The new API will look pretty familiar too you, but there are a ton of changes though. To make the upgrade a little bit easier, here is everything you need to know:
### 1. Explicitly register the Document, Text and Paragraph extensions
Tiptap 1 tried to hide a few required extensions from you. Be sure to explicitly import the [Document](/api/extensions/document), [Paragraph](/api/extensions/paragraph) and [Text](/api/extensions/text) extensions.
```js
import Document from '@tiptap/extension-document'
import Paragraph from '@tiptap/extension-paragraph'
**We renamed the default `Document` type from `doc` to `document`.** To keep it like that, use your own implementation of the `Document` node or migrate the stored JSON to use the new name.
In case you’ve built some custom extensions for your project, you’ll need to rewrite them to fit the new API. No worries, though, you can keep a lot of your work though. The schema, commands, keys, inputRules, pasteRules all work like they did before. It’s just different how you register them.
Currently, blockquotes must not be nested anymore. That said, we’re working on bringing it back. If you use nested blockquotes in your app, don’t upgrade yet.