RunJS is a desktop JavaScript playground.Get live feedback as you type 🚀 .Install NPM packages ⚡️.Access Node.js and Browser APIs 💻.Save snippets and build a snippet library 🧑‍💻.

What's Coming to JavaScript — The latest updates from the TC39 meeting reveal exciting proposals shaping the future of JavaScript.

JavaScript, When is this? — Mat Marquis explores the intricate nature of the "this" keyword, shedding light on its context-dependent behaviour in functions.

RunJS 3.1.0 is here. Including exciting new features and improvements, such as Magic Comments - a new way to instantly see the value of any expression anywhere in your code. #JavaScript

A Flowing WebGL Gradient, Deconstructed — This article offers a thorough introduction to writing WebGL shaders with gradient noise, breaking down the math and techniques involved in creating captivating visual effects.

Fastify + React shows impressive speed, being 7x faster than Next.js. With a mature Vite integration plugin, @fastify/react has reached version 1.0, simplifying the development of swift React applications on Fastify.

Deploying a Next.js App to Production in Any Server — This article provides updated guidance on building a Docker image for a Next.js application that allows for deployment without reliance on proprietary cloud services.

SSR Deep Dive for React Developers — This article provides a detailed exploration of Server-Side Rendering (SSR), pre-rendering, hydration, and Static Site Generation (SSG) in React, examining their costs, performance implications, benefits, and trade-offs.

RT @gaboesquivel: Stumbled upon @RunJS_app while looking for a lightweight JS REPL for Mac, and wow—TypeScript, Babel, Node/browser APIs, l….

React officially announces the sunsetting of Create React App, urging users to transition to modern frameworks such as Next.js or tools like Vite for their applications.

Ben Howdle explores the migration of 160,000 lines of production banking JavaScript to TypeScript without downtime. He shares insights into the motivation behind the project, the strategies employed, and the tools that eased the transition.

Testing 10 JavaScript Frameworks on Their HTML Defaults — The article examines how well popular JavaScript frameworks such as React, Vue, and Angular perform in generating valid HTML, challenging the notion that they contribute to an HTML crisis.

The State of React 2024 is now available, offering insights from nearly 8,000 responses. It highlights forwardRef and memo as major pain points, Redux's continued dominance in state management, and the persisting popularity of SPAs in React applications.

Which Rich Text Editor Framework Should You Choose in 2025? — A thorough comparison of popular WYSIWYG editors like Tiptap, Lexical, BlockNote, and Slate, exploring their features and suitability for JavaScript integrations.

Introducing Mentoss, a fetch mocker that offers an innovative way to mock global fetch() calls in both browser and server-side environments, building on concepts from tools like Nock and MSW.

Things People Get Wrong About Electron — This article explores the misconceptions surrounding Electron, highlighting its pervasive use in unexpected systems, from high-end financial terminals to spacecraft controls.

Why Did You Render: A tool that monkey patches React to help identify potentially avoidable re-renders. This can be particularly useful for optimizing performance in both React and React Native applications.

Running Animations Without Keyframes — A fresh approach allows for animations without keyframes, leveraging starting-style to set initial transition values, compatible with most browsers.

Node’s New Built-in Support for TypeScript — With the release of Node.js v23.6.0, TypeScript can now be used without any additional flags. The article discusses the implementation and potential caveats of this update:.

Five Tips to Effectively Optimize INP in React — This article shares expert insights into various techniques aimed at enhancing Core Web Vitals for React applications, with a particular emphasis on improving the Interaction to Next Paint (INP) metric.

A list of React starter kits (Vite, Next, Astro) which help developers to start a React project in 2024.