The usage and the concept of the Plone add-on 'plone.jsonapi.routes' will be shown in the web browser to the audience. This will encompass basic content retrieval, as well as create/update/delete operations. Afterwards, a modern JavaScript web application that communicates with Plone over the JSON API will be demonstrated. A small excursion to the JavaScript developer console provides some deeper insights into the asynchronous data retrieval. Finally, ways to extend `plone.jsonapi.routes` will be discussed.