If you want to know what a piece of JS code will do, there's no substitute for just RUNning it and seeing the result! RunJS has become an essential tool in my daily JS development, writing, and teaching work, unseating a bunch of other tools like consoles, CLIs, and in-browser code editors.

All major cards are accepted, including Visa, MasterCard, Maestro, and American Express. You can also pay with PayPal, Apple Pay, and Google Pay.
After purchasing, you will receive an email with your license key. To activate RunJS, click on the 'Activate' button in the bottom right corner of the main window. This will open a modal window, enter your license key and click 'Activate'.
Yes, you can use your license on up to 2 devices at the same time. If you need to use it on more devices, you can deactivate it on one device and activate it on another.
Got questions or need support? Get in touch at mail@runjs.app