Free, open-source code editor by Microsoft with built-in Git, debugging, and a vast extension marketplace for every language.
Pricing: 0 USD · Updated 2026-09-03
developmentYes. Visual Studio Code is free and open-source under the MIT license (price checked 2026-09-03). AI features like Copilot are a separate paid add-on.
VS Code runs on Windows, macOS, and Linux, plus a browser version at vscode.dev.
Git explained: what version control is, how Git stores history as content-addressed snapshots, why branches are cheap, and how Git and GitHub fit together.
What an API is, how REST APIs work over HTTP, the methods you'll actually meet — GET, POST, PUT, PATCH, DELETE — and how to read a response.
JavaScript is the language of the web; TypeScript is a typed superset of it that compiles to JavaScript. Compare the trade-offs and learn when each one is the right tool.
A regular expression (regex or regexp) is a sequence of characters that forms a search pattern for matching and manipulating text. Built on a formal mathematical foundation and common to almost every programming language and tool, regex lets you validate input, find and replace text, extract data, and transform strings with a compact, declarative syntax. This guide explains what regex is, its core syntax, how it is implemented, and how to use it safely.
WebAssembly is a binary instruction format for a stack-based virtual machine — a portable compilation target that lets you run C, C++, Rust, and other compiled languages in the browser and beyond. Here's how it works and when it's worth using.
Code splitting divides a JavaScript bundle into smaller chunks that load on demand, speeding up initial page load. This guide explains the technique, the tools, and when it matters most.
Node.js errors come in several asynchronous styles, and each has its own correct way to be caught. This guide explains try/catch for synchronous code, error-first callbacks, promise rejection handling, and the 'error' event for streams and event emitters.
Web accessibility (a11y) means designing sites that anyone can use, regardless of ability. This guide explains the four WCAG principles — perceivable, operable, understandable, robust — and practical techniques: semantic HTML, keyboard navigation, alt text, and color contrast.
YAML (YAML Ain't Markup Language) is a human-readable data serialization format used for configuration files, CI/CD pipelines, and cross-language data exchange. This guide explains YAML syntax, key features, common tools, and security pitfalls.
Open source licenses decide how others can use, modify, and distribute your code. This guide explains permissive licenses (MIT, Apache 2.0), copyleft licenses (GPL, AGPL), and how to choose the right one for your project.
Bash is the default Unix shell on most Linux distributions and on macOS. Learn how Bash scripts work: variables, parameter expansion, conditionals, loops, functions, exit codes, and best practices for reliable, safe scripts.
Unit testing is the practice of testing the smallest testable parts of a program — functions, methods, or classes — in isolation. Learn what a unit test is, the arrange-act-assert structure, test doubles and mocking, the testing pyramid, and best practices for writing good unit tests.
Object-oriented programming is a paradigm based on objects that combine data and behavior. Learn the four pillars — encapsulation, inheritance, polymorphism, and abstraction — with practical examples and how they work in JavaScript, Java, and Python.
What is a cron job? Learn how cron and crontab work, the five-field schedule syntax with examples, common use cases, and modern alternatives like systemd timers and managed schedulers.
The JavaScript event loop is the runtime model that lets single-threaded JavaScript run asynchronous code. Learn how the call stack, the task queue, and the microtask queue cooperate, and why Promise callbacks fire before setTimeout.
HTML is the foundation of every web page. Learn what HyperText Markup Language is, how HTML elements and tags work, why semantic HTML matters for SEO and accessibility, and how HTML fits with CSS and JavaScript.
