Comprehensive Guide to Limiter Best Practices and Useful API Examples

Introduction to Limiter: The limiter is an essential concept in software development,
often used to control the consumption of a finite or rate-limited resource. Common scenarios include regulating
the number of requests to an API or managing concurrent access to shared resources.

Core API Examples:

  
    // Basic setup for rate limiting
    const RateLimiter = require('limiter').RateLimiter;

    const limiter = new RateLimiter({ tokensPerInterval: 5, interval: 'second' });
    
    async function makeRequest() {
      await limiter.removeTokens(1);
      console.log('Sending request...');
    }
  

  
    // Token Bucket Algorithm
    const { RateLimiterMemory } = require('limiter');

    const rateLimiter = new RateLimiterMemory({ points: 5, duration: 1 });

    rateLimiter.consume('user-123')
      .then(() => {
        console.log('Request allowed');
      })
      .catch(() => {
        console.log('Too many requests');
      });
  

  
    // Leaky Bucket Algorithm
    const { RateLimiterQueue } = require('limiter');

    const rateLimiter = new RateLimiterQueue({
      maxQueueSize: 10,
    });

    rateLimiter.schedule(() => {
      console.log('Processing request');
      return Promise.resolve();
    });
  

Application Example:

  
    const express = require('express');
    const { RateLimiterMemory } = require('limiter');
    
    const app = express();
    const port = 3000;

    const rateLimiter = new RateLimiterMemory({ points: 5, duration: 1 });

    app.get('/', async (req, res) => {
      try {
        await rateLimiter.consume(req.ip);
        res.send('Hello, world!');
      } catch {
        res.status(429).send('Too many requests, please try again later.');
      }
    });

    app.listen(port, () => {
      console.log(`Server running at http://localhost:${port}/`);
    });
  

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