how to use rails format.json [closed]

Answer 1

1. It's used to return JSON.
2. No, it renders @cellphones as JSON. You may create a view, though, for example, using a JSON builder to customize the output beyond what Rails provides out of the box.
3. JavaScript is often used to make JSON Ajax requests, like for client-side frameworks.
4. Ajax calls often want JSON as a result. They may also request HTML to render directly.
5. That is an example of how to use it; make an Ajax request to /cellphones.