RunJS 4.0.4 for Mac
RunJS is a JavaScript and TypeScript programming environment designed for desktop computers that allows users to explore and experiment with both languages while providing instant feedback and visual results while coding.
This software simplifies the process of learning JavaScript by providing real-time feedback and a clear display of the results of each line of code. RunJS supports Node.js and browser APIs, including full access to the DOM, increasing flexibility.
It also has built-in support for Babel and TypeScript, allowing users to program with the latest syntax. RunJS also provides support for NPM packages, making it quick and easy to try out new libraries and frameworks. Its multiple tabs, autocomplete, code snippet collection, type checking, hover information, environment variable management, and other advanced features significantly improve programming efficiency and usability. RunJS also offers a variety of additional themes, such as Ayu, One Dark, Shades of Purple, and SynthWave ’84, to give users a personalized programming experience.
What RunJS is good for
- Instant feedback: evaluate code continuously while editing to see outputs and behavior immediately.
- Deep inspection: inspect values with workflows like Magic Comments and Logpoints so you can observe results without littering console.log everywhere.
- NPM experiments: install and try libraries quickly when you want to learn an API or compare approaches.
- Snippet workflow: build a personal snippet library for recurring patterns and teaching demos.
- Modern tooling: TypeScript-oriented workflows are supported via the product’s TypeScript playground direction (see official docs/pages for current capabilities).
- AI-assisted exploration: the product highlights generating and running code with AI assistance for faster iteration.
Main Features
- NPM packages : Try new libraries and frameworks
- Multi-tab : A must for multitasking
- Autocomplete : See code suggestions as you type
- Code Snippets : Create your own collection of code snippets
- Type checking : View type-related errors and warnings
- Hover Info : Quickly view type information and related documentation
- Environment variables : Easily store important data and access it from your code
- Additional themes : Ayu, One Dark, Shades of Purple, SynthWave ’84
- Exploring JavaScript has never been easier. Real-time feedback makes it crystal clear what your code is doing as you type along with each line of results.
- With RunJS, you have access to both Node.js and browser APIs, including full DOM access. This gives you a level of versatility that’s not possible in the standard REPL or Chrome console.
- Babel and TypeScript support enable you to write in a modern, up-to-date syntax.
- NPM packages for experimenting with new libraries and frameworks
- Multiple tabs are essential for multitasking
- Autocomplete: See code suggestions as you type
- Create your own collection of code snippets
- Type checking to see type-related errors and warnings
- Quickly view type information and related documentation on hover
- Environment variables can easily store important data and access it in code
- Additional themes: Ayu, One Dark, Shades of Purple, SynthWave ’84
Who uses it
Front-end engineers, instructors, and learners who want a clean, focused environment for small experiments—especially during screen shares, interviews, or daily “what does this do?” checks.
Version
- Version: 4.0.4
- Official site: runjs.app
Compatibility: macOS 10.15 and later, ARM
Homepage https://runjs.app/
Screenshots
