Download RunJS 2.3.1 / 2.4.0 Pre-release (Mac) Free

There are countless things you can do with JavaScript, but you don’t always have an editor to try out new ideas. Sure, there are plenty of online tools that do the job, but that means adding another tab to an already overused browser.

run JS is a very simple application with a single purpose – to provide you with an accessible way to write and test JavaScript code from your desktop. Although based on Electron and thus essentially a browser itself, this application is much more convenient than a web-based JS editor.

Write and run code now

The app’s interface is intentionally minimalistic and divided into two panels: one for writing code and one for viewing output. As expected, it has features like syntax highlighting and indentation, which make your job a lot easier.

By default, RunJS will evaluate your code as soon as you type, but you can disable this if you prefer to do it manually; in this case, a run Buttons have been added to the UI.

Extensive customization options

Visually, there are a lot of things that can be changed, from UI themes to fonts and text sizes. You can also specify whether to use line numbers or newlines, and how invisible characters should be handled.

In terms of functionality, you can install NPM packages from other JavaScript projects, change the working directory and toggle other advanced features such as loop protection and overall evaluation.

Simple code editor for working with JavaScript

RunJS is a great tool if you’re looking for a quick way to test and improve your JS code. From its minimalistic UI to the many ways it can be customized, the app is certainly impressive, and it makes it super easy to play with new ideas.