@rajashekard,
I am assuming that you are building a headless API with a page of /content/my-project/api/*. The Responsive Grid (from AEM Core WCM Components) gives you out of the box functionality that exports the page details and the list of components (configured on the page) when you visit the page with ".model.json".
Right, not to mention about the Adobe Core WCM Components, Page Component. When you create a page using a template that points to the Page Component, core component, then the ".model.json" will expose a JSON formatted representation of your AEM page.
