Rate Limiter

npm install @ferrow/rate-limiter-js

Dead-simple, in-memory rate limiting. Sliding window with minimal overhead.

const limiter = new RateLimiter({ maxRequests: 100, windowMs: 60000 });

if (limiter.tryConsume(userId)) {
  // Handle request
} else {
  // Reject: rate limit exceeded
}

Features

• Sliding window algorithm (accurate)
• In-memory backend
• TypeScript
• Zero dependencies

Use Cases

• REST API throttling
• WebSocket rate limiting
• Database query budgeting
• File upload limits

Performance

• Memory: O(1) amortized per check
• State is per-process (not shared across instances/servers)

License: MIT

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Sponsored by Ferrow

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Part of the ferrow-toolkit collection · Sponsored by Ferrow