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When you're working with any website, application, or API, you'll inevitably need to log in and authenticate your user base. One of the more commonly used methods of passing around authentication credentials from one system to another is using a JSON ...

If you've ever built a form in React and felt like the input fields had a mind of their own, you're not alone. One minute your form is working fine, the next you're staring at a blank input that won't update. Or React throws a warning like "A compone ...

As developers, we're always looking for more efficient tools. The MERN stack (MongoDB, Express.js, React, and Node.js) stands out for its JavaScript-centric nature, offering a unified language across the entire application. In this guide, you'll buil ...

On this week's episode of the podcast, freeCodeCamp founder Quincy Larson interviews Joe Hill. He's a software engineer who works on a data platform for NASA. Joe taught himself programming for 4 years while working as a janitor. As the single fath . ...

Building something from scratch using just PHP, MySQL, JavaScript, HTML, and CSS is one of the best ways to level up your skills and gain a real understanding of full-stack development. We just published a course on the freeCodeCamp.org YouTube chann ...

If your app runs in production, you'll need to know when it breaks. Preferably before your users tell you. That's where application monitoring tools (APM) come in. They show you what's working, what's slow, and what's failing, all in one place. Here ...

Most people know how to set goals. And many understand that developing good habits is key to reaching those goals. Yet, despite this knowledge, it's still easy to feel stuck - or worse, in motion without direction. We chase productivity without askin ...

JavaScript is an asynchronous programming language, which means it can handle multiple operations at the same time without blocking the main thread. When working with asynchronous operations like API calls, file reading, or database queries, you have ...

Learning how to fetch data from APIs is a must-have skill for any developer. Whether you're building a simple portfolio site or working on real-world applications, you'll often need to connect to external data sources. Being comfortable with API call ...

If you want to add some amazing and visually appealing animations to your web page, the View Transition API is a great animation tool. It lets you create Cross-Document Transitions when navigating between pages. And not just in classic multi-page app ...