Auth0 Secure User Authentication and Login Flow - n8n Workflow

Developers building internal tools requiring secure user login.
IT teams implementing secure access solutions utilizing Auth0.
Automation specialists looking for advanced n8n templates for identity management.
Users needing a complete, customizable n8n node solution for complex OAuth flows.

This automation provides a secure, reliable, and standardized method for authenticating users using Auth0. This sophisticated n8n workflow solves the complexity of the OAuth 2.0 Authorization Code Grant flow by handling the entire multi-step process: initiating the login prompt, securely receiving the authorization code, exchanging that code for a verified access token, and finally fetching the user's validated profile information. Using this specialized n8n template is crucial for applications requiring external identity validation, ensuring strong security without custom code. This n8n workflow serves as an excellent technical blueprint for integrating external identity providers into any application powered by an n8n backend.

The process is initiated via two separate webhook n8n trigger paths, following the OAuth standard.

1. Initiating Login: The flow starts when a user accesses the /webhook/login n8n trigger. The subsequent Set n8n node prepares the required Auth0 application parameters (Domain, Client ID, Server URL).


2. Redirection: The "Open Auth Webpage" n8n node immediately responds to the trigger by issuing a browser redirect to the Auth0 authorization URL, prompting the user to log in or consent.


3. Code Reception: Upon successful user authentication, Auth0 redirects the browser back to the second n8n trigger path, /webhook/receive-token, supplying a temporary authorization code in the query parameters.


4. Verification and Flow Control: An If n8n node checks for the existence of this authorization code. If the code is missing, the "No Code Found" n8n node stops the process.


5. Token Exchange: If the code is present, the "Request Access Token" http request n8n node performs a critical step: it sends the code, along with the client credentials, to Auth0's token endpoint (/oauth/token). This securely exchanges the temporary code for a verified accesstoken.


6. Profile Retrieval: Finally, the "Get Userinfo" http request n8n node uses the acquired accesstoken as a Bearer token to query the /userinfo endpoint, successfully retrieving the authenticated user's profile details. This sophisticated n8n workflow successfully completes the user verification process.

To deploy this powerful n8n workflow template, follow these steps:

1. Auth0 Application Setup: Create a Single Page Application (SPA) in your Auth0 dashboard.


2. Configure Redirect URIs: In the Auth0 application settings, add the required Allowed Callback URLs. If running n8n locally, use http://localhost:5678 and http://localhost:5678/webhook/receive-token. If self-hosting, replace localhost:5678 with your n8n server address.


3. Import the n8n workflow: Import this JSON into your n8n instance.


4. Configure Credentials (Set n8n node): Locate the "Set Application Details" and "Set Application Details1" n8n nodes. You must accurately populate the following fields with data retrieved from your Auth0 application:

1. Testing: Once the n8n workflow is active, initiate the authentication process by visiting your customized n8n trigger URL: https:///webhook/login.

\/login & \/receive-token (Webhook n8n nodes): These serve as the two required n8n trigger points. The /login trigger initiates the process, while /receive-token acts as the critical callback endpoint for receiving the authorization code.
Set Application Details (Set n8n node): Defines application configuration variables like domain, clientid, and myserver used for constructing the initial redirect URL.
Open Auth Webpage (Respond to Webhook n8n node): A key n8n node that responds to the initial trigger by performing a secure HTTP redirect to the Auth0 authorization endpoint, facilitating the user login.
If (If n8n node): Provides core logic flow control by checking if the required authorization code was passed in the webhook query data before proceeding to token exchange.
Request Access Token (HTTP Request n8n node): Executes the OAuth token exchange. This n8n node sends a POST request to Auth0 with the authorizationcode grant type to retrieve the security tokens.
Get Userinfo (HTTP Request n8n node): The final n8n node in the sequence. It makes a request to the /userinfo endpoint, utilizing the acquired accesstoken as a Bearer token to fetch the verified identity details.