GroupDocs viewer for Node.js

Hi, I’m planning to use the GroupDocs Viewer Cloud api for Node.js on a React app.
The app has one frontend project (react) and one backend project (node.js and express).
From the documentation, it is my understanding that the viewer is implemented on the backend project.
How will the file be embedded on the front end ?
Do I need an iframe for the file that is passed from the api ?

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