Google Identity Toolkit API
Browse all Google APIs✓ Official Vendor SpecIdentity AuthAuthenticationoauth220 EndpointsREST
For Agents
Manage user accounts and federated sign-in for Firebase Authentication / legacy Identity Toolkit: create accounts, reset passwords, verify email, exchange credentials, and bulk import.
Use for: Create a new user with email and password, Send a password-reset email to a user, Verify a user's email address with an out-of-band code, Sign in a user with email and password and return an ID token
Not supported: Does not handle authorisation, IAM roles, or app-side session storage — use for Firebase Authentication / Identity Toolkit account creation, sign-in, and account migration only.
The Google Identity Toolkit API v3 is the relying-party endpoint set used by Firebase Authentication and the legacy Identity Toolkit product to manage user accounts and federated sign-in. It exposes operations for creating, retrieving, updating, and deleting accounts, sending email verification and password-reset codes, exchanging credentials for ID tokens, signing users up and in with email and password, and uploading or downloading bulk account data. Newer Firebase Auth deployments use the Identity Toolkit v2 surface; v3 remains the system of record for many existing apps and toolchains.
Install Jentic One Beta
Connect the Google Identity Toolkit API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the Google Identity Toolkit API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL https://raw.githubusercontent.com/jentic/jentic-one/main/tools/install.sh | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with Google Identity Toolkit API.
Create user accounts with email/password and assign initial profile fields
Issue email-verification, password-reset, and email-link sign-in confirmation codes
Sign users in via email and password and exchange for an ID token and refresh token
Look up account info by email or local ID and update profile or password
Bulk download and upload accounts to migrate users in or out of Firebase Authentication
Manage federated sign-in by creating sign-in URIs for IDPs and verifying the assertion
Use Cases
Patterns agents use Google Identity Toolkit API for, with concrete tasks.
★ Email-and-Password Sign-In for Web Apps
Web and mobile apps that use Firebase Authentication call the Identity Toolkit endpoints to sign users up and in with email and password, send verification emails, and reset forgotten passwords. /signupNewUser creates the account, /verifyPassword exchanges credentials for tokens, /getOobConfirmationCode generates the email link, and /resetPassword completes the reset flow. The API issues short-lived ID tokens that the app uses for authenticated API calls.
Call POST /signupNewUser with email user@example.com and password Tr0ub4d0r! and returnSecureToken true, and return the issued idToken and refreshToken.
Account Migration into Firebase
Teams migrating from a legacy auth system to Firebase Authentication use /uploadAccount to bulk-import accounts with their existing password hashes (scrypt, bcrypt, HMAC SHA variants), so users can sign in with their existing passwords on day one. /downloadAccount supports the reverse direction or backups. Both endpoints page through the user database in batches.
Bulk-import the supplied list of 100 users (email, hashed password, salt) via POST /uploadAccount with hashAlgorithm STANDARD_SCRYPT, and report how many were created versus skipped.
Email-Verification Workflow
Apps issue an email-verification link by calling /getOobConfirmationCode with VERIFY_EMAIL request type, then handle the user clicking the link by calling /setAccountInfo to flip emailVerified true. The API also supports the email-link sign-in flow via /emailLinkSignin for passwordless onboarding.
Send a verification email to user@example.com by calling /getOobConfirmationCode with requestType VERIFY_EMAIL and idToken set to the user's current token, and return the emailVerificationLink response.
AI Agent User Management Operations
An AI agent acting as a tier-2 support tool uses Jentic to look up users by email, force a password reset, or unlock an account on the Identity Toolkit API. Jentic isolates the Firebase admin credential so the agent never holds raw service-account JSON, and per-action policy limits which operations the agent can run.
Look up the user with email forgot@example.com via /getAccountInfo, then call /getOobConfirmationCode with requestType PASSWORD_RESET to send them a reset link, and return the oobLink.
Key Endpoints
20 endpoints — the google identity toolkit api v3 is the relying-party endpoint set used by firebase authentication and the legacy identity toolkit product to manage user accounts and federated sign-in.
METHOD
PATH
DESCRIPTION
POST
/signupNewUser
Create a new user account with email and password
POST
/verifyPassword
Sign in a user with email and password
POST
/getAccountInfo
Look up account info by email or localId
POST
/setAccountInfo
Update account fields including password and emailVerified
POST
/getOobConfirmationCode
Issue an out-of-band code for email verification, password reset, or email-link sign-in
POST
/resetPassword
Complete a password reset with an out-of-band code
POST
/deleteAccount
Delete a user account
POST
/downloadAccount
Bulk download accounts
POST
/signupNewUser
Create a new user account with email and password
POST
/verifyPassword
Sign in a user with email and password
POST
/getAccountInfo
Look up account info by email or localId
POST
/setAccountInfo
Update account fields including password and emailVerified
POST
/getOobConfirmationCode
Issue an out-of-band code for email verification, password reset, or email-link sign-in
POST
/resetPassword
Complete a password reset with an out-of-band code
POST
/deleteAccount
Delete a user account
POST
/downloadAccount
Bulk download accounts
Why Jentic?
Three things that make agents converge on Jentic-routed access.
Credential isolation
Firebase Authentication admin credentials are stored encrypted in the Jentic vault. Each Identity Toolkit call mints a short-lived OAuth access token at execution so raw service-account JSON never enters the agent runtime.
Intent-based discovery
Agents search 'send password reset email firebase' or 'sign up firebase user' and Jentic returns the matching v3 operation with its parameter schema, hiding the unusual /relyingparty path style.
Time to first call
Direct integration: 1-3 days to implement OAuth, signup, sign-in, email link, and bulk import flows. Through Jentic: under 2 hours to call the same operations from an agent.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using Google Identity Toolkit API through Jentic.
What authentication does the Identity Toolkit API use?
Google OAuth 2.0 with the cloud-platform / firebase scopes for admin endpoints, and the user's own ID token for self-service endpoints. Bulk import/export and account lookups require a service-account credential. Through Jentic the credentials live encrypted in the vault.
Can I bulk-import users with existing password hashes?
Yes. POST /uploadAccount accepts batches of users with hashAlgorithm set to STANDARD_SCRYPT, BCRYPT, HMAC_SHA1, HMAC_SHA256, or other supported variants, plus signerKey and saltSeparator where required. Users can sign in with their original passwords after import.
What are the rate limits for the Identity Toolkit API?
Google enforces per-project quotas on Firebase Authentication operations (default thousands of QPS for sign-in, lower for /uploadAccount and /downloadAccount). Email-sending endpoints (/getOobConfirmationCode) have separate sender quotas to prevent abuse.
How do I send a password-reset email through Jentic?
Search Jentic with 'send password reset email firebase', load the POST /getOobConfirmationCode operation, and execute with email set to the user's address and requestType PASSWORD_RESET. Jentic returns the oobLink and Firebase sends the email on the project's behalf.
Should I use Identity Toolkit v3 or the newer Firebase Auth v2 surface?
v3 (this API) is the long-standing relying-party surface still used by many SDKs; the newer Identity Toolkit v2 surface (identitytoolkit.googleapis.com/v2/) covers tenant-aware Firebase Auth with Identity Platform features (MFA, SAML/OIDC). Pick v3 for legacy and v2 for new tenant-aware deployments.
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