JS Bin ^[1] is a web application which enables you to edit and test JavaScript and HTML. Once you have finished writing code, you can save it and send the URL to a friend for review or help. Further changes can be made to the code by your peers if required.

JS Bin supports syntax coloring, and the output of JavaScript and HTML can be viewed in the same window as a separate tab without having to open a new window or tab in your browser.

You can optionally include libraries like jQuery, jQuery UI, prototype, MooTools etc. There is no need of any extra software, and no registration is required to get started with JS Bin. It can be used to test code snippets and debug the code collaboratively. It’s free, light weight and easy-to-use.