Bucket Rate Limit

A lightweight, bucket-based rate limiter for Node.js that controls request frequency with minimal overhead.

Uses a token bucket: you start with capacity tokens and regain 1 token every intervalMs until the bucket is full again. Call wait() to block until a token is available.

Install

npm i bucket-rate-limit

API

const limiter = new BucketRateLimiter(capacity, intervalMs)

Create a new rate limiter, with parameters:

• capacity: maximum number of tokens (burst size)
• intervalMs: milliseconds per token refill (refills 1 token each interval)

For example:

• capacity = 1 and intervalMs = 200 allows 5 requests per second, and no bursts.
• capacity = 10 and intervalMs = 200 allows bursts up to 10 requests, but still limits long-term throughput to 5 requests per second.
• capacity = 10 and intervalMs = 1000 also allows bursts up to 10 requests, but long-term throughput of just 1 request per second.

await limiter.wait({ abort } = {})

Wait until a token is available. Returns immediately if the capacity is available.

Optional abort: a promise that can cause the wait to abort by rejecting. Default is to not support aborting (so it will keep waiting until a token is available).

limiter.destroy()

Destroy the rate limiter: stops refilling the bucket and aborts any pending waits.

License

Apache-2.0