Create and Print Buffer

When developing web apps or APIs, it’s critical to prevent users from overwhelming your server. That’s where rate limiting comes in. In this guide, we’ll build a custom rate limiter in Node.js using Redis—no libraries, no magic, just code you control and understand.

• How to use Redis to count and throttle requests
• How to implement reusable middleware in Express
• How to rate limit by IP or API key
• Why this method is better for learning and customization

const socket = io();

const messageForm = document.getElementById('chat-form');
const messageInput = document.getElementById('message');
const messagesList = document.getElementById('messages');

messageForm.addEventListener('submit', (e) => {
    e.preventDefault();
    const message = messageInput.value;
    socket.emit('chatMessage', message);
    messageInput.value = '';
});

socket.on('chatMessage', (message) => {
    const li = document.createElement('li');
    li.textContent = message;
    messagesList.appendChild(li);
});

node server.js

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