not what he/she uses, but if you are interested in these kind of things, check out https://cables.gl/ https://cables.gl/ . it provides you with an in-browser,

not what he/she uses, but if you are interested in these kind of things, check out https://cables.gl/ https://cables.gl/ . it provides you with an in-browser, graphical, node based interface where you can just connect boxes together and it will output js-code ready to implement in your website. (disclosure: i know the dev plus am a huge fan!)