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Every week, another company makes headlines for a data breach or a site that crawled to a halt under normal traffic. In most cases, the root cause was not some sophisticated attack or freak server failure. It was a mistake that had been sitting quietly in the codebase for months, waiting to be notic
A quick note before we start: this post is for beginners trying to understand how closures actually work. I have done my best as per my limited knowledge to explain what happens under the hood, so if I have gotten anything wrong, please correct me in the comments. When I was first learning closures,
Building an AI Chatbot Using AWS Bedrock and JavaScript I recently worked on building a full-stack AI chatbot using AWS Bedrock and JavaScript. The goal of this project was not just to create a chatbot interface, but to understand how modern AI applications are built end-to-end using foundation mode
JavaScript Practice Coding Examples Table of Contents Easy Level Medium Level Hard Level Array Manipulation String Manipulation Object & Data Structures Recursion & Algorithms Functional Programming Async & Promises DOM & Browser APIs Problem: Given an array of integers nums and an integer target, r
JavaScript operators are symbols or keywords used to perform operations on values and variables. They are the building blocks of JavaScript expressions and can manipulate data in various ways. 1. Arithmetic Operator Arithmetic operators take numerical values (either literals or variables) as their o
Client and Server Side in JavaScript There are 3 major types of JavaScript namely: Client-Side JavaScript (CSJS) -- an extended version of JavaScript that enables the enhancement and manipulation of web pages and client browsers Server-Side JavaScript (SSJS) -- an extended version of JavaScript that
Debugging JavaScript: The Guide I Wish I Had Earlier (2026) Debugging is a skill. A learnable skill. Here's how to find and fix bugs faster. Before touching any tool: 1. Reproduce the bug consistently → Can you make it happen every time? → What are the EXACT steps? → What's different when it works v
Testing JavaScript: A Practical Guide to TDD with Jest (2026) Testing isn't optional anymore. Here's how to actually do it — with real examples you can copy. Without tests: → You're scared to refactor (what if I break something?) → Bugs get reintroduced ("regressions") → Code reviews take forever (r
Most JavaScript developers have been bitten by URL encoding at some point. You build a query string, pass it to fetch(), and suddenly your API returns 400. The culprit? You used encodeURI() when you should have used encodeURIComponent(). JavaScript gives us two encoding functions, and they serve dif
Originally published on the Cosmic blog. Bun v1.3 is the fastest JavaScript runtime you can use right now. Cosmic's REST API returns content in under 100ms. Put them together and you get a full-stack setup that's faster at every layer: cold starts, package installation, HTTP requests, and content de