I have to transfer data from Wordpress website to custom CMS ( I don' t have access to database), and I need to transfer post data (title, excerpt, content) along with featured image link and category (preferably just category ID) if it' s possible using Wordpress API?

Thank you!

EDIT

I need someone who can make query for API e.g. example/v2/json/posts=-1&meta_key=all&featured_image=url