This demo shows how JSON:API links can be used to dynamically direct client-side actions and behaviors. Try it here.
index.html: this is the HTML scaffold in which the demo exists.server.js: this emulates a server providing a link, it reacts to any form state changes and updates the JSON:API link accordingly.client.js: this emulates a client-side component that parses and process the JSON:API link, it renders the buttons. It doesn't access the form, only the raw JSON.
Learn more about it in this blog post.