Express Rate Limiting Middleware

express-rate-limit is a middleware for Express.js that provides basic IP-based rate limiting to protect endpoints from abuse, such as brute-force attacks on login or password reset forms, or excessive API requests. The current stable version is 8.3.2, and the package maintains an active release cadence, with multiple minor and patch updates within recent months, indicating ongoing development and support. Key differentiators include its flexible configuration for `windowMs` and `limit`, support for various external data stores (beyond its built-in memory store), and compliance with the IETF RateLimit header specification (draft-6, draft-7, and draft-8), allowing for modern and standardized rate limiting headers. It also includes `ipv6Subnet` configuration for granular IPv6 handling and integrates well with related packages like `express-slow-down`.