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RunJS ❤️ JavaScript @RunJS_app

JavaScript news and development updates from RunJS, the JavaScript playground for your desktop.

Joined March 2019
  • Tweets 2,060
  • Following 799
  • Followers 4,177
73 Photos and videos
RunJS version 4 is out. Lots of new features and improvements. runjs.app/blog/whats-new-in-…

RunJS v4: Runtime Environments, Logpoints & Web View

RunJS v4 introduces dedicated runtime environments, a web view, logpoints, a new status bar, and a rebuilt output panel — along with upgraded Node.js, Chromium, and V8.

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The RunJS Black Friday sale is now on 🎁 - 30% OFF! runjs.app/buy

Buy License - RunJS

Buy a RunJS license and get unlimited access to all features, including NPM integration, multiple tabs, snippets, extra themes and more.

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RunJS ❤️ JavaScript retweeted
eden lane
@lane_en
21 Nov 2025
When I need to test some npm library or code snippet - I use @RunJS_app - it's so damn convenient! Looks like they have a black friday discount with a code: BLACKFRIDAY2025. Don't miss your chance!
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The latest version of RunJS is here, featuring expanded AI integration with new providers like Gemini, Ollama, Mistral, and Anthropic. Download it at runjs.app
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RunJS ❤️ JavaScript retweeted
Pier Gorelli@PGorelli91424
25 Jul 2025
Replying to @RunJS_app
@RunJS_app is the perfect study buddy — a fast, simple tool to experiment with JavaScript. No setup, instant results, just pure coding fun. #JavaScript #Coding
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What's Coming to JavaScript — The latest updates from the TC39 meeting reveal exciting proposals shaping the future of JavaScript. deno.com/blog/updates-from-t…

What's coming to JavaScript | Deno

Here are proposals that were advanced at the last TC39 meeting and what that means for the future of JavaScript.

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

JavaScript, when is this?

JavaScript’s “this” keyword trips up all developers — junior and senior. In the first of two parts, Mat Marquis goes deep on the groundwork you need to better understand “this” and how it works.

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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. runjs.app/ #JavaScript
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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. alexharri.com/blog/webgl-gra…

A flowing WebGL gradient, deconstructed

An introduction to writing WebGL shaders using gradient noise and cool math.

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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. hire.jonasgalvez.com.br/2025…

Fastify React is 7x Faster than Next.js

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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. saybackend.com/blog/04-deplo…
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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 developerway.com/posts/ssr-d…

SSR Deep Dive for React Developers

Explore step-by-step how Server-Side Rendering (SSR), pre-rendering, hydration, and Static Site Generation (SSG) work in React, their costs, performance impact, benefits, and trade-offs.

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RunJS ❤️ JavaScript retweeted
gab-o👨🏻‍💻@gaboesquivel
17 Mar 2025
Stumbled upon @RunJS_app while looking for a lightweight JS REPL for Mac, and wow—TypeScript, Babel, Node/browser APIs, local module imports, all in a clean, simple UI. Love it. runjs.app/

RunJS - JavaScript Playground for Your Desktop

Live results as you type. Built-in Node.js and browser environments, install npm packages, prototype UI live — no project, no setup, no signup. Mac, Windows, Linux.

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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. react.dev/blog/2025/02/14/su…

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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. benhowdle.im/migrating-js-to…

Migrating 160,000 Lines of Production Banking JavaScript to TypeScript with Zero Downtime - Ben...

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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. meiert.com/en/blog/javascrip…

Testing 10 JavaScript Frameworks on Their HTML Defaults · Jens Oliver Meiert

When you validate the demo and starter projects of popular frameworks like React, Vue, Angular, Svelte, Astro, &c., what do you find? On challenging the idea that JavaScript frameworks could fuel the...

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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. 2024.stateofreact.com/en-US

State of React 2024

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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. liveblocks.io/blog/which-ric…

Which rich text editor framework should you choose in 2025? | Liveblocks blog

Looking to integrate a WYSIWYG editor into your JavaScript app? This comparison dives into the best frameworks available, including Tiptap, Lexical, BlockNote, and Slate.

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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. humanwhocodes.com/blog/2025/…

Introducing Mentoss: The fetch mocker - Human Who Codes

A new approach to mocking global fetch() calls that works in both browsers and server-side runtimes.

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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. felixrieseberg.com/things-pe…

Things people get wrong about Electron

From $25,000 Bloomberg Terminals to SpaceX spaceship controls, web tech is powering systems you'd never expect. Many desktop apps are built with Electron. Why build with web tech — and why bundle...

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