Code → https://github.com/abhishekraut01/DailyCode/blob/main/DDos/Attack/src/index.ts

🧠 What is Rate Limiting?

Rate limiting is a protection mechanism used to control how many requests a user (or IP/email/token) can make to your server in a given time window.

It’s like a speed governor on an API — it prevents abuse, brute-force attacks, and server overload.

Note → You can copy paste the code on GPT from my GitHub repo and ask to explain how DDOS works and why we rate limit the critical endpoints

⚙️ How It Works Internally

Here’s the core logic every rate limiter follows:

  1. Identify the user/client

    → using IP, email, API key, JWT, etc.

  2. Track how many requests they made in a time window (e.g. 1 min, 1 hour).

  3. Allow or block based on configured thresholds.

📦 The Library You Used — express-rate-limit

This middleware automatically handles all of that for you.

Under the hood, it stores request counts (in memory by default) and resets counts after windowMs expires.

You can also configure it to use Redis, Memcached, or a distributed store if you have multiple backend instances — we’ll talk about that soon.

🔍 Let’s Decode Your Code Step-by-Step

1️⃣ Import the Middleware