Initialize Auth

The following methods provide various ways to initialize a FirebaseApp instance, offering more specific control over initialization parameters.

Method 1: Initialize with Environment Variables

Use the initializeAppWithEnvironmentVariables method to initialize a FirebaseApp using API key, project ID, and bucket name.

FirebaseApp firebaseApp = FirebaseApp.initializeAppWithEnvironmentVariables(
  apiKey,
  projectId,
  bucketName,
);

Parameters

• apiKey (String): Your Firebase API key.

• projectId (String): Your Firebase project ID.

• bucketName (String): The Cloud Storage bucket associated with the Firebase project.

Return

• FirebaseApp: Returns an initialized FirebaseApp instance.

Method 2: Initialize with Service Account

Use the initializeAppWithServiceAccount method to initialize a FirebaseApp using a service account for server-side Firebase operations.

FirebaseApp firebaseApp = FirebaseApp.initializeAppWithServiceAccount(
  serviceAccountContent,
  serviceAccountKeyFilePath,
);

Parameters

• serviceAccountContent (ServiceAccountContent): The content of the service account key.

• serviceAccountKeyFilePath (String): The file path to the service account key.

Return

• FirebaseApp: Returns an initialized FirebaseApp instance.

Method 3: Initialize with Service Account Impersonation

Use the initializeAppWithServiceAccountImpersonation method to initialize a FirebaseApp by impersonating a service account on behalf of a user.

FirebaseApp firebaseApp = FirebaseApp.initializeAppWithServiceAccountImpersonation(
  serviceAccountEmail,
  userEmail,
);

Return

• FirebaseApp: Returns an initialized FirebaseApp instance.

These methods provide flexible ways to initialize Firebase in your application, depending on your environment and authentication needs.