Author: Arunangshu Das

In today’s fast-paced software development landscape, DevOps has emerged as a critical practice that integrates software development (Dev) and IT operations (Ops). One of the core tenets of DevOps is ensuring the reliability, availability, and performance of applications in production. A key aspect of achieving these goals is through effective monitoring and logging. This blog post will delve into how monitoring and logging work in a DevOps environment, their significance, and best practices for implementation. What is Monitoring in DevOps? Monitoring refers to the process of continuously assessing the performance, availability, and health of software applications and infrastructure. It involves…

In the era of modern web applications and APIs, token-based authentication has become a cornerstone of secure authorization practices. Developers now rely on tokens to provide scalable, stateless, and secure mechanisms for authenticating users. Among these, JSON Web Token (JWT) has gained immense popularity for its simplicity. However, as security demands evolve, alternatives like Platform-Agnostic Security Tokens (Paseto) are emerging, addressing vulnerabilities inherent in JWT. How Does Token-Based Authentication Work? Token-based authentication shifts away from server-side session storage by issuing tokens to authenticated clients. Here’s how the process typically unfolds: User Login: Users provide their credentials (username and password). Authentication:…

Memory leaks are among the most common and challenging issues in web development. They can lead to sluggish performance, unresponsive applications, and even crashes. Fortunately, Chrome DevTools provides robust tools to analyze and debug memory leaks effectively. 1. What Are Memory Leaks? A memory leak occurs when memory that is no longer needed is not released. In JavaScript, memory is managed via garbage collection (GC). The garbage collector automatically identifies and reclaims unused memory. However, when references to objects persist unintentionally, the garbage collector cannot clean them up, leading to a memory leak. Over time, these leaks can consume significant…

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…