Express Throttle

Request throttling middleware for Express using a token bucket algorithm with sliding window refill. Version 2.0.0 is current stable. Enables per-route rate limiting with configurable burst capacity, rate, and key function (defaults to IP address). Supports half-requests and custom cost per request. Limitations: in-memory storage by default (not shared across processes), and race conditions when using custom external backends under high load. Recommended for single-process apps.