Socket
Socket
Sign inDemoInstall

rate-limiter-flexible

Package Overview
Dependencies
0
Maintainers
1
Versions
160
Alerts
File Explorer

Advanced tools

Install Socket

Detect and block malicious and high-risk dependencies

Install

rate-limiter-flexible

Node.js rate limiter by key and protection from DDoS and Brute-Force attacks in process Memory, Redis, MongoDb, Memcached, MySQL, PostgreSQL, Cluster or PM


Version published
Maintainers
1
Weekly downloads
397,897
decreased by-2.38%

Weekly downloads

Readme

Source

npm version npm node version deno version

Logo

node-rate-limiter-flexible

rate-limiter-flexible counts and limits number of actions by key and protects from DDoS and brute force attacks at any scale.

It works with Redis, process Memory, DynamoDB, Cluster or PM2, Memcached, MongoDB, MySQL, PostgreSQL and allows to control requests rate in single process or distributed environment.

Memory limiter also works in browser.

Atomic increments. All operations in memory or distributed environment use atomic increments against race conditions.

Allow traffic bursts with BurstyRateLimiter.

Fast. Average request takes 0.7ms in Cluster and 2.5ms in Distributed application. See benchmarks.

Flexible. Combine limiters, block key for some duration, delay actions, manage failover with insurance options, configure smart key blocking in memory and many others.

Ready for growth. It provides unified API for all limiters. Whenever your application grows, it is ready. Prepare your limiters in minutes.

Friendly. No matter which node package you prefer: redis or ioredis, sequelize/typeorm or knex, memcached, native driver or mongoose. It works with all of them.

In memory blocks. Avoid extra requests to store with inMemoryBlockOnConsumed.

Deno compatible See this example

It uses fixed window as it is much faster than rolling window. See comparative benchmarks with other libraries here

Installation

npm i --save rate-limiter-flexible

yarn add rate-limiter-flexible

Import

// CommonJS
const { RateLimiterMemory } = require("rate-limiter-flexible");

// or

// ECMAScript 
import { RateLimiterMemory } from "rate-limiter-flexible";
// or
import RateLimiterMemory from "rate-limiter-flexible/lib/RateLimiterMemory.js";

Basic Example

Points can be consumed by IP address, user ID, authorisation token, API route or any other string.

const opts = {
  points: 6, // 6 points
  duration: 1, // Per second
};

const rateLimiter = new RateLimiterMemory(opts);

rateLimiter.consume(remoteAddress, 2) // consume 2 points
    .then((rateLimiterRes) => {
      // 2 points consumed
    })
    .catch((rateLimiterRes) => {
      // Not enough points to consume
    });
RateLimiterRes object

Both Promise resolve and reject return object of RateLimiterRes class if there is no any error. Object attributes:

RateLimiterRes = {
    msBeforeNext: 250, // Number of milliseconds before next action can be done
    remainingPoints: 0, // Number of remaining points in current duration 
    consumedPoints: 5, // Number of consumed points in current duration 
    isFirstInDuration: false, // action is first in current duration 
}

You may want to set next HTTP headers to response:

const headers = {
  "Retry-After": rateLimiterRes.msBeforeNext / 1000,
  "X-RateLimit-Limit": opts.points,
  "X-RateLimit-Remaining": rateLimiterRes.remainingPoints,
  "X-RateLimit-Reset": new Date(Date.now() + rateLimiterRes.msBeforeNext)
}

Advantages:

Full documentation is on Wiki

Middlewares, plugins and other packages

Some copy/paste examples on Wiki:

Migration from other packages

  • express-brute Bonus: race conditions fixed, prod deps removed
  • limiter Bonus: multi-server support, respects queue order, native promises

Docs and Examples

Changelog

See releases for detailed changelog.

Basic Options

  • points

    Default: 4

    Maximum number of points can be consumed over duration

  • duration

    Default: 1

    Number of seconds before consumed points are reset.

    Never reset points, if duration is set to 0.

  • storeClient

    Required for store limiters

    Have to be redis, ioredis, memcached, mongodb, pg, mysql2, mysql or any other related pool or connection.

Other options on Wiki:

Smooth out traffic picks:

Specific:

API

Read detailed description on Wiki.

Benchmark

Average latency during test pure NodeJS endpoint in cluster of 4 workers with everything set up on one server.

1000 concurrent clients with maximum 2000 requests per sec during 30 seconds.

1. Memory     0.34 ms
2. Cluster    0.69 ms
3. Redis      2.45 ms
4. Memcached  3.89 ms
5. Mongo      4.75 ms

500 concurrent clients with maximum 1000 req per sec during 30 seconds

6. PostgreSQL 7.48 ms (with connection pool max 100)
7. MySQL     14.59 ms (with connection pool 100)

Note, you can speed up limiters with inMemoryBlockOnConsumed option.

Contribution

Appreciated, feel free!

Make sure you've launched npm run eslint before creating PR, all errors have to be fixed.

You can try to run npm run eslint-fix to fix some issues.

Any new limiter with storage have to be extended from RateLimiterStoreAbstract. It has to implement 4 methods:

  • _getRateLimiterRes parses raw data from store to RateLimiterRes object.

  • _upsert may be atomic or non-atomic upsert (increment). It inserts or updates value by key and returns raw data. If it doesn't make atomic upsert (increment), the class should be suffixed with NonAtomic, e.g. RateLimiterRedisNonAtomic.

    It must support forceExpire mode to overwrite key expiration time.

  • _get returns raw data by key or null if there is no key.

  • _delete deletes all key related data and returns true on deleted, false if key is not found.

All other methods depends on store. See RateLimiterRedis or RateLimiterPostgres for example.

Note: all changes should be covered by tests.

Keywords

FAQs

Last updated on 15 Feb 2024

Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.

Install

Related posts

SocketSocket SOC 2 Logo

Product

  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap

Stay in touch

Get open source security insights delivered straight into your inbox.


  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc