I am following sitecore first flow. Already installed jss in sitecore and also have deployed the sitecore jss react app from documentation. I am trying to pass the sitecore data as json to front end jss - react app. But the placeholders seem empty in json.
What are the steps to be done after deploying the sitecore jss app into my instance so that i can pass json data from my controller to be used by the front end jss.