If you've ever seen this error in your browser: Access to fetch at 'https://api.example.com' from origin 'http://localhost:3000' has been blocked by CORS policy You probably thought: “Why is this happening? My API works!” Let’s understand what CORS is,

When working with asynchronous code in JavaScript, you often need to run multiple promises at the same time. For example: * Fetching data from multiple API endpoints * Uploading several files simultaneously * Running multiple database queries * Processing multiple asynchronous tasks in parallel Handling these operations one by one can make your application

In JavaScript, variables are used to store data. But there are three different ways to declare variables: * var * let * const They look similar… but they behave very differently. Let’s break it down clearly. 🔹 What is a Variable? A variable is a container that stores a value. Example: let name

JavaScript is single-threaded. But it can handle: * API calls * Timers * File reads * Async operations How? You already learned about the Event Loop. Now let’s understand one of the most important tools that works with it: Promises 🔹 The Problem Before Promises Before Promises, async code looked like this: setTimeout(function(

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How the JavaScript Event Loop Works JavaScript is single-threaded — meaning it can only do one thing at a time. So how does JavaScript handle things like: * API requests * timers (setTimeout) * user clicks * animations …without blocking the page? The answer is: the Event Loop. Let’s understand how it works step-by-step.

When building APIs, one of the most common questions is: Should I use REST or GraphQL? Both are widely used, powerful, and solve similar problems — but in very different ways. This article compares REST and GraphQL from a practical developer perspective so you can choose the right one for your

APIs can sound complicated — especially if you are new to programming. Terms like: * REST API * GraphQL * Endpoints * JSON * Requests and Responses …can be overwhelming. So let’s understand what an API really is using a simple, real-world analogy: a restaurant and a waiter. 🔹 The Real-World Problem Imagine you go to

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