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Firebase Service Provider Set up

Authentication Service Providers enable you to use some implicit and authorization code grants. You could also use social providers on top of Federated / Identity providers to select other Social providers (e.g.: Twitter, Apple, GitHub, LinkedIn, WeChat etc.) that are not natively supported by us. Note: This will require you to register an app with the Authentication Service Providers.

This guide will help you to set up Firebase service prvoider:

Set up Firebase

If you haven't already, set up Firebase for your project. It is the mandatory step before we proceed further. After the basic setup, we'll learn how to create a custom verifier for the Web3Auth project. You can follow the link below to set up Firebase for your project. For React native, you can set up Firebase for Android and iOS separately. If we are missing any platform/framework, you can always check out Firebase documentation.

Set up a Custom verifier

Create a Firebase Verifier from the Custom Authentication tab of your Web3Auth Project.

  • Click on the Custom Authentication tab of your Web3Auth Project.

  • Click on the Create Verifier button.

  • Enter a name of your choice for the verifier identifier. eg. w3a-firebase-demo

  • Select Custom Providers from the Choose a Login Provider section. Verifier Modal on Web3Auth Dashboard

  • JWKS Endpoint: Enter as the JWKS endpoint for the Firebase.

  • Now you have the option to paste a sample idToken(JWT) to get the fields for the JWT validation. This step is optional, but if you have a sample JWT you can paste it here to get the fields for the JWT validation. You can also skip this step and fill in the fields manually.

  • The following are the JWT validation fields needed for the Firebase JWT validation:

    • Type iss as a field and as a value.
    • Next, type aud as a field and FIREBASE-PROJECT-ID as a value.

    Note: Replace the FIREBASE-PROJECT-ID with your Firebase Project ID.

  • Next, Select Sub, Email or a Custom value from the dropdown for the JWT Verifier ID. This is the field that will be used as the verifier ID for the user, and it has to be unique for each user.

  • Finally, Click on the Create button to create your verifier.

Verifier Modal on Web3Auth Dashboard

It may take up to 10 minutes to deploy the verifier on sapphire_devnet. You'll receive an email once it's complete.


After you have set up Firebase and the corresponding Custom verifier in the Web3Auth Dashboard, you can follow the guides to integrate it into your project. The support for using a custom verifier is not limited to the below SDKs and platforms. You can check out our SDK references to learn how to use a custom verifier.