One of the problems with localStorage is it takes in only string values. If you want to save an object, you have to convert it into JSON with JSON.stringify. When you retrieve objects from localStorage, you need to convert the JSON value back into JavaScript with JSON.parse // Saving object…

Many people are trapped in tutorial hell — they hop from one tutorial to another, to another, to another, never building something on their own. And they’re ashamed of it. Don’t be ashamed of tutorial hell. You go through tutorials for many reasons: To learn to build something you don’t…

Browsers handle cookie expiry so they don’t pass the cookie’s expiry value to the server. You have to make some adjustments if you want to get the cookie’s expiry value on the server. There are two methods: You can create a cookie with a JSON value You can use another…

I went about researching web security recently as I was writing Understanding Asynchronous JavaScript — I wanted to make sure my recommendations were secure and I’m not doing any of my students a disservice with my recommendations. Unfortunately, articles in the security space were pretty hard to understand. There were…

JavaScript is a strange language. Once in a while, you have to deal with a callback that’s in another callback that’s in yet another callback. People affectionately call this pattern the callback hell. It kinda looks like this: firstFunction(args, function() { secondFunction(args, function() { thirdFunction(args, function()…

Basic async and await is simple. Things get a bit more complicated when you try to use await in loops. In this article, I want to share some gotchas to watch out for if you intend to use await in loops. Before you begin I'm going to assume you know how to use…

Asynchronous JavaScript has never been easy. For a while, we used callbacks. Then, we used promises. And now, we have asynchronous functions. Asynchronous functions make it easier to write asynchronous JavaScript, but it comes with its own set of gotchas that makes life hard for beginners. In this 2-part series…

When you create a package for others to use, you have to consider where your user will use your package. Will they use it in a browser-based environment (or frontend JavaScript)? Will they use it in Node (or backend JavaScript)? Or both? If you want to create a package that’s…