Implements API rate limiting using token bucket, sliding window, and Redis-based algorithms to protect against abuse. Use when securing public APIs, implementing tiered access, or preventing denial-of-service attacks.
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Protect APIs from abuse using rate limiting algorithms with per-user and per-endpoint strategies.
| Algorithm | Pros | Cons |
|---|---|---|
| Token Bucket | Handles bursts, smooth | Memory per user |
| Sliding Window | Accurate | Memory intensive |
| Fixed Window | Simple | Boundary spikes |
class TokenBucket {
constructor(capacity, refillRate) {
this.capacity = capacity;
this.tokens = capacity;
this.refillRate = refillRate; // tokens per second
this.lastRefill = Date.now();
}
consume() {
this.refill();
if (this.tokens >= 1) {
this.tokens--;
return true;
}
return false;
}
refill() {
const now = Date.now();
const elapsed = (now - this.lastRefill) / 1000;
this.tokens = Math.min(this.capacity, this.tokens + elapsed * this.refillRate);
this.lastRefill = now;
}
}
const rateLimit = require('express-rate-limit');
const limiter = rateLimit({
windowMs: 15 * 60 * 1000, // 15 minutes
max: 100,
standardHeaders: true,
message: { error: 'Too many requests, try again later' }
});
app.use('/api/', limiter);
X-RateLimit-Limit: 100
X-RateLimit-Remaining: 45
X-RateLimit-Reset: 1705320000
Retry-After: 60
| Tier | Requests/Hour |
|---|---|
| Free | 100 |
| Pro | 1,000 |
| Enterprise | 10,000 |
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