaultAuth=FirebaseAuth.GetAuth(defaultApp);// ... or use the equivalent shorthand notationdefaultAuth=FirebaseAuth.DefaultInstance;

// Initialize the default appinitializeApp(defaultAppConfig);// Initialize another app with a different configvarotherApp=initializeApp(otherAppConfig,'other');console.log(getApp().name);// '[DEFAULT]'console.log(otherApp.name);// 'other'// Use the shorthand notation to retrieve the default app's servicesconstdefaultAuth=getAuth();constdefaultDatabase=getDatabase();// Use the otherApp variable to retrieve the other app's servicesconstotherAuth=getAuth(otherApp);constotherDatabase=getDatabase(otherApp);

// Initialize the default appFirebaseAppdefaultApp=FirebaseApp.initializeApp(defaultOptions);// Initialize another app with a different configFirebaseAppotherApp=FirebaseApp.initializeApp(otherAppConfig,"other");System.out.println(defaultApp.getName());// "[DEFAULT]"System.out.println(otherApp.getName());// "other"// Use the shorthand notation to retrieve the default app's servicesFirebaseAuthdefaultAuth=FirebaseAuth.getInstance();FirebaseDatabasedefaultDatabase=FirebaseDatabase.getInstance();// Use the otherApp variable to retrieve the other app's servicesFirebaseAuthotherAuth=FirebaseAuth.getInstance(otherApp);FirebaseDatabaseotherDatabase=FirebaseDatabase.getInstance(otherApp);

# Initialize the default appdefault_app=firebase_admin.initialize_app(cred)#  Initialize another app with a different configother_app=firebase_admin.initialize_app(cred,name='other')print(default_app.name)# "[DEFAULT]"print(other_app.name)# "other"# Retrieve default services via the auth package...# auth.create_custom_token(...)# Use the `app` argument to retrieve the other app's services# auth.create_custom_token(..., app=other_app)

// Initialize the default appdefaultApp,err:=firebase.NewApp(context.Background(),nil)iferr!=nil{log.Fatalf("error initializing app: %v\n",err)}// Initialize another app with a different configopt:=option.WithCredentialsFile("service-account-other.json")otherApp,err:=firebase.NewApp(context.Background(),nil,opt)iferr!=nil{log.Fatalf("error initializing app: %v\n",err)}// Access Auth service from default appdefaultClient,err:=defaultApp.Auth(context.Background())iferr!=nil{log.Fatalf("error getting Auth client: %v\n",err)}// Access auth service from other appotherClient,err:=otherApp.Auth(context.Background())iferr!=nil{log.Fatalf("error getting Auth client: %v\n",err)}
init.go

// Initialize the default appvardefaultApp=FirebaseApp.Create(defaultOptions);// Initialize another app with a different configvarotherApp=FirebaseApp.Create(otherAppConfig,"other");Console.WriteLine(defaultApp.Name);// "[DEFAULT]"Console.WriteLine(otherApp.Name);// "other"// Use the shorthand notation to retrieve the default app's servicesvardefaultAuth=FirebaseAuth.DefaultInstance;// Use the otherApp variable to retrieve the other app's servicesvarotherAuth=FirebaseAuth.GetAuth(otherApp);

#Checktheexistingaccessscopesgcloudcomputeinstancesdescribe[INSTANCE_NAME]--format json#Theabovecommandreturnstheserviceaccountinformation.Forexample:"serviceAccounts":[   {    "email": "your.gserviceaccount.com",    "scopes": [     "https://www.googleapis.com/auth/cloud-platform",     "https://www.googleapis.com/auth/userinfo.email"]}],#StoptheVM,thenrunthefollowingcommand,usingtheserviceaccount#thatgcloudreturnedwhenyoucheckedthescopes.gcloudcomputeinstancesset-service-account[INSTANCE_NAME]--service-account "your.gserviceaccount.com" --scopes "https://www.googleapis.com/auth/firebase.database,https://www.googleapis.com/auth/userinfo.email"

gcloud auth application-default login --client-id-file=[/path/to/client/id/file]

import{initializeApp,applicationDefault}from'firebase-admin/app';initializeApp({credential:applicationDefault(),projectId:'<FIREBASE_PROJECT_ID>',});

FirebaseOptionsoptions=FirebaseOptions.builder().setCredentials(GoogleCredentials.getApplicationDefault()).setProjectId("<FIREBASE_PROJECT_ID>").build();FirebaseApp.initializeApp(options);

app_options={'projectId':'<FIREBASE_PROJECT_ID>'}default_app=firebase_admin.initialize_app(options=app_options)

config:=&firebase.Config{ProjectID:"<FIREBASE_PROJECT_ID>"}app,err:=firebase.NewApp(context.Background(),config)iferr!=nil{log.Fatalf("error initializing app: %v\n",err)}

FirebaseApp.Create(newAppOptions(){Credential=GoogleCredential.GetApplicationDefault(),ProjectId="<FIREBASE_PROJECT_ID>",});