An application builder system includes an application builder server and a client-side application builder. The application builder server may receive, from a tenant user device, a request to store a data structure corresponding to a container component. The application builder server may identify one or more attributes of the data structure corresponding to a declarative use feature of the server. The application builder server may determine whether the data structure satisfies the declarative use feature of the server based on the attributes. The application builder server may expose the container component on the user interface based on the declarative use feature of the server. As such, a developer may upload a custom container component for use in an application builder application. Other users may download the custom container components and use the custom container component on the application builder application.