What is about.js?

Grzegorz Dubiel

24-09-2025

Integrating LLMs into the web apps sometimes feels like organizing a discussion between the app and the LLM. Sometimes the program needs to ask for something in a loop, sometimes it needs to evaluate the LLM’s output, and often it serves as a mediator between the human and the LLM. The keyword for this is orchestration. To implement high-quality orchestration, we need robust abstractions. Let’s see why a graph is a good choice for this.

Grzegorz Dubiel

27-08-2025

One of the most exciting things for me in building software is scale. I enjoy challenges related to handling large amounts of data, dealing with various limitations, and processing information efficiently. In this article, I will focus on the Map-Reduce pattern, which, combined with parallelization, will help us summarize an entire blog by its post contents.

Grzegorz Dubiel

30-07-2025

These days, TypeScript is often the default choice when building web applications in the JavaScript ecosystem. Developers choose it for scalability, safety, and stability. But as we know, TypeScript doesn’t guarantee these benefits at runtime — Zod bridges that gap.

Grzegorz Dubiel

25-06-2025

Testing is one of the pillars of software development. The presentation layer plays a crucial role in user conversion and business success. However, testing the UI can be both challenging and frustrating. That’s why it’s important to have the right tools — not only to test inputs and outputs, but also to simulate user interactions and debug component behavior effectively.

Grzegorz Dubiel

28-05-2025

Modern client-side applications are large and often contain many similar UI elements, such as buttons, links, and lists. This is where React components truly shine. In this article, we'll explore patterns for creating reusable React components.

Grzegorz Dubiel

23-04-2025

There are many useful applications that orchestrate our workflow by managing multiple services. Sometimes, our job is to build such an application, and if so, it is good to know the patterns that allow for effortlessly linking multiple services.

Grzegorz Dubiel

27-03-2025

NestJS is an opinionated JavaScript backend framework that is rapidly gaining popularity. Let’s explore how to implement authentication and experience some of NestJS’s magic in action.

Grzegorz Dubiel

26-02-2025

Let's dive into the topic of GPT-4o-mini's context window and explore strategies and tools for managing it in JavaScript by building a keyword extractor capable of handling large amounts of text data.

Grzegorz Dubiel

22-01-2025

In the past, I had many opportunities to work on authentication systems. Everyone knows that when it comes to auth, cookies often need to be handled, and it's good to have tools that streamline working with them. One such tool is cookies-next, a tiny npm package designed (as its name suggests) to work with cookies in Next.js.

Grzegorz Dubiel

18-12-2024

Let's talk about Async Local Storage in Node.js. We'll explore where it can be used and its use cases. We'll also attempt to reimplement one of the features from one of the many popular meta-frameworks out there.