File: fusionauth.md | Updated: 11/15/2025
š NextAuth.js is now part of Better Auth !
This is documentation for NextAuth.js v3, which is no longer actively maintained.
For up-to-date documentation, see the **latest version ** (v4).
Version: v3
On this page
Documentationā
https://fusionauth.io/docs/v1/tech/oauth/
Optionsā
The FusionAuth Provider comes with a set of default options:
You can override any of the options to suit your own use case.
Exampleā
import Providers from `next-auth/providers`...providers: [ Providers.FusionAuth({ id: "fusionauth", name: "FusionAuth", domain: process.env.FUSIONAUTH_DOMAIN, clientId: process.env.FUSIONAUTH_CLIENT_ID, clientSecret: process.env.FUSIONAUTH_SECRET, tenantId: process.env.FUSIONAUTH_TENANT_ID // Only required if you're using multi-tenancy }),]...
danger
If you're using multi-tenancy, you need to pass in the tenantId option to apply the proper theme.
Instructionsā
tip
An application can be created at https://your-fusionauth-server-url/admin/application.
For more information, follow the FusionAuth 5-minute setup guide .
In the OAuth settings for your application, configure the following.
Redirect URL
Enabled grants