Authenticate A User In A Workflow With Openid Connect 1997 – n8n Workflows – Free Template

What This Workflow Does

This n8n workflow implements an OpenID Connect (OIDC) client authentication flow. It enables secure user authentication through an identity provider, allowing you to retrieve user profile information and manage authentication tokens within your automation workflows.

How It Works

The workflow follows the OIDC authentication standard by:

• Accepting authentication requests through a webhook endpoint
• Retrieving authorization and token URLs from your identity provider
• Exchanging authorization codes for access tokens
• Fetching authenticated user information from the userinfo endpoint
• Processing conditional logic based on authentication success or failure
• Returning authentication results to the client

Use Cases

• Implementing single sign-on (SSO) integration with enterprise identity providers like Okta, Azure AD, or Keycloak
• Automating user onboarding workflows that require identity verification before account creation
• Building secure API authentication systems that delegate user management to external identity providers
• Creating multi-tenant applications where each tenant uses their own identity provider
• Establishing secure webhooks that verify caller identity before processing requests

Nodes Used

• Webhook – Receives incoming authentication requests from users or applications
• Code – Executes JavaScript to process authentication logic and data transformation
• HTTP Request – Makes API calls to identity provider endpoints for tokens and user information
• Respond to Webhook – Sends authentication results back to the requesting client
• If – Implements conditional branching based on authentication status
• HTML – Generates HTML responses for user-facing authentication pages
• Sticky Note – Provides workflow documentation and configuration reminders
• Set – Stores and manages variables throughout the authentication process

Prerequisites

• Access to an OIDC-compliant identity provider (such as Okta, Auth0, Azure AD, or Keycloak)
• Client ID obtained from your identity provider’s application registration
• Client secret (if not using PKCE authentication method)
• Authorization URL, Token URL, and UserInfo URL from your identity provider
• Configured redirect URI matching your n8n webhook URL
• At minimum, the “openid” scope enabled in your identity provider application settings
• Understanding of OAuth 2.0 and OpenID Connect authentication flows

Difficulty Level

Advanced – This workflow requires knowledge of OIDC protocols, identity provider configuration, and secure credential management. It is recommended for users with experience in authentication systems and OAuth implementations.

This workflow template is shared under the n8n fair-code license. Free to use and modify.