Author: Arunangshu Das

Mobile web traffic has grown exponentially, and developers must ensure websites deliver seamless experiences on various screen sizes and devices. Simulating mobile devices while developing can save time, streamline testing, and help you identify potential issues early. Chrome DevTools offers a robust Device Mode that allows you to emulate mobile devices directly within your browser. Why Simulate Mobile Devices? Before diving into the tools, let’s understand why mobile device simulation is important: Rapid Testing: Instantly test how your website looks and behaves on different devices without the need for physical devices. Responsive Design: Verify if your responsive layouts adapt correctly…

Preparing for a software development interview can feel overwhelming. From coding challenges to behavioral questions, the process tests both technical and interpersonal skills. Here are ten common questions you might encounter, along with tips on how to answer them effectively. 1. Can you explain the difference between Object-Oriented Programming (OOP) and Functional Programming (FP)? Why it’s asked: Interviewers want to assess your understanding of programming paradigms. How to answer: Highlight that OOP organizes code using objects, classes, and inheritance, focusing on state and behavior. Explain that FP emphasizes immutability, pure functions, and avoiding shared state. Use examples: “In OOP, you…

Integration testing is a critical aspect of developing reliable full-stack Node.js applications. While unit tests ensure that individual components of the application work as expected, integration tests validate that multiple components or services work together seamlessly. Why Integration Tests Matter Ensures Functional Harmony: They verify that different layers of your application—such as the frontend, backend, and database—interact correctly.Reduces Risk of Bugs: Bugs often emerge at the seams between systems. Integration tests catch these issues early.Improves Confidence: With proper tests, you can refactor your code without fear of breaking existing functionality. Key Concepts Integration tests for Node.js applications often focus on…

Handling traffic spikes is a challenge for modern web applications, especially when built using Node.js. Whether it’s a sudden influx due to a product launch, promotional event, or viral content, your application needs to remain performant. This is where load testing comes into play—and one of the best tools to achieve this is Artillery. Artillery is a modern, powerful, and easy-to-use load testing toolkit for developers. Why Load Testing Matters Imagine releasing an exciting feature and promoting it to your audience, only to have your application crash due to unanticipated demand. The consequences include lost revenue, user dissatisfaction, and damage…

End-to-end testing is a vital component of software development, ensuring that your application behaves as expected across its entire workflow. When working with Node.js, tools like Mocha and Chai provide a powerful combination for writing robust unit and end-to-end tests. What is Mocha? Mocha is a popular JavaScript testing framework running on Node.js, providing developers with features for asynchronous testing, test case grouping, and custom reporting. What is Chai? Chai is an assertion library that works seamlessly with Mocha. It provides readable and expressive assertions, making your test cases more understandable. Step-by-Step Guide to Setting Up Mocha and Chai 1.…

As Node.js continues to be a leading framework for developing high-performance web applications, security concerns have grown alongside its popularity. Web applications are a prime target for attackers, and ignoring security flaws can lead to catastrophic outcomes like data breaches, service downtime, or reputational damage. 1. Injection Attacks What is it?Injection attacks, like SQL injection or command injection, occur when an attacker sends untrusted input to an interpreter, tricking it into executing malicious commands. How to Protect: Use Parameterized Queries: Avoid constructing SQL queries with string interpolation. Use libraries like pg for PostgreSQL or mongoose for MongoDB to sanitize queries.Validate…

APIs are the backbone of modern applications, enabling communication between diverse systems and devices. However, when dealing with high-traffic APIs, one of the biggest challenges is ensuring availability while preventing abuse. Rate limiting and abuse prevention strategies play a crucial role in managing these concerns effectively. What Is API Rate Limiting? Rate limiting is the process of controlling how often a client can make requests to an API within a specified period. This mechanism helps protect APIs from being overwhelmed by excessive traffic, whether intentional (e.g., DDoS attacks) or unintentional (e.g., buggy client code). Why Is Rate Limiting Important? Prevents…

WebSockets have become a pivotal part of modern real-time applications, enabling full-duplex communication between clients and servers. From chat applications to live stock trading, WebSockets offer immense benefits. However, their persistent connections make them vulnerable to Distributed Denial of Service (DDoS) and brute force attacks. For developers using Node.js, securing WebSocket implementations is critical to ensure reliable and secure applications. Understanding WebSocket Vulnerabilities Unlike traditional HTTP requests, WebSockets maintain open connections for extended periods. While this feature is efficient for real-time data exchange, it exposes several attack surfaces: DDoS Attacks: Attackers flood the WebSocket server with connection requests, consuming server…

In modern applications, security is paramount. Role-Based Access Control (RBAC) is a powerful way to manage access to resources by assigning roles to users. Coupled with JSON Web Token (JWT) authentication, RBAC becomes a seamless and secure method for protecting routes in your Node.js application. 1. What is Role-Based Access Control? Role-Based Access Control (RBAC) restricts access based on users’ roles. For example: Admin: Can manage all resources.Editor: Can modify content but not delete it.Viewer: Can only view content. RBAC ensures users can only perform actions permitted for their role, reducing security vulnerabilities. 2. Why Use JWT for Authentication? JWT…