Signing in users with a custom authentication system
This document shows you how to use Identity Platform to sign in users with a custom authentication system. In custom authentication, you use an authentication server to produce custom signed tokens when a user successfully signs in. Your app receives this token and uses it to authenticate with Identity Platform.
Before you begin
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Configure your server to accept user credentials and mint custom tokens .
Signing in users
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Collect sign-in credentials from the user.
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Send the credentials to your server. Your server validates the request, and returns a custom JWT.
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Pass the JWT to
signInWithCustomToken()to authenticate the user with Identity Platform:Web version 9
import { getAuth , signInWithCustomToken } from "firebase/auth" ; const auth = getAuth (); signInWithCustomToken ( auth , token ) . then (( userCredential ) = > { // Signed in const user = userCredential . user ; // ... }) . catch (( error ) = > { const errorCode = error . code ; const errorMessage = error . message ; // ... });
Web version 8
firebase . auth (). signInWithCustomToken ( token ) . then (( userCredential ) = > { // Signed in var user = userCredential . user ; // ... }) . catch (( error ) = > { var errorCode = error . code ; var errorMessage = error . message ; // ... });
What's next
- Configure custom claims on users.
- Use the REST API to integrate Identity Platform with other parts of your custom authentication system.
