JavaScript

Showing 1-9 of 148 results
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Visual Regression Testing with Cypress: A Pragmatic Approach

by Rafael Anachoreta

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.

7 minute readContinue Reading
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Building a Node.js/TypeScript REST API, Part 3: MongoDB, Authentication, and Automated Tests

by Marcos Henrique da Silva

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.

25+ minute readContinue Reading
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A Deep Dive Into NgRx Advantages and Features

by Luka Onikadze

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.

16 minute readContinue Reading
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Building a Node.js/TypeScript REST API, Part 2: Models, Middleware, and Services

by Marcos Henrique da Silva

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.

17 minute readContinue Reading
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WebAssembly/Rust Tutorial: Pitch-perfect Audio Processing

by Peter Suggate

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.

24 minute readContinue Reading
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The Definitive Guide to DateTime Manipulation

by Punit Jajodia

Time and date manipulation is notoriously difficult. Developers encountering time zone rules, leap seconds, differences in locale-specific formatting are wise to resort to popular time and date manipulation libraries. But without thinking about how exactly they work, it's still easy to create all sorts of obscure bugs.

23 minute readContinue Reading
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On-demand Reactivity in Vue 3

by Luka Mikec

The release of Vue 3 brought about substantial performance improvements, but they should not overshadow the introduction of new features and paradigms. In this article, Toptal Full-stack Developer Luka Mikec introduces you to the new Composition API and explains what Vue 3 means for code expressiveness, organization, and reuse.

16 minute readContinue Reading
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Building a Node.js/TypeScript REST API, Part 1: Express.js

by Marcos Henrique da Silva

Learn practical TypeScript patterns with interfaces and extended classes. Avoid messy console.log() statements with Winston and the Node.js debug module. Create an Express.js-powered REST API back end from scratch!

12 minute readContinue Reading
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Leveraging Declarative Programming to Create Maintainable Web Apps

by Peter Suggate

Adopting declarative-style programming techniques allows teams to create web applications that are easier to extend and maintain. In this article, Toptal Full-stack Developer Peter Suggate demonstrates how to leverage declarative programming and finite-state machines in JavaScript.

13 minute readContinue Reading

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