Backend JWT Authentication

About

This skill provides a standardized framework for implementing robust security in Python-based backends, specifically focusing on FastAPI. It guides the creation of JWT verification middleware, secure password hashing using bcrypt, and critical user isolation patterns that prevent unauthorized data access by matching token subjects to resource paths. By leveraging a shared secret approach compatible with Better Auth, it ensures seamless and secure communication between frontend and backend components in full-stack applications.

Key Features

• Environment-based configuration for Better Auth secret integration
• Automated user isolation and ID validation in API routes
• Secure password hashing and verification using bcrypt
• JWT token verification middleware for FastAPI dependencies
• Standardized token generation with HS256 and configurable expiration
• 3 GitHub stars

Use Cases

• Securing REST API endpoints for user-specific data like Todo lists
• Building secure signup and signin workflows with multi-claim JWTs
• Implementing shared-secret authentication between a frontend and FastAPI backend