Science Knowings: JavaScript Course For Social Media

API Rate Limiting

Previously on: API Authentication (JWT)

In the last session, we covered API Authentication using JSON Web Tokens (JWTs). We learned how to create and verify JWTs to secure our APIs and protect sensitive data.

What is API Rate Limiting?

API Rate Limiting is a technique used to control the number of requests a client can make to an API within a specific period.

When Should I Use API Rate Limiting?

API Rate Limiting is essential for:

  • Preventing API abuse and malicious attacks
  • Ensuring API stability and performance
  • Protecting sensitive data and resources

How Does API Rate Limiting Work?

Rate limiting algorithms track the number of requests made by a client and apply restrictions based on predefined limits.

Benefits of API Rate Limiting

Benefits of API rate limiting include:

  • Improved API security
  • Reduced server load and improved performance
  • Prevention of Denial of Service (DoS) attacks

Types of API Rate Limiting

Common types of API rate limiting algorithms include:

  • Token Bucket Algorithm
  • Leaky Bucket Algorithm
  • Sliding Window Algorithm
  • Fixed Window Algorithm

Token Bucket Algorithm

function rateLimit(request) {
  if (bucket.tokens > 0) {
    bucket.tokens--;
    return true;
  } else {
    return false;
  }
}

Leaky Bucket Algorithm

function rateLimit(request) {
  bucket.tokens += rate;
  if (bucket.tokens > capacity) {
    bucket.tokens = capacity;
  }
  if (bucket.tokens < request) {
    return false;
  } else {
    bucket.tokens -= request;
    return true;
  }
}

Sliding Window Algorithm

function rateLimit(request) {
  let window = requests[currentTime - windowSize];
  if (window + request <= limit) {
    window += request;
    requests[currentTime] = window;
    return true;
  } else {
    return false;
  }
}

Fixed Window Algorithm

function rateLimit(request) {
  let window = requests[currentTime];
  if (window + request <= limit) {
    window += request;
    requests[currentTime] = window;
    return true;
  } else {
    return false;
  }
}

Rate Limiting with Node.js

const rateLimit = require("express-rate-limit");

app.use(rateLimit({
  windowMs: 60 * 1000, // 1 minute
  max: 100, // Limit each IP to 100 requests per windowMs
}));

Rate Limiting with Express.js

const rateLimit = require("express-rate-limit");

app.use(rateLimit({
  windowMs: 60 * 1000, // 1 minute
  max: 100, // Limit each IP to 100 requests per windowMs
}));

Rate Limiting with AWS API Gateway

AWS API Gateway provides built-in rate limiting features. You can configure rate limits for individual APIs and methods through the AWS console or API Gateway REST API template.

Rate Limiting Best Practices

Best practices for API rate limiting include:

  • Start with a reasonable limit and adjust as needed
  • Monitor your APIs and analyze rate limiting logs
  • Consider using a combination of rate limiting algorithms
  • Inform developers about rate limits and error responses

Next Topic: API Caching

In the next session, we'll dive into API Caching techniques. We'll learn how to store frequently requested data to reduce server load and improve API performance. Follow us to stay updated!