api-rate-limiting

npx skills add majiayu000/claude-skill-registry --skill api-rate-limiting-aj-geddes-useful-ai-prompts-2 --agent claude-code

Same command for any agent — swap --agent for codex, cursor, copilot.

# API Rate Limiting ## Overview Protect APIs from abuse and manage traffic using various rate limiting algorithms with per-user, per-IP, and per-endpoint strategies. ## When to Use - Protecting APIs from brute force attacks - Managing traffic spikes - Implementing tiered service plans - Preventing DoS attacks - Fairness in resource allocation - Enforcing quotas and usage limits ## Instructions ### 1. **Token Bucket Algorithm** ```javascript // Token Bucket Rate Limiter class TokenBucket { constructor(capacity, refillRate) { this.capacity = capacity; this.tokens = capacity; this.refillRate = refillRate; // tokens per second this.lastRefillTime = Date.now(); } refill() { const now = Date.now(); const timePassed = (now - this.lastRefillTime) / 1000; const tokensToAdd = timePassed * this.refillRate; this.tokens = Math.min(this.capacity, this.tokens + tokensToAdd); this.lastRefillTime = now; } consume(tokens = 1) { this.refill(); if (this.tokens >= tokens) { this.tokens -= tokens; return true; } return false; } available() { this.refill(); return Math.floor(this.tokens); } } // Express middleware const express = require('express'); const app = express(); const rateLimiters = new Map();