Generate Secure User Authentication with One Webhook Streamline user onboarding and security for your applications using this n8n workflow. This template handles signup, login, and password resets through a single endpoint, making it ideal for developers building MVPs or scaling apps without a full authentication backend. Who Is This For? This workflow is designed for: Developers, indie hackers, and teams building web, mobile, or API-driven applications. Those who need a quick and secure authentication layer. Anyone tired of writing custom auth code or managing third-party services like Auth0 for simple needs. This template integrates seamlessly into your n8n setup. What Problem Does This Workflow Solve? Building authentication from scratch is time-consuming and complex: User Management: Managing registration, credential verification, and password recovery can take weeks of development time. Security: Ensuring secure password hashing, case-insensitive email matching, and robust error handling adds significant complexity. Integration: Creating consistent APIs for apps (e.g., React Native, Next.js, Flutter) is challenging. This workflow provides a battle-tested, webhook-based authentication system that is: Database-agnostic (works with PostgreSQL/Supabase). Extensible—deploy once and integrate across all your apps. What This Workflow Does The workflow handles authentication tasks through a single webhook endpoint, offering the following functionality: Webhook Entry: Listens for POST requests at /webhook/auth. Processes a simple JSON payload, routing actions via a "path" parameter (signup, signin, forgot). Signup: Inserts new users into your database. Uses bcrypt-hashed passwords (via pgcrypto). Returns user details in the response. Login: Queries for case-insensitive email matches. Verifies passwords securely. Returns user information on successful login. Forgot Password: Generates a random 8-character password. Updates the password hash in the database. Returns the new password (suitable for email delivery). Routing & Validation: Uses n8n Switch and IF nodes to securely handle paths and credentials. Standardized Responses: Outputs clean JSON with status, message, and data for easy frontend parsing. Error Handling: Gracefully manages invalid inputs, duplicate entries, or database errors. No more boilerplate—get authentication up and running in minutes! Setup Instructions Follow these steps to set up the workflow: Connect Your Accounts: Use PostgreSQL or Supabase for user storage (free tiers are sufficient). Enable the following PostgreSQL extensions: uuid-ossp and pgcrypto. Create the Users Table: sqlCREATE TABLE users ( id uuid PRIMARY KEY DEFAULT uuid_generate_v4(), full_name text NOT NULL, email text UNIQUE NOT NULL, password_hash text NOT NULL, created_at timestamptz DEFAULT now() ); Configure Credentials : Add PostgreSQL credentials to the n8n nodes ("Signup", "Login", "Reset Password"). Import the JSON workflow into n8n. Activate the workflow. Test the Workflow: Use Postman or curl to send requests to the auto-generated webhook URL. How to Customize This Workflow Extend the workflow to fit your specific needs with these modifications: Add JWT Sessions: Insert a node after successful login to generate and sign JWT tokens (e.g., using the Crypto node). Email Integration: Add a SendGrid or Mailgun node to the "Forgot Password" flow to automatically send new credentials. Rate Limiting: Include an HTTP Request node to check usage quotas before processing requests. Multi-Database Support: Replace PostgreSQL with MySQL or MongoDB by updating the query nodes. Frontend Enhancements: Extend JSON responses to include user avatars or roles by joining additional tables in SQL queries. Triggers: Add a Schedule node for batch user imports. Include a webhook for external authentication calls.