Introduction

Throttlr — a cloud-native rate limiting service for your APIs.

What is Throttlr?

Throttlr is a hosted rate limiting service that protects your APIs from abuse and overuse. Instead of building rate limiting logic into every service yourself, you define rules once in the dashboard and enforce them everywhere via our lightweight SDK.

Quickstart

Get up and running in under 5 minutes.

SDK Reference

Install and use the Node.js SDK in your project.

Concepts

Understand how rate limiting works under the hood.

API Reference

Explore the full REST API.

Key Features

Multiple Algorithms

Choose between Fixed Window and Sliding Window rate limiting algorithms per rule. Fixed Window is great for simple burst control; Sliding Window gives smoother, more accurate limiting.

Project Isolation

Each project gets its own API key. Rules, logs, and usage data are fully isolated between projects — perfect for multi-tenant SaaS products.

Real-time Request Logs

Every request checked through the SDK is logged. Filter logs by status (allowed/blocked) or rule name directly from the dashboard.

Express Middleware

Drop the RateLimitermiddleware into your Express app in one line. No boilerplate — it just works.

How it works in 30 seconds

1. Sign up → Create a project → Get your API key
2. Define a Rule (e.g. "max 10 requests per minute")
3. Install the SDK in your Node.js app
4. Call limiter.check({ identifier, rule }) before your handler
5. View live request logs in the dashboard