@SagarKemble

Creating Routes and Handling Requests with Express

1h ago · 6 min read · You wanted to build a simple API. So you opened the Node.js docs, wrote an http.createServer(), started checking req.url and req.method inside one giant if/else chain, and somewhere around the third r

Async/Await in JavaScript

1h ago · 6 min read · You've seen the code. A .then() chained to another .then(), a .catch() somewhere in the middle, and by the end you're squinting at indentation levels like you're trying to decode ancient runes. It wor

Error Handling in JavaScript: Try, Catch, Finally and throwing Custom Errors

17h ago · 7 min read · The App That Worked Fine Until It Did Not You built something. It worked on your machine. It worked in testing. Then a user typed something unexpected into a form, a network request came back empty, o

String Polyfills and Common Interview Methods

1d ago · 5 min read · The Method You've Used a Hundred Times You have called .toUpperCase(). You have called .includes(). You have chained .trim().split(",").map(...) without thinking twice. It works, so you move on. Then

Node.js is Single-Threaded. So How Does It Handle Thousands of Requests?

1d ago · 5 min read · The Question Nobody Thinks You've heard it before. "Node.js is single-threaded." And you have also head "Node.js scales really well." But have you wondering how those two sentences live in the same un