JWT Auth Manager
Production-ready TypeScript JWT authentication library with advanced security features and built-in rate limiting.
Overview
JWT Auth Manager is a comprehensive, functional TypeScript library designed for building secure authentication systems. It provides enterprise-grade JWT token management with advanced security features including token rotation, concurrent usage detection, device fingerprinting, and comprehensive rate limiting protection.
The library follows a functional programming approach with pure functions and immutable operations, making it highly testable and maintainable. It's designed to work with any database through a flexible storage interface and includes ready-to-use Express.js middleware for quick integration. With built-in brute force protection, IP whitelist/blacklist capabilities, and real-time security alerts, it provides production-ready authentication out of the box.
Key Features
- Secure JWT token generation and verification with automatic rotation
- Concurrent token usage detection and prevention
- Device fingerprinting and location tracking support
- Built-in rate limiting with IP-based request throttling
- Brute force protection with automatic account lockout
- IP whitelist/blacklist management
- Real-time security alerts via webhook and email
- Express.js middleware for easy integration
- Flexible storage interface (MongoDB, PostgreSQL, Redis examples included)
- Full TypeScript support with complete type safety
- Functional design with pure functions for easy testing
- Production-ready with comprehensive error handling
Challenges & Solutions
The main challenge was designing a flexible architecture that could work with any database while maintaining type safety and security best practices. We implemented a functional programming approach with dependency injection, allowing developers to use their preferred storage solution. Another significant challenge was implementing concurrent token usage detection without impacting performance - this was solved by using an efficient token marking system that detects replay attacks while maintaining fast token refresh operations. Balancing security features like rate limiting and brute force protection with developer experience required careful API design to make the library both powerful and easy to use.