PJS meaning in Computing ?

Processing.js is a discontinued JavaScript port of Processing, a framework designed to write visualisations, images, and interactive content. It allows web browsers to display animations, visual applications, games and other graphical rich content without the need for a Java applet or Flash plugin.

Processing.js was originally created to allow existing Processing developers and existing code to work unmodified on web. Processing.js used JavaScript to render 2D and 3D content on the HTML canvas element, and was supported by browsers that have implemented this element (the latest versions of Mozilla Firefox, Opera, Internet Explorer, Safari and Google Chrome).

The development of Processing.js was started by John Resig and then picked up by the CDOT group at Seneca College after its initial release in 2008. A team of students and professors finished the porting work to get Processing.js to parity with the Processing v1.0 API, fixing more than 900 bugs, shipping 12 releases, and creating a vibrant community in the process. The project was run through a partnership between the Mozilla Foundation and Seneca College, led by David Humphrey, Al MacDonald, and Corban Brook.

Processing.js development was moved to GitHub in February of 2010, receiving contributions from 58 individuals, and was kept at parity with Processing up to its API version 2.1 release. The project was discontinued in December of 2018, two years after active development on it had stopped.

Lauren McCarthy created p5.js, a native JavaScript alternative and successor to Processing.js that has the official support of the Processing Foundation. McCarthy also teaches an introductory course to p5.js on Kadenze.