What is Express-rate-limit in Node.js ?
Node.js is an open-source and cross-platform runtime environment built on Chrome’s V8 JavaScript engine for executing JavaScript code outside of a browser. You need to recollect that NodeJS isn’t a framework, and it’s not a programming language. It provides an event-driven, non-blocking (asynchronous) I/O and cross-platform runtime environment for building highly scalable server-side applications using JavaScript.
In this article, we will learn about the Express-Rate limit.
Express Rate Limit: Rate limiting prevents the same IP address from making too many requests that will help us prevent attacks like brute force.
Required Dependency:
npm install express-rate-limit
Project Setup: Run the following sets of commands to create a folder and initialize the project.
mkdir test-project cd test-project npm init -y
Project Structure:
Example: Write the below code in the App.js file.
Javascript
// Express is node framework that helps // in setting up the server and routing. const express = require( "express" ); // The express-rate-limit is for // limiting the incoming request. const rateLimit = require( "express-rate-limit" ); // App variable store the express module. const app = express(); // Creating a limiter by calling rateLimit function with options: // max contains the maximum number of request and windowMs // contains the time in millisecond so only max amount of // request can be made in windowMS time. const limiter = rateLimit({ max: 200, windowMs: 60 * 60 * 1000, message: "Too many request from this IP" }); // Add the limiter function to the express middleware // so that every request coming from user passes // through this middleware. app.use(limiter); // GET route to handle the request coming from user app.get( "/" , (req, res) => { res.status(200).json({ status: "success" , message: "Hello from the w3wiki express server" }); }); // Server Setup const port = 8000; app.listen(port, () => { console.log(`app is running on port ${port}`); }); |
Steps to run the application: Run the below command in the terminal:
node app.js
Output: We will see the following output on the terminal screen.
app is running on http://localhost:8000/
- Output when a request doesn’t exceed the max limit of the rate limiter:
- Output when a request exceeds the max limit of the rate limiter:
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