JavaScript

JavaScript’s default synchronous methods can freeze an application, scaring off end users. Here’s how you can leverage asynchronous JavaScript techniques to increase control over front-end responsiveness.

At first, JavaScript may seem quite simple. Yet the language is significantly more nuanced, powerful, and complex than one would initially be led to believe. Many of JavaScript's subtleties lead to a number of common problems—10 of which we discuss here—that keep code from behaving as intended. It's important to be aware of and avoid these pitfalls in one's quest to become a master JavaScript developer.

Considering you can include as much plain JavaScript as you like in your TypeScript project, what factors should you consider when choosing TypeScript for your application? Let's explore.

Maintainable Express.js code after scaling means making common code more feature-rich while reducing boilerplate. Find out how to enable promise-based route code and centralize both error handling and normal-results handling in Express.js apps.

Visual regression testing is not a new concept. Toptal engineers routinely use it, but with looming deadlines, they sometimes need to innovate and improvise. This article demonstrates how Toptal QA specialists leveraged UI testing and Cypress to run visual regression tests without resorting to specialized tools.

Our Express.js REST API series ends with a bang! Learn how to add a Dockerized MongoDB instance, Mongoose, JWT authentication, user permissions, and automated testing with Mocha, Chai, and SuperTest.

NgRx is a popular Angular state management library, but to unlock its full potential developers may require a few new skills. In this article, Toptal Full-stack Developer Luka Onikadze explains why he became an NgRx admirer after starting off as a skeptic.

The Express.js REST API journey continues! Move from models to full DAOs and DTOs, validate requests with middleware, separate services from controllers, and prepare for a real database.

WebAssembly gives near-native performance to web apps and allows languages other than JavaScript—plus their libraries—to be used on the web. This tutorial leverages Rust and the Web Audio API to make a basic guitar tuner app that runs at 60 FPS, even on mobile.